72 



PUBLIC HEALTH BULLETIN NO. 2 86 



ALISMACEAE Water plantain family 



1. Fruits borne in a ring; stamens 6; inflorescences much 1. Alisma, p. 72. 



branched (fig. 1). 

 1. Fruits in dense heads; stamens usually more than 6; 2. 

 Infloi scences not greatly branched. 



2. Lowest flowers with only carpels, or with only 2. Sagittaria, p. 72. 



stamens (fig. 2). 

 2. Lowest flowers with both stamens and carpels — 3. 



Figure 1. 



Figure 2. 



3. All flowers with stamens and carpels (fig. 3) . 

 3. Upper flowers with stamens only (fig. 4) 



3. Echinodorus, p. 75. 



4. Lophotocarpus,p.75. 



Figure 3. 



Figure 4. 



1. Alisma L. 



A. subcordatum Raf. — Should occur over most of our territory but 

 noted only a few times. Seems to prefer alluvial situations, 



2. Sagittaria L. 



1. Sepals appressed to the fruit head 1. S. montevidensis. 



1. Sepals lax or reflexed but not appressed to the fruit 2. 

 head. 



2. Fruit-bearing pedicels reflexed or recurved 3. 



2. Fruit-bearing pedicels ascending. _. 5. 



