a. Spadix or flower-cluster simple, on a long slender peduncle ascending from a lower axil or near the ground, unbra-nched, comprised of either 1 straight thin spike or of a few straight spikes standing finger-like at top of peduncle, the cluster lacking an elongated rachis or axis; spathe of I or 2 narrow sheaths on peduncle.
b. Spike 1 on the peduncle, strictly terminal.
c. Leaf-blade habitually entire (of one piece) although bilobed at apex or sometimes its base somewhat and irregularly split or pin- natisect into more or less separate parts: trunk very short, or little-noticeable above the ground.
d. Terminal lobes of leaf straight 1. G. DECURRENS
dd. Terminal lobes curved toward the top or falcate -2. G. OBOVATA
cc. Leaf-blade habitually pinnate, with distinct separate pair or pairs of pinnae (G. obovata is not to be sought here): trunk usually evident. d. Pinnae long (40-50 cm.), straight to apex, not tailed, often very narrow, strongly costate, gray-green: fruit large, 15 mm. or more long - 3. G. COSTATIFRONS
dd. Pinnae otherwise: fruit 12 mm. or less long.
e. Apex of pinna a very slender cauda or tail, and abruptly nar- rowed; pinnae short (25 cm. or less) - 4. G. ALLENII
ee. Apex of pinna curved or falcate, not caudate; pinnae 30 cm. or more long. f. Pairs of pinnae 1 or 2, with rachis below the terminal part vacant for 10 or 12 cm. - 5. G. CONDENSATA ff. Pairs of pinnae several or many and close together- - 6. G. PROCUMBENS
bb. Spikes few or several attached at apex of slender peduncle and radi- ating or spreading therefrom, the axis of the cluster very short or none ... . 7. G. SIMPLICIFRONS
aa. Spadix compound, with branches extending from a central, rachis, the peduncle short and spreading from the trunk in an upper axil; spathe cymba-like at base of stout peduncle.
b. Rachillae short, 10 cm. or less long, simple or once-forked.
c. Pinnae few., these and the terminal lobes 8-12 cm. broad, the tips caudate - - _. 8. G. CONGESTA
cc. Pinnae many pairs, 5 cm. or less broad, the tips acute or acumi- nate -------9. G. FERRUGINEA
bb. Rachillae slender, 20-30 cm. long, drooping in a much-branched very compound cluster: leaf-blade divaricately pinnate- 10. G. BINERVIA