Key A
Leaves palmately lobed or divided; leaf segments more than three or if three, then divided to the base.
la. Leaves 3-foliolate with the segments free to the base; plants terrestrial................ A. trisectum Sodiro
2a. Blade segments all free to the base. if not
3a. Plants huge, scandent, epiphytic; leaflets lobed; peduncle elongate; spadix to 75 cm long;
spathe dark violet-purple. ...... A. clavigerum Poepp.
- 3b. Plants relatively small, scandent, with long internodes; leaflets not lobed (except the basal leaflet); peduncle long or short; spadix less than 25 cm long; spathe green to purplish.
4a. Leaf segments all more or less equal, petiolules 4-6 cm long; peduncles slender and long, usually more than 20 cm long, longer than spadix; spadix whitish to greenish at anthesis. ..................... A. kunthii Poepp.
4b. Leaf segments unequal, the lowermost more or less auriculate and usually markedly inequilateral; petiolules usually short, less than 2 cm long with the leaf tissue decurrent, often almost to the base; peduncles short and stout, usually less than 6 cm long, usually shorter than the spadix; spadix lavender at anthesis. .................... A. pentaphyllum var. bombacifolium (Schott) Madison
2b. Blade segments united at the base; plants terrestrial or on rocks on steep slopes.
5a. Blade segments generally pinnatifid with 5-12 narrow divisions, the segments rarely entire but then subcoriaceous; the peduncle longer than the petioles. ................... A. podophyllum (Cham. & Schlecht.) Kunth
5b. Blade segments entire, the peduncle shorter than the petioles.6a. Blades evenly segmented. ................. A. pedatoradiatum Schott ssp. pedatoradiatum
6b. Blades unevenly divided, at least the median segment free or nearly so. .......... A. pedatoradiatum ssp. helleborifolium (Schott) Croat