Scheuchzeriaceae, Alismataceae 13 



Fam. 4. SCHEUCHZERIACEAE (Juncaginaceae). 

 Scapigerous marsh herbs with narrow, rush-like leaves. 

 Inflorescence racemose. Flowers monocHnous or diclinous, 

 4-1-merous. Perianth homochlamydeous, herbaceous. 

 Each carpel with 1-2 anatropous ovules. 



Tribe. Triglochineae. All flowers of inflorescence 

 similar. 



Bracts absent. Anthers subsessile, short. Triglochin. 

 Inflorescence bracteate. Filaments and anthers long. 



Scheuchzeria. 



Suborder 2. Alismatineae. Flowers hypogynous, 

 mostly heterochlamydeous. Ovnles on the ventral 

 suture. 



Fam. 5. Alismataceae. Marsh herbs. Leaves 

 chiefly radical. Inflorescence often much branched. 

 Flowers mostly monoclinous and heterochlamydeous, 

 3-merous. Stamens 6-00 . Carpels 6-00 each with 

 i-oo anatropous ovules. Styles 6-^ . Fruit o( a.chenes 

 or follicles. 



a. Flower-axis flat. Stamens 6 in one whorl. 

 Carpels also more or less cyclic. 



a. Carpels with one ovule. 



Leaves erect, flowers whorled. Alisma. 



Leaves floating, flowers subsolitary. Elisma. 



/3. Carpels with two or more ovules. 



Leaves erect, carpels connate. Damasonium. 



d. Flower-axis convex. Stamens mostly more 

 than 6, sometimes spiral. Carpels arranged in a head, 

 acyclic. 



Flowers hermaphrodite. Fruit ribbed, scarcely com- 

 pressed. Echinodorus. 



