6 ALISMALES 



Phylum ANTHOPHYTA 



The flowering plants. 



Class MONONCOTYLEDONEAE 



The monocots. 



ALISMALES. 



Perianth of two series. 



The inner series corolloid; the outer green. 1. Alismaceae. 



Both series alike. 2. Scheuchzeriaceae. 



Perianth of a single series or wanting. 3. Potamogetonaceae. 



1. ALISMACEAE. 



Carpels in several series on a convex receptacle. 

 Some or all of the flow^ers perfect. 



Calyx spreading, achenes scarcely compressed. 1. Echinodorus. 

 Calyx closed over the fruits, achenes strongly compressed. 



2. Lophotocarpus. 



Flowers monoecious or dioecious. 3. Sagittaria. 



Carpels in a single series on a flat receptacle. 4. Alisma. 



1. Echinodorus. 54. 

 1. Echinodorus cordifolius (L.) Griseb. 

 Abundant in a pond at Xemaha. 



2. Lophotocarpus. 55. 



1. Lophotocarpus calycinus (Engelm.) Smith. 

 In Lake Kearney; Greenwood. 



3. Sagittaria. 56. 



Arrow-heads. 



Leaves sagittate with large basal lobes. 



Basal lobes of the leaf-blades not longer than the blade proper. 

 Beak of the achene at right angle to the body, one-fourth as long as 

 the body, or more. 1. S. latifolia. 



Beak erect, short. 



Bracts lanceolate, 8-20 mm. long; petioles short, leaves seldom 



floating. 2. S. arifolia. 



Bracts ovate-lanceolate, 4-6 mm. long; petioles very long, blades 



floating or none. 3. S. cuneata. 



Basal lobes of the leaf-blades 2-3 times as long as the blade proper. 



4. S. longiloba. 

 Leaves not sagittate; basal lobes, if any, small. 



Pistillate flowers sessile or nearly so. 5. S. rigida. 



Pistillate flowers not sessile. 6. S. gramineae. 



1. Sagittaria latifolia Willd. 

 Common in muddy places or in shallow water all over the state. A 



