MONOCOTYLEDONS. 7 
10 (a) Ovary 1, 1-celled, with a single ovule, or 
ovaries several, distinct (but the styles 
sometimes connate at the base). 4s: 
(b) Ovary 1, 1-celled, with two or more 
ovules, or 2-3-celled. 15. 
11 (a) Ovaries several, collateral, distinct or con- 
nate at the base only, rarely ovary 1; in 
this case either marine grasses or the 
male flowers with a tubular perianth 
and a single stamen. Seeds exal- 
buminous. Water- or marsh-plants. 
Flowers usually provided with a 
perianth. Najadaceae. 
(b) Ovaries several, superposed on a stalk-like 
receptacle, or ovary 1. Land, marsh, or 
fresh-water grasses. Stamens 2 or more, 
less frequently only 1, but then perianth 
reduced to scales or wanting. Seeds 
albuminous. Flowers in spikelets, rarely 
solitary. 12. 
12 (a) Ovule pendulous, orthotropous. Anthers 
dehiscing by 1 longitudinal slit. 13. 
(6) Ovule erect or ascending, anatropous. 
Anthers dehiscing by 2 longitudinal 
slits. 14. 
13 (a) Flowers hermaphrodite or polygamous. 
Perianth wanting, but sometimes 1-3 
