(323) 



and ventral placentation. Carpidia dry, inde- 

 hiscent. Lamina of leaves nervose. 



1. Alisma L. WATER- PLANTAIN. 



Flowers $ . Calyx herbaceous. Corolla pet- 

 aloid. Ovaries GO , 1-ovulate. Akenes GO , ver- 

 ticillate. if. Aquatic. Scapigerous. Inflores- 

 cence verticillate, paniculate. 



1. A. PLANTAGO L. Flowers pale. Com- 

 mon. Summer. 



Family 2. JUNCAGINE^E, 



Calyx not differing from corolla. Lamina of 

 leaves abortive. 



1, Triglochin L. ARROW- GRASS. 



Perigonium deciduous, 3 inner sepals some- 

 times wanting. Ovary 6-celled; ovules in each 

 cell solitary, basal. Styles 3-6; stigmas plum- 

 ose. Capsule separating into carpidia; finally 

 opening ventrally. 2. Scapigerous. Inflores- 

 cence spicate. 



1. T. MABITIMUM L. Common. Summer. 



Family 3, POTAME.E, 



Perigonium if present, 4-cleft. Stamens 1, 

 2, or 4. Ovaries 4- oo, 1-ovulate. Carpidia in- 

 deliiscent. Leaves stipulate. 



1, Potamogeton TOURN. PONDWEED. 



Flowers $ . Perigonium 4-cleft. Anthers 4, 

 sessile, inserted on the base of the sepals. 



