too CI.ASS XX. ORDERS I and II. 



sifi/iOf stem twining, peduncles bracted, limb of co- 

 rol o-cleft. k ' y. 



* Arum was formerly placed here, but is now re- 

 moved to class monoecia. 



CLASS XX. MONOECL^, 



Order I. Mokandria. 



Fluvialis. Staminate flowers— calyx : corol 

 : anther sessile. Pistillate flowers — calyx : co- 

 rol : style filiform : stigma 2-cleft : capsule 1- 

 seeded. 15.6. (Flowers axillary.)— -;^earf//6f, (river- 

 nymph) leaves in sixes linear 2-toothedat the apex. 

 (^.-^frag'ilisj leaves in threes or opposite prickly- 

 toothed, (x). 



Chara. Staminate flowers^— calyx : corol : 

 anther globose, sessile. Pistillate flowers — calyx 

 : corol : style : stigmas 5 : berry 1 -celled, 

 many-seeded. (Aquatics.) 15. 6 — vulgaris (chara) 

 brancldets terete, joints leafy, leafets oblong-subu- 

 late--/o/io&a, the leafets linear. 



Najas — Staminate flowers — calyx 2-lobed : co- 

 rol 4-cleft : anthers sessile, cohering. Pistillate 

 flowers — calyx 0: corol 0: style subulate : stigma 

 2 or 3-cleft : capsule 1 to 4-seeded. 15. 6 — canu' 

 densis (water nymph) small filiform smooth, leaves 

 narrow-linear. 



Order II. Diandria. 



Lemna. Staminate flowers — calyx 1 -leafed : co- 

 rol 0. Pistillate flowers — calyx 1 -leafed : corol : 

 capsule 1 -celled, 2-seeded. 54. 6 — minor (duck- 

 meat) leaves oval flat both sides cohering at their 

 bases, root solitary — fiolyrhiza^ leaves oval flat co- 

 hering 2 opji|rtPgether, roots fascicled. Leaves 

 greenish-purpIP; appear like flaxseed, scattered 

 upon the surface of stagnant waters, with the roots 



