VA8GUL A K PL A N T8 . 147 



Family cm. Juncagineae. 



Calyx not differing from corolla. Lamina of 

 leaves abortive. 



1. Triglochin. L. 



Perigonium deciduous, 3 inner segments 

 sometimes wanting. Ovary 6-locular; ovules 

 in each locule solitary, basal. Styles 3 — 6; 

 stigmas plumose. Capsule separating into car- 

 pidia; nut finally opening neutrally. 



U. scapigerous; inflorescence spicate. 



Family CIV. Potameae. 



Perigonium if present, 4-cleft. Stamens 1, 2 

 or 4. Ovaries 4 — go, 1-ovulate. Carpidia inde- 

 hiscent. Leaves stipulate. 



1. Potamogeton, Toumef. 



Flowers £ . Perigonium 4-cleft. Anthers 4, 

 sessile, inserted on the base of the segments. 

 Ovaries 4; styles 0. 



2£. jointed aquatics; inflorescence pedunca- 

 late; spikes axillary. 



2. Zannichellia, Michel. 



Flowers monoecious. $ and ? in the same 

 axil. Perigonium of $ 0; stameus 1. Perigo- 

 nium of 9 flower cup-shaped; style 1, persist- 

 ent; stigma peltate; ovaries 4. 



1£. submerged aquatics; leaves filiform; flow- 

 ers axillary. 



