(323) 



and ventral placentation, Carpidia dry, inde- 

 hiscent. Lamina of leaves nervose. 



1. Alisma L. Water- Plantain. 



Flowers ^ . Calyx laerbaceous. Corolla pet- 

 aloid. Ovaries cc , 1 -ovulate. Akenes oo , ver- 

 ticillate. — It- Aquatic. Scapigerous. Inflores- 

 cence verticillate, paniculate. 



1. A. PLA.NTAGO L. Flowers pale. — Com- 

 mon. Summer. 



Family 2. JUNCAGINE^. 



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. — U- Scapigerous. Inflores- 

 cence spicate. 



1. T. MARiTiMUM L. Common. Summer. 



Family 3. POTAME^. 



Perigonium if present, 4-cleft. Stamens 1, 

 2, or 4. Ovaries 4- go, 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. 



