Flora of the Southeastern United States
2022 Edition


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Key to Arisaema

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1 Leaf with (5-) 7-15 leaflets, arranged pedately on a semicircular axis; spadix 9-20 cm long, attenuate, long-exserted from the spathe; [section Tortuosa]
1 Leaf with 3-5 leaflets, arranged palmately; spadix 3.5-8 cm long, clavate or cylindrical and blunt, included in the spathe; [section Pedatisecta].
..2 Leaves glaucous beneath at maturity; spathe flange 2-9 mm broad; spathe hood green, or green with purple stripes; sterile spadix (appendix) clavate or cylindrical.
....3 Leaves (3-) 5-foliolate (the lateral leaflets of at least the primary leaf 2-parted or 2-lobed); sterile spadix 1-3 mm in diameter, cylindrical, gently curved outward; spathe hood green, obtuse to abruptly acute; [s. NC and TN south to Panhandle FL, LA, and e. TX]
....3 Leaves 3-foliolate (the lateral leaflets undivided, rarely lobed); sterile spadix (appendix) 4-10 mm in diameter, cylindrical to clavate, straight; spathe hood green, or green striped with purple, long-acute; [NB west to se. MB, south to peninsular FL, LA, and e. TX]
..2 Leaves green beneath at maturity (very rarely glaucous); spathe flange 1-3 mm broad; spathe hood green with white stripes, green with purple stripes, solid green, or solid purple; sterile spadix (appendix) cylindrical.
......4 Spathe tube strongly fluted; spathe hood green with white or purple stripes; [northern south to sw. NC and e. TN]
......4 Spathe tube not fluted (rarely weakly fluted); spathe hood solid green or solid purple; [collectively widespread in our area].
........5 Plant to 1.2 m tall; spathe apex caudate to attenuate; {additional characters}; [e. GA south to s. peninsular FL]
........5 Plant to 0.2 (-0.4) m tall; spathe apex acute; {additional characters}; [widespread in our area, south to FL and LA]