Arisaema triphyllum (Jack-in-the-pulpit, Bog onion, Brown dragon, Indian turnip, American wake robin, or Wild turnip) is a herbaceous perennial plant growing from a corm. It is a highly variable species typically growing from 30 to 65 cm in height with three parted leaves and flowers contained in a spadix that is covered by a hood. It is native to eastern North America, occurring in moist woodlands and thickets from Nova Scotia west to Minnesota, and south to southern Florida.
The leaves are trifoliate, with groups of three leaves growing together at the top of one long stem produced from a corm; each leaflet is 8–15 cm long and 3–7 cm broad. Plants are sometimes confused with Poison-ivy especially before the flowers appear or non-flowering plants. The inflorescences are shaped irregularly and grow to a length of up to 8 cm long. They are greenish-yellow or sometimes fully green with purple or brownish stripes. The spathe, known in this plant as "the pulpit" wraps around and covers over and contain a spadix ("Jack"), covered with tiny flowers of both sexes. The flowers are unisexual, in small plants most if not all the flowers are male, as plants age and grow larger the spadix produces more female flowers. This species flowers from April to June. It is pollinated by flies, which it attracts using heat and smell. The fruit are smooth, shiny green, 1 cm wide berries clustered on the thickened spadix. The fruits ripen in late summer and fall, turning a bright red color before the plants go dormant. Each berry produces 1 to 5 seeds typically, the seeds are white to light tan in color, rounded, often with flattened edges and a short sharp point at the top and a rounded bottom surface. If the seeds are freed from the berry they will germinate the next spring, producing a plant with a single rounded leaf. Seedlings need three or more years of growth before they become large enough to flower. In addition the plant is not self-pollinating since the male flowers on a specific plant have already matured and died before the female flowers of that same plant are mature. So the female flowers need to be pollinated by the male flowers of a different plant. This inhibits inbreeding and contributes to the health of the species.
It is hardy to USDA plant hardiness zone 3.
Chemical composition and medicinal uses 
The plant contains calcium oxalate crystals as raphides in all parts, and because of this consumption of the raw plant material results in a powerful burning sensation. It can cause irritation of the mouth and digestive system, and on rare occasions the swelling of the mouth and throat may be severe enough to affect breathing.
If the plant is properly dried or cooked it can be eaten as a root vegetable.
A preparation of the root was reported to have been used by Native Americans as a treatment for sore eyes. Preparations were also made to treat rheumatism, bronchitis, and snakebites, as well as to induce sterility.
History and folklore 
One account from the Meskwaki Indians states that they would chop the herb's corm and mix it with meat and leave the meat out for their enemies to find. The taste of the oxalate would not be detectable because of the flavored meat, but consuming the meat reportedly caused their enemies pain and death. They also used it to determine the fate of the sick by dropping a seed in a cup of stirred water; If the seed went around four times clockwise, the patient would recover, if it went around less than four times they would not.
Classification and relationships 
A. triphyllum is generally considered to be a single species with three subspecies. A. triphyllum subsp. stewardsonii and A. triphyllum subsp. pusillum are diploids, and A. triphyllum subsp. triphyllum is a tetraploid which originated as a hybrid of the first two. However, the three are reproductively isolated in the wild, which would argue for treating them as species. The main reason for considering them subspecies seems to be the difficulty in distinguishing them, especially based on herbarium specimens.
Within the genus Arisaema, A. triphyllum is classified in the section Pedatisecta and is most closely related to Asian species such as A. amurense.
- Arisaema triphyllum, Green Plant Swap
- "Jack in the Pulpit Wildflowers".
- "Jack in the Pulpit (Arisaema triphyllum) Julia M created the name and discovered this endangered plant for all to find". Archived from the original on 12 November 2007. Retrieved 2007-10-31.
- "Jack-in-the-pulpit". Retrieved 2007-10-31.
- The Arisaema triphyllum complex, based in part on Treiber, M., 1980. Biosystematics of the Arisaema triphyllum Complex. PhD Dissertation, University of North Carolina, Chapel Hill.
- 1. Arisaema triphyllum (Linnaeus) Schott, Flora of North America
- Renner, S. S.; Zhang, L.-B.; Murata, J. (2004). "A chloroplast phylogeny of Arisaema (Araceae) illustrates Tertiary floristic links between Asia, North America, and East Africa". American Journal of Botany 91 (6): 881. doi:10.3732/ajb.91.6.881.