CONSPBCJTUS OF THE ORDERS, xi 



by abortion, outer usually herbaceous, inner petaloid. Embryo horseshoe-shaped. 

 Aquatic or marsh herbs. Leaves usually radical. 



CLIII. Naiadace-s:. Flowers monoecious, dioecious, or hermaphrodite. Perianth 

 regular, membranous, or absent ; segments 2-4, valvate. Embryo curved or straight, 

 thick at the radicular end. Aquatic herbs of various habit. 



Series vll. Glnmaceae. — Flowers sessile, solitary within imhricate hracis or 

 glumes arranged in heads or spikelets. Perianth-segments small, scale-like, 

 glumaceous or none. Ovary 1-ovuled or divided into 1-ovuled cells. Seeds 

 albuminous. Herbs, except Bambusece. 



CLIV, Eeiocaule^. Flowers unisexual, densely crowded into monoecious 

 involucrate heads. Perianth-segments 4 or 6, biseriate, small, hyaline, the inner 

 often on a distinct stipes, scarious or membranous. Ovary 3-2-celled; ovules 

 pendulous. Embryo small, outside the albumen remote from the hilum. 



CLV. Restiace-E. Flowers most frequently dioecious, in spikelets; bracts 

 usually dry or rigid. Perianth-segments 6, regular, biseriate, glumaceous or the 

 inner membranous. Ovary 1-3-celled ; ovules solitary, pendulous. Embryo small, 

 outside the albumen remote from the hilum. 



CLVI. Cyperacb^. Flowers uni- or bi-sexual, in spikelets ; glumes imbricate. 

 Perianth of 6 or fewer small scales or bristles, or absent. Ovary 1-celled; ovule 

 erect. Fruit a nut. Seed free from the pericarp ; embryo small, within the base of 

 the albumen. 



