Arisaema species T-Z are found on this page.
Arisaema taiwanense - presumably from Taiwan, this again is not my plant but one grown by Roy Herold and photographed at a NARGS plant meeting. The somber-hued spathe is wide open and looks more like a Dracunculus than an Arisaema. A gorgeous, heavy, mottled 'stem' makes this species a standout in the garden. Photo by Mark McDonough.
Arisaema ternatipartitum is from Japan. Photo by John Lonsdale.
Arisaema thunbergii ssp. thunbergii is a species from SW Japan and Korea. The adult plant can grow 50/60 cm tall and wide; the inflorescence appears when the leaves unfold; the spadix is rugose ending in a tail 20/30 cm long; and the peduncle is shorter than the petiole. Pictures of young plants in pots, grown and photographed by Giorgio Pozzi, April/May 2007. The last picture shows a closeup of the spathe with very large spadix origin.
Arisaema thunbergii ssp. urashima is in section flagellarisaema . Growing up to 60 cm tall, the flower appears when the single leaf begins to unfold. With 11/15 leaflets, this is another variety with a very long spadix. It comes from Japan (Hokkaido and Shikoku) and is grown and photographed by Giorgio Pozzi, April 2006. The first picture shows the emergence of the flower, note the purple spadix . The second shows the whole plant and the third the spathe.
The tubers planted in the wood are producing new small plants from offsets. Photo #1 taken April 2007; photo #2 taken May 2008 shows a great growth in the same spot with many new small plants near older tubers. Photos by Giorgio Pozzi.
Arisaema tortuosum is one of the best in the genus, being also the largest (up to 7 feet!--over 2 m.) and having a 'comical' dark spadix-appendix that first heads horizontal and then turns abruptly skyward!. Seems easy to grow, setting seed and offsetting well. This one is grown and photographed by Arnold Trachtenberg. The second and third pictures show the fruit, first green and then red as it ripens. Photo four by David Pilling is of seed unconnected with the first three photos.
Tubers from Ganesh Mani nursery (India), grown and photographed by Giorgio Pozzi, May 2006. The first picture is of the spathe and the leaves. This species is male or bisexual when mature; in the second picture the male flowers are visible just at the mouth of the spathe. The third picture shows a bisexual spadix of upper white male flowers and a green small ovary below. The last picture shows different sizes, stem colours, and patterns in cultivation.
Arisaema triphyllum is the well known "Jack in the pulpit", with wide distribution in North America. The plants may have different sizes and colors in the leaves and in the spathes. This was well described by Roy Herold, (Massachussets) who wrote: "I posted a description of the A. triphyllum that grow wild in the woods next my house. In an area perhaps 100 feet square, there is almost every variation in coloration you could imagine: spathes go from all green to white striped, to green on the outside and red on the inside, to nearly black all over; the spadix can be light green, green speckled with red or almost black; the stems too from green to dark red and leaves sometimes have red veins. A single plant can have any combination of these characteristics." The first two photos from Giorgio Pozzi taken April 2007 show some young plants from tubers received from the USA and grown in a pot with white and green spathes outside and purple inside. The flowering period in Europe is April. The second two photos were taken by John Lonsdale.
Below is the green form, with a closeup of the spathe by Giorgio Pozzi April 2007.
Arisaema utile is in section Arisaema , and grows wild in moist forests in Himalaya, India, Nepal and West China. It is up to 50 cm tall and wide, the spathe purple with marked white veins, appearing as the leaf unfolds, with a long and thick spadix. It flowers April to May. Photos 1-2 takn by Giorgio Pozzi, April 2006. Photos 3-4 from Paige Woodward.
Arisaema wattii , syn. A. auriculatum, syn. A. biauriculatum is in section Nepenthoidea . At 60/80 cm tall, it is smaller than A. nepenthoides, and differs by its 3-foliolate leaves and a more auriculate spathe. It grows in East India and West China, flowers from April to May. The spadix is either male or female, rare a bisexual form. Easy to grow, it needs light shade and well drained soil. This plant came from Chen nursery (CHINA) as A.147. The first three pictures were photographed by Giorgio Pozzi, March 2006. Two pictures show a back view. Note the marked auricles in the first picture and the stem in the last. The final picture was taken in 2007 and shows the variegated leaves and the whole plant.
Arisaema wilsonii This species is trifoliolate and the fruiting spike is 10-20 cm. long! The inflorescence is an attractive striped white/purple and the peduncle ("flower" stem) is held separately (dividing at ground level) from the petiole (leaf stem), so the fruits are very easy to see as they are held very high. The plant pictured below was purchased from Kaichen Nurseries as A-17. Photos by Bonaventure Magrys.
Arisaema yunnanense is a medium size plant in section Attenutata , from Yunnan (China). The green spathe is held above the trifoliate leaves and the spadix protrudes from the spathe-tube. It likes dry sunny conditions. Photos by Giorgio Pozzi, June 2006.