(L.) Schott, 1832
Arisaema dracontium (dragon-root, green dragon) is a herbaceous perennial plant in the genus Arisaema and the family Araceae. It is native to North America from Quebec through Minnesota south through Florida and Texas, where it is found growing in damp woods. It has also been reported from northeastern Mexico (Nuevo León + Veracruz) Plants grow 20–50 centimetres (7.9–19.7 in) tall when in bloom and after flowering reach 100 centimetres (39 in), and each grows from a corm. Normally, a plant produces one leaf with a long petioles, its leaf is composed of 7 to 13 leaflets, with its central leaflet being the largest one and with leaflets becoming smaller as they are produced distally, the leaflets are held out horizontally over the plant. During flowering in spring, a single slender, green spathe 3–6 centimetres (1.2–2.4 in) long is produced; it covers a tapering, long thin spadix. The tail-like spadix grows out around the top of its spathe. After flowering, up to 150 berries are produced in a club-shaped column. In late summer, the green berries turn orange-red, each berry produces 1 to 3 seeds. It is listed as a vulnerable species in Canada.
Within the genus Arisaema, A. dracontium is classified in the section Tortuosa and is most closely related to the Mexican A. macrophyllum. In fact, A. macrophyllum has sometimes been considered a subspecies of A. dracontium. The rest of the section contains species from east Asia and India. A. dracontium is not a close relative to the other American Arisaema species, A. triphyllum (jack-in-the-pulpit), which is in a different section of Arisaema.
- "Arisaema dracontium (Linnaeus) Schott". Flora of North America.
- New Britton and Brown Illustrated Flora of the Northeastern United States and Adjacent Canada, p. 367. LCCN 63-16478
- Yang; Lovett-Doust, J; Lovett-Doust, L; et al. (1999). "Seed germination patterns in green dragon (Arisaema dracontium, Araceae)". American Journal of Botany. Botanical Society of America. 86 (8): 1160–7. doi:10.2307/2656980. JSTOR 2656980. PMID 10449396.
- 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. PMID 21653444.
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