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FNA | Family List | FNA Vol. 22 | Araceae | Arisaema

1. Arisaema triphyllum (Linnaeus) Schott in H. W. Schott and S. L. Endlicher, Meletemata Botanica. 17. 1832.

Jack-in-the-pulpit, Jack-in-the-pulpit, IIndian-turnip, petit-prêcheur

Arum triphyllum Linnaeus, Sp. Pl. 2: 965. 1753; Arisaema acuminatum Small; A. atrorubens (Aiton) Blume; A. polymorphum (Buckley) Chapman; A. pusillum (Peck) Nash; A. quinatum (Nuttall) Schott; A. stewardsonii Britton; A. triphyllum subsp. pusillum (Peck) Huttleston; A. triphyllum subsp. quinatum (Nuttall) Huttleston; A. triphyllum subsp. stewardsonii (Britton) Huttleston; A. triphyllum var. pusillum Peck; A. triphyllum var. stewardsonii (Britton) Stevens ex Wiegand & Eames

Although these morphological forms may be recognizable in the field, distinguishing these differences in herbarium specimens is often difficult, and there is much overlap occurs in expression of the characteristics supposedly defining infraspecific taxa. Numerous intermediate forms exist, including putative hybrid populations be tween the subspecies with 2n = 42 (D. G. Huttleston 1949, 1953). Given these problems and the sympatric ranges of the "subspecies" recognized by previous workers, A. triphyllum is treated here as one highly variable species.

In addition to the above variability within the Arisaema triphyllum complex, putative hybrid populations between A. triphyllum and A. dracontium also occur naturally (L. L. Sanders and C. J. Burk 1992). These plants do not produce mature fruits but do reproduce vegetatively.

1 (1) Leaves glaucous beneath at maturity; spathe flange 4.5--9 mm wide; spathe hood green or green with purple stripes; sterile spadix appendage club-shaped, rarely cylindrical; stomatal guard cell length mostly greater than 40 µm   subsp. triphyllum
+ Leaves polished or lustrous beneath, not glaucous; spathe flange 1--3 mm wide; sterile spadix appendage cylindrical, rarely club-shaped; stomatal guard cell length mostly less than 40 µm.   (2)
2 (2) Spathe tube strongly fluted; spathe hood green with white or purple stripe.   subsp. stewardsonii
+ Spathe tube not fluted or rarely weakly fluted; spathe hood green or purple.   subsp. pusillum


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