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Arisaema
description selected species
 

A. amurense sect. Pedatisecta
The plant is about 50 cm high, and the leaves are divided in 5 leaflets.
The spathe-tube is green with white, more or less raised stripes, sometimes purplish tinged. The spathe-limb is green with few veins, now and then purplish tinged, and turns horizontal above the spadix. The spathe-tip is short and acute.
It blooms in April-June.
A. amurense
grows in Korea, Russia (S.E.Siberia) and N.E.China in moist forest areas. Earlier it was supposed that it was native in Japan too, but the newest litterateur denies that.
We have grown A. amurense in several years in our garden, without problems, including a very fine Korean form (from seed), with prickled leaves almost like a holly (without pricking), and the spathe is dark purple striped. It's the one you se at the photo.
 

Arisaema amurense Korea form

A. cancidissimum - sect. Franchetiana
This species is one of the best known. It's about 30-50 cm high, and there are 2 forms. A white, and a pink.
The leaf is divided in 3 leaflets, where the middle is the biggest.
The spathe-tube has white and green or pink stripes. The spathe-limb is upright or horizontal. The outside is whitish, and the inside either pure white or with pink stripes.
A. candidissimum
is one of the easiest to grow, and it is not so scrupulous about the soil. Besides it tolerate more sun than most Arisaemas, and it grows in moist shade as well as in sun. It propagates good by small tubers.
It emergence very late in spring or early summer, so late, that you often think it's dead. Is native to China (N.W.Yunnan and S.W.Sichuan) where it grows in rocky mountain slopes and in open pine-forest in an altitude of 2400-3400 meter.
 

Arisaema candidissimum

A. ciliatum - sect. Sinarisaema
The plant is up to 90 cm in height. The name "ciliatum" refers to some small hears on the margin of the spathe. But they are often so insignificant that you can't se them without a magnifying glass. The spathe is greenish or purple with white stripes. It sits under the leaves, and emergence when the leaf unfold. The spathe emergence on the side of the petiole a little under the leaf.
The spathe-limb ends up in a 10-20 cm long green or purple tail.
The spadix is green, the spadix-apendix is purple spotted.
The leaf is divided in 8-20 lanceolate leaflets, which spread out from the leaf-centre like an umbrella with beautiful arched green "spokes", often extended in a long thread-like tip. When the leaf unfolds the middle of the leaflets is vertical erect.
It propagate by offshoots, and sometimes it shoots 15-20 cm from the old plant. These offshoots is the easiest way to differ it from A. consanguineum, which it looks like.
Grows in light shade or shade and blooms in June-July.
Native to Sichuan, Nepal, Sikkim and S.W.China, where it grows in forests and shrubs in an altitude at 3200-3300 m.

Arisaema ciliatum var. liubaense

Grows in
Sichuan and Yunnan in China. The spathe is typical brownish purple to red-brown with cream stripes. The spadix is greenish, purple or now and then tinged with purple, and longer than by the species. The hears on the margin of the spathe-tube (which are on the species) don't exist here. The spathe-limb ends up in a 10-20 cm tail, green or purple.
If you run into seeds with the number CT368, CT369 and CT372, which is the numbers of the seed collection, it's all A. ciliatum var.
liubaense.
 

Arisaema ciliatum

 

A. consanguineum - sect. Sinaisaema
A quick growing species at about 180 cm.. The leaf is divided in 9-22 long radiated leaflets, which each ends up in a long thread-looking tip. The species is variable and the thread-looking tip can be longer or shorter or lack. The middle of the leaflets is vertical erect like A. ciliatum. Se the description at A. ciliatum to se the difference between the two species.
The petiole normally is brown spotted
, and the spathe is green (can vary with purple and brown), the spathe-limb turns horizontal over the spate-tube and ends in a very long – until 35 cm – thin tail. Spathe and leaf emergence at same time, the spathe sits on the petiole, and is hidden under the leaf.
A bunch of shining red fruits is seen late summer.
Distribution: Himalaya from Kumaon to Arunachal Pradesh, S.Tibet, Thailand, S.W.China and Taiwan in an altitude of  1800-2800 m.

A. consanguineum
var. kelung-insulare
is endemic in Taiwan and differs from the species by having two leaves against only one by the species. Addition it lacks the long thread-looking tip. The leaves are divided in 11-19 leaflets, and they are 12-30 cm long.
The spathe-tube and spathe-limb are green with white stripes, and the limb ends up in an only 5 cm long tail (against  35 cm by the species).
Grows between rocks in pine forests in a height of 1000-3000 m. A very beautiful and imposing plant. Before it was consider to be a separate species with the name A. kelung-insulare.
 

Arisaema consanguineum

Arisaema consanguineum

 

A. concinnum sect. Sinarisaema
The plant is up to 1,5 m with a green or reddish petiole, sometimes marbled or with brownish longitudinal stripes. Propagate by offshoots and seed. The one we have in our garden is quite new, while we at the moment don't know how much it propagate.
By the most it only gets one leaf, and it is divided in many (until 13) lanceolate leaflets, looking like an umbrella.
The spathe is hitten under the leaf.
The spathe-tube is green or purple striped with white, while the spathe-limb is a little darker. The limb
turns horizontal over the spate-tube and ends in 10-15 cm long tip.
A. concinnum
grows in Himachal Pradesh and India through Tibet to W.China and the northern Myanmar.
It grows in an altitude from 1700 to 3600 m, in forest meadows and open slopes. It blooms in May-June.

Arisaema concinnum
A. costatum - sect. Arisaema
The leaf has three leaflets with conspicuous parallel veins and reddish margins.
In the newest literature is mentioned that it only gets one leaf, but the one we have in the garden has two, so that's possible too.
The plant has a dark purple and white striped spathe, and the spathe-limb, which ends up in an about two centimetre long tip, turns horizontal over the spathe-tube. The spadix ends up in an extraordinary long, thin, twisted tail at 15-45 cm. The petiole is greenish. The plant is 35-50 cm in height, and it blooms in June-July. The spathe is hidden under the leaf, and emergence from the ground (and not as for example A. consanguineum where it emergence from the side of the petiole).
Grows from C.Nepal to E.Nepal in an altitude of 2000-2600 meter. Is also found in Sikkim and S.W.China.
 

Arisaema costatum

A. dilatatum sect. Arisaema
This plant, who reach a height of 45 cm, is close related to A. wilsonii.
The petiole is clear green or purple, often with light spots. The leaf (mostly only one) is green, sometimes with purple spots, and the margin is undulated with yellow or reddish edge. The underside has raised veins.
The spathe is hidden under the leaf. The spathe-tube is green or dark purple with lighter stripes, the margin bend outwards.
The spathe-limb is green, purple or green with purple, and ends up in a short tip.
The spadix, which juts out of the spathe, is up to 25 cm long and ends up in a tip.
At the photo you see the plant from our garden (flowering at first time in 2005). The ends of the spadix and the spathe-limb are not very acute. On the other hand the hole spathe including the spadix is very dark. But it's not typical for the species.
The blooming happens in April-May and the plant is native to Bhutan and V.China, where it grows  in forest meadows in an altitude of 2000-4000 meter.
 

Arisaema dilatatum

A. elephas sect. Arisaema
This species is among other collected by the AGS-expedition in China in 1996, and is one of the most remarkable.
The plant gets to a height of  40 cm, the petiole is green or purple with red veins.
The leaf has 3 leaflets. It is green, tinged with purple, and has red margin. The middle of the leaflets is the shortest. The spadix is very long, dark purple-black, it turns forward and upwards and ends in a long tail.
The spathe is hidden under the leaf, it's red-purple with conspicuous white stripes and a forward turned spathe-limb.
Grows in forest of pine, bamboo and rhododendron, between moss-covered rocks in Bhutan, Sikkim, Nepal, Tibet and Yunnan. Grows in an altitude of 1800 to 4000 meter. Flowers in May.

A. elephas
var. handelii
Grows in Sikkim, Nepal and S.W.China in a height of 2800-3500 meter.
It was earlier considered to be a species (A. handelii).
The spathe-tube is light or dark purple with white stripes. The spathe-limb is yellowish-green or purple and turns upwards. The spadix is yellowish-green end ends up in a long, light purple, tail. Grows in mountain forests.
 

Arisaema elephas

A. engleri sect. Pedatisecta.  
In the literature it's named to be 80 cm high. The one we have in the garden, is not so high. Only about 30 cm.  
It gets two leaves, each divided in 5-7 green leaflets, where the middle is the biggest.  
The spathe, which sits above the leaves, emergence at the same time as the leaves.  
The spathe-tube and the spathe-limb both are purple with white stripes, and the limb is turned forwards over the spathe-tube.  

It's also found under the names
A. sikokianum var. serratum, A. sikokianum var. henryanum and A. sazensoo var. henryanum, but A. sikokianum and A. sazensoo are endemic in Japan and has nothing to do with A. engleri.  

Grows in mountain forest in an altitude of 700-2000 m, and is native to E.China. 
A. engleri is one of the earliest flowering in the genus, often already in April or the first half of May.
 

Arisaema engleri

A. erubescens – sect. Sinarisaema  
The plant gets a height of 80 cm. The hole plant, except the dark green leaves, looks reddish or red-brown. The leaf has 7-14 leaflets. The thread-looking tip, which is seen by A. consaguineum, lacks here, or else the two species looks like each other. Some species has marbled leaves.
The petiole is brownish, and get on with growing after the flowering, so it gets higher than the spathe. The spathe emergence, from the side of the petiole
The spathe has a variegated colour - purple - pink or brownish, in all cases with white stripes. It sits above the leaf, at least in emergence. The spathe-limb turns horizontal over the spathe-tube. The spadix is pink with a yellowish green tip.
It is native to India, Myanmar, C.Nepal, Sikkim and China where it is widespread. It grows in temperate forests and thicket in an altitude of 1400-3200 m. It's also found in open rocky areas and clearings. Flowers in May-June.
 
A. fargesii sect. Franchetiana
A very beautiful species, which have shiny 3-lobed leaves, more or less overlapped at base. The one in the middle is the biggest.
The spathe is red-purple with white and green stripes. The spathe is hidden under the leaves.
The purple-brown spathe-limb has white veins, and it turns down over the purple-brown spadix, and ends up in a 3-4 cm long tail.
The plant is about 60 cm in height and flowers in June-July.
Grows in thickets in open sunny areas. Other places it's mentioned, that it's best in shade with a good drainage. In our garden we have placed it in shade, and it's growing fine. Needs a lot of water in the growing season (which is a general demand for the genus).
Native to Sikkim, Nepal and S.W.China, where it grows in a height of 900-1600 meter.
 

Arisaema fargesii

A. flavum subsp. flavum  – sect. Docrafo
Grows to a height of 75 cm. The leaf has up to 11 leaflets.
The spathe-tube is green with yellowish stripes. The spathe-tube is narrow in the upper part, and then again turns outwards like a collar. The spathe-limb is yellow, upright and longer than the spathe-tube. The spadix is bisexual. It flowers in June.
A. flavum
is vide distributed and is native to S.W.China, Afghanistan, Bhutan, India, Nepal, Ethiopian, Yemen, Oman and Saudi Arabia. It grows in an altitude of 1400-1850 meter.

A. flavum subsp. abbreviatum
Is
t
he most common in culture. It gets up to 70 cm in height, but there is low forms too. The leaflets are broader than A.flavum subsp.flavum, the middle of the leaflets is the biggest.
The spathe is one of the smallest in the genus, but looks almost as A.flavum subsp. flavum, except the spathe-limb which is shorter, and inside at base the limb is purple.
Is native to Oman and the Himalaya-area, where it grows in open forests and dry rocky areas in an altitude of 1800-4500 meter.

A. flavum
subsp. tibeticum  
Is about 45 cm high, and it is the lowest of the three.
The leaf is broad lanceolate, but scarcely as broad as A. flavum subsp. abbreviatum. The spathe emergence before the leaf. It is light yellow. The spathe-limb is much longer than the spathe-tube, upright and the inside almost colourless with purple spots. Native to Arunachal Pradesh, Bhutan, Tibet, Sichuan and Yunnan. It grows in 1500-4000 meter in very dry areas.
 

Arisaema flavum var. abbreviatum

A. franchetianum sect. Franchetiana
The plant gets a height up to 90 cm.
The leaf has 3 leaflets. The leaflets are blue-green, and the one in the middle is the biggest.
The spathe-tube is dark purple with white stripes, and the mouth-margin turns outwards like a collar.
The spathe-limb is dark purple with white stripes too. It ends in a 15-20 cm long dark purple tail, which change colour to light green in the end of the tip. The spathe-limb turns forward over the spadix, and there is only a little hole, where the spadix sticks out.
The flowering is in May-June.
Native to S.W.China, N.E.India (Arunachal) and Myanmar, where it grows in sunny areas between rocks and in thicket. 900-3000 m.
 

Arisaema franchetianum

A. galeatum – sect. Arisaema  
The tuber is ovate, sometimes very big, and weighting more than half a kilo
.
A. galeatum goes up to 140 cm in height. The petiole is purple marbled.
The leaf has three leaflets. The spathe is formed like a helmet and looks like A. ringens.
The spathe is purple-brown or green-purple with white stripes. The spathe-limb is shorter than the spathe-tube, outside green and inside purple. The tip is compressed, 3-5 cm long, inside yellow-green and outside purple.
The spadix has a 30-50 cm long tail, white tinged with pink . Flowers in Marts-April.
Widespread in E.Himalaya from Sikkim and Darjeeling through Bhutan, Mishmi Hills, Arunachal Pradesh to N.Myanmar, where it grows in an altitude of 1300-2500 m. Prefer shade, deep humus and is often found in the forest floor in temperate areas.
 

Arisaema galeatum

A. griffithii - sect. Arisaema
Is a very conspicuous species with a big, broad, rounded, dark purple, ear-looking spathe with a tissue of green veins.
It looks a lot like a cobra, which have giving it the name "Cobralily". It is very variable.
The spathe-limb is 10-15 cm broad and  ends in a 1-4 cm long tip. The spadix ends in a 20-60 cm long tail. The leaf is divided in three, and the leaflets are curled in the margin. The plant gets a height of 15-60 cm. Flowers in May.
Is native to C. Nepal, Sikkim, Darjeeling and Bhutan, where it grows in an altitude of 2400-3900 m, in rhododendron forests, open thickets and alpine meadows.
In Sikkim, in about 3000 meter, there is a variety  which differs from the species by a bigger and more open spathe, purple-brown/cream-white, and a spadix with a limb up to 50 cm. It's named
A. griffithii var. pradhani, and it grows in open mountain areas together with Primula denticulata in the periphery of rhododendron forests.
Arisaema griffithii

Arisaema griffithii var.pradhanii

A. jaquemontii - sect. Tenuipistillata
Is native to Afghanistan, Nepal, Sikkim, Darjeeling, Bhutan to Arunachal Pradesh and S.E. Tibet.
The leaf is clear green.
The spathe rise just above the leaves, and has the same green colour, but with white stripes, and the spathe-limb ends up in a 3-12 cm long, upright tail.
The spadix ends in a 2-8 cm long purple or green tail.
The plant gets one or two leaves, which is divided in 5-9 leaflets with fine marked veins. The one in the middle is the biggest.
It's an easy species to grow, it thrives well and spreads good in Danish gardens, and it's good to set seed. Flowers in June-August.
Grows in open forests, thickets and meadow slopes in an altitude of 2400-4000 m.
The plant gets up to 80 cm in height.
 

Arisaema jaquemontii

A. kiushianum sect. Flagellarisaema
The leaf has 7-13 leaflets, the petiole is green, and the plant is about 40 cm high.
The spathe emergence besides the petiole in May or June. It's purple with white stripes. At the head of the mouth the spathe-tube is outwards bent, and it's dark purple with green stripes.
The spathe-limb, which is forward bent, almost covers the spadix. The spathe-limb is, on the outside moss-green, on the inside dark purple with white stripes, and with a dramatic T-mark engraved.
The long tail-looking spadix (up to 15 cm) juts out from the spathe and is a bait for insects.
Is native to Japan, where it grows in open forests.
 

Arisaema kiushianum

A. nepenthoides – sect. Nepenthoidea  
Is a remarkable species, where the hole plant, from the petiole to the spadix, but except the leaves, is distinct marbled in green-brown, red-brown or dark brown colours.
The shining, deep green leaves (2 or 3) has mostly 5 leaflets. 3 or 7 can happen.
The spathe sits above the leaves and emergence from the side of the petiole under the leaf.
The spathe-tube is yellow-green with dark brown spots and lines. By the crossing between spathe-tube and spathe-limb sits, on each side, an excrescence, which almost looks like a couple of big ears. This, together with the special colours, makes it easy to know. Only A. wattii looks like it, but by this species the leaf always has three leaflets.
The "big ears" vary in size from small curls to big flaps.
The spathe-limb has, on the outside, the same colour and spots as the spathe-tube. The inside is yellow-green with light green veins. The spathe-limb turns forward and down over the light purple and spotted spadix. Gets a height of 1 m, and flowers in May.
Grows in forests, thickets, and now and then along rivers. Is native from Nepal in the east, through Sikkim, Bhutan, Darjeeling, Khasia Hills, N. Myanmar to W. China, where it grows in a height of 2300-3300 m.
 

Arisaema nepenthoides

A. propinquum - sect. Arisaema
The plant gets a height of 80 cm. It is native to Pakistan, Kashmir, Sikkim, Bhutan, Nepal, India and S.W. Tibet. Because of the big area of distribution the plant is very varied. A characteristic trait is however the white longitudinal stripes in the green spathe. It looks a great deal as A. griffithii, and the one we have is just bought in England some years ago as A. griffithii.
The spathe emergence directly from the ground, and it emergence before the leaves.
The leaf has three leaflets, and they have the fine undulate margin, which is seen by a lot of Arisaema.
The spathe-tube is dark purple or green with white stripes, and inside with raised veins.
The spathe-limb is dark purple or green with purple spots, green longitudinal stripes in the middle part, and a green margin with veined tissue. The spathe-limb ends in a narrow, short or long, tip.
The spadix is green at base and change gradually to purple outwards to the tip.
It grows in rhododendron forests, thickets, open slopes and alpine meadows between low scrubs, in an altitude of 2.400 - 4.200 m. Flowers in May-June.
 

Arisaema propinguum

Arisaema ringens - sect. Pedatisecta
In the newest literature A. ringens is told to be 110 cm in height. Other place is named a height of 30 cm, and that suits mush better to the plant in our garden.
The leaf has three leaflets and ends in an, up to 3 or 4 cm, long tip.
The spathe is formed like a helmet. The spathe-tube is either green with white stripes or purple with white stripes. The upper part of the spathe-tube is outwards turned and looks almost like an ear. The spathe-limb is outside green, and inside green or purple with white stripes. It is, like the upper part of the spathe-tube, curled, and it turns horizontal over the white spadix. 
It flowers in May. A. ringens almost newer sets seed.

It is native to Japan, Korea, E. China and Taiwan, where it grows in forest clearings and cost areas.
 

Arisaema ringens

A. serratum - sect. Pedatisecta
Is a very variable species, and there is a lot of named varieties in circulation, which all are considered to be synonyms.
The petiole is marbled. The leaf has 7-17 elliptic to lanceolate clear green leaflets, each is 5-12 cm long. The spathe is hood-shaped, and 8-12 cm long. The spathe-tube is green or purple with white stripes. The spathe-limb is greenish or purple too, and turns down over the spadix, which is light green or reddish.
The plant grows to a height of 1 m, and it flowers in April-June.
Is native to China, Korea, and Japan, where it for instance grows in shady cryptomeria forests in an altitude of 2800 meter.
 

Arisaema serratum

A. sikokianum - sect. Pedatisecta
This wonderful Japanese species is one of the most beautiful among the genus. It is said to be short living, so remember to collect the seeds. The literature names it to be 70 cm in height, which maybe is a little too much in Danish gardens (our own is about 30-40 cm.).
A. sikokianum
has two three-lobed leaves, clearly green and sometimes with white drawings in form of lines and spots.
The spathe is placed above the leaves.
The spathe-tube is black-purple with white longitudinal lines at the outside, and white at the inside. That gives it the characteristic white "mouth", where the white club-looking spathe sticks out.
The spathe-limb is upright, and ends in an extended tip. It is black-purple outside and greenish with white lines inside, and narrow at base.
In all a very characteristic appearance, which makes it easy to know. Flowers in April-May. Is native to the Japanese island Shikoku, where it grows in forests
 

Arisaema sikokianum

A. speciosum - sect. Arisaema
A. speciosum has a big, very beautiful three-lobed leaf with conspicuous veins, and a reddish margin. The outer leaflets are curved, so they adjusts the form of the middle one.
The spathe, which's sitting under the leaf, is 10-15 cm long, purple with white stripes. The spathe emergence from the petiole a few cm above the ground.
The spathe-tube is purple-brown or light purple with white stripes. The mouth (the upper part of the spathe-tube) is white with purple margin.
The spathe-limb, which is purple, turns horizontal over the spadix, and ends in a tip.
The spadix is purple-yellow or white, and ends in a long threat-looking tail at about 80 cm.
Flowers in April-May.
Is native to Nepal, Darjeeling, Sikkim, Bhutan, Arunachal and W. China, where it grows in an altitude of 2000-3500 m.
Grows in thickets, forest margins and slopes.
The tuber is very big and turnip-looking. The roots shoots from the upper part. We always take the tuber inside in winter, because it easy rots in the wet Danish winter.

A. speciosum
var. mirabile
Differs from the species by later flowering, and besides that, the lowest part of the spadix is thicker and often reddish. The spadix-apendix is red or green and ends up in an up to 125 cm long tail. Flowers in June-July.
Native to Nepal, Sikkim and Bhutan, where it grows in an altitude of  2300-3300 m.
A. speciosum ’Ziro’
The petiole is more marbled than by the species. The spathe is thinner and the spadix-apendix is green or reddish in the middle, and ends in a black-purple tail, which only a little longer than the spathe-apex.
Grows in forests margin and thickets in Arunachal in a height of 1500 meter.
 

Arisaema speciosum

Arisaema speciosum leaf

 

A. thunbergii - sect. Flagellarisaema
Is a conspicuous Japanese species, which grow to a height of 60 cm. The leaf has 9-21 leaflets, the upper side shiny dark green, and the underside purplish.
The spathe-tube is purple with white stripes and dark purple spots. At the upper part, at the mouth, it is dark purple and outwards turned.
The spathe-limb is broad, forward turned, purple, and ends in a tail-looking tip.
The spadix is white, changing to dark purple towards the tip, and ends in a 20-50 cm long tail.
Is native to the S.V. Japan and Korea.
Grows in low altitudes in forest areas.
Flowers in April-May.

A. thunbergii
subsp. autumnale
Differs from the species in height (subsp. automnale 70 cm), and it flowers in August. The leaves are often green until February.  Besides that the leaf has fewer leaflets than the species.
The spathe-limb is green- and purple striped outside, and inside dark purple with white stripes.
The spadix is dark purple.
Native to N.and E. Taiwan, where it grows in forests in low altitudes.

A. thunbergii subsp. urashima
Gets about 60 cm in height.
The spathe-tube is whitish with purple spots. The mouth margin is outward turned and makes a collar.
The spathe-limb is greenish with purple spots at the outside, and black-purple at the inside.
The spadix is dark purple and ends in a dark purple 40-60 cm long tail.
The leaf has 11-15 leaflets, the one in the middle is the biggest.
Flowers in April-May. Native to Japan, where it grows in forests in low altitude.
There is different forms in culture, and they varies in the colour of the spathe, and the length of the spadix-apendix (tail). The most normally has a whitish spathe-tube with a much darker spathe-limb, and a very long tail.
A.thunbergii subsp. urashima alba - with green-white flower.
 

Arisaema thungergii subsp. urashima

A. tortuosum - sect. Tortuosa
This species is native to a very large area, which stretch out from S.India, Kashmir, Himalaya, Bhutan, N.Myanmar to W.China.
In the reason of this large geographic spreading, it is very variable, and it can be interesting to grow plants from different areas to study the variations.
For example a form from Nepal can reach a height of 2 m, and is then the tallest in the genus.
The plant often consider not to be so hardy, probably because some of the tuber, which is available, comes from lower altitudes. But you can also find more hardy tubers in the trade. It's a good idea to plant the tuber deep, so it's protected by frost.
The plant is about 50 cm high, and the petiole is green or purple, now and then marbled or spotted.
It gets 1 to 3 leaves which is divided in 5-23 leaflets, the one in the middle is the longest.
The spathe sits above the leaves.
The spathe-tube is green outside and white pigmented inside.
The spathe-limb is green, and shorter than the spathe-tube, the tip is short and insignificant curved.
A remarkable long light green spadix, often purple tinged, and about 25 cm long including the tail, sticks up above the spathe.
It flowers in April-July. Grows in forest in moist, shady places in an altitude of 600-3900 meter.
 

Arisaema tortuosum

A. triphyllum - sect. Pedatisecta
Is a very hardy and variable species. The petiole is green or purple. The one or two leaves are three-lobed, green, at the underside red veined .
The spathe-tube is mostly green with white stripes, but can also be purple with white stripes, or almost black, or all shades among this.
The spathe-limb is shorter than the spathe-tube, and mostly has the same colours and shades as the spathe-tube. But the spathe-tube and the spathe-limb doesn't always have the same colour. For example the spathe-limb can be darker than the spathe-tube, or the tube darker than the limb. The apex of the spathe-limb is mostly tinged with purple.
The spadix is either light green, green with purple spots or pure purple.
The spathe is placed below the leaves.
The plant grows to a height of 30-70 cm, and flowers sin May. Is native to the eastern USA and S.Canada. It grows in moist soil in deciduous forests.
There are some plants in culture, named as for instance
’Zebrinum’, ’Stripes’, ’Mrs. French’, ’Pinto’ a.s.o. As well as known all unofficial, but normally used.
By ’Zebrinum’ the inside of the spathe-limb is dark purple with white stripes. The spadix is dark purple too. ’Mrs. French’ has light veined leaves.

A. triphyllum
subsp. pusillum
Gets a height of 30 cm. The underside of the leaf is shiny green. There is no stripes at the spathe-limb, which is clear green or purple. Is native to the southeast USA. Flowers in May.
A. triphyllum subsp. stewardsonii
The leaf has, like A. thiphyllum subsp. pusillum a shiny underside. It gets a height between the two others, and is easy to know from the typical A. triphyllum by the conspicuous white longitudinal stripes on the spathe-tube. The spathe-limb is striped with white or purple lines.
An elegant plant, which's native to the northeast USA and Canada. Flowers in May-July.
Arisaema triphyllum
Arisaema triphyllum 'Zebrinum'
Arisaema triphyllum subsp. pusillum
Arisaema triphyllum subsp. stewardsonii
A. utile -  sect. Arisaema
A species from the central Himalaya with big three-lobed leaves – one of the most remarkable species in the genus. It grows to a height of 50 cm. The spathe-tube is purple or red-purple with white stripes.
The spathe-limb is about 15 cm long. The colour is intense red-purple and silk-looking on the outside, and the inside has a tissue with light veins.. The spathe-limb ends up in a 2-3 cm long tip. The spate is sitting under the leaves.
The spadix is dark purple and ends up in an 20 cm long tail.
The leaves are big, and has 3 leaflets, green on the upper side and with purple prominent veins at the underside.
A real remarkable species what concerns to both the spathe and the leaves. Is real worth to grow in the garden.
It flowers in May.
Needs a good drainage. Grows in moist areas in the periphery of rhododendron forest among moss-covered rocks in Himachal Pradesh, Nepal, Sikkim and Bhutan in an altitude of 2500-4300 meter
 

Arisaema utile

A. wilsonii - sect. Arisaema
Was earlier considered to be a synonym of A. elephas, but is now an independent species. It is closely related to A. dilatatum and A. asperatum, and some considers that is it the same species. A. wilsonii is the highest of the three.
We have them all in the garden, and must agree that they look like each other. For instance the leaves are identical, and at the spathes there is not much difference.  
A. wilsonii is about 130 cm in height. 
The leaf has 3 leaflets
, sometimes with purple spots. The underside has raised veins, the margin is undulated with red or yellow edge.
The spathe-tube is purple, greenish or mixed purple and green. In all cases with white raised stripes.
The spathe-limb is either clear purple, green or green tinged with purple.
The spadix ends up in a 15-25 cm long purple, light green or whitish  tail.
The spathe is below the leaves.
Flowers in May.
Is native to Sichuan, Yunnan, Gansu and Tibet. Grows in mountain areas, often together with Rhododendron, in an altitude of 1800-3200 meter.
 

Arisaema wilsonii