MONOCOTYLEDONS. 5 
(b) Leaves not plaited, rarely plaited but not 
divided. 6. 
5 (a) Perianth-segments 6. Ovules 1-7. Trees 
or shrubs. Leaves pinnately or palm- 
ately divided. Inflorescence spadiciform 
or paniculate, enclosed by a spathe. 
; Palmae. 
(6) Perianth-segments4,many,or none. Ovules 
numerous. Herbs or shrubs. Leaves 
palmate, 2-fid or 2-4-partite. In- 
florescence spadiciform with several 
spathes. Flowers moncecious ; male and 
female flowers upon the same spadix, 
alternating several times. Stamens 6 
or more. Ovary l-celled. Tropical 
America. Cyclanthaceae. 
6 (a) Inflorescence of the female or of all 
flowers a spadix. é. 
(6) Inflorescence no spadix. 10. 
7 (a) Ovaries several, distinct, nearly always 
enclosed by a perianth, rarely marine, 
grass-like plants with only 1 ovary. 
Water plants. Najadaceae. 
(b) Ovary 1. Land, marsh, or fresh-water 
plants. 8. 
8 (a) Flowers usually hermaphrodite or monceci- 
ous, in the latter case male and female 
