Family ALISMACEZS 15 
Phylum V. ANTHOPHYTA. 
The Flowering Plants. 
Class MONOCOTYLEDONEAE. 
The Monocots. 
ALISMALES. 
Perianth of two series. 
The inner series. corolloid; the outer green. 1. Alismacee. 
Both series alike. Leaves linear. 2. Scheuchzeriacee. 
Perianth of a single series or wanting, often 4-parted. 
3. Potamogetonacee. 
1. ALISMACEZ. 
Water-plantain Family. 
Carpels in several series on a convex receptacle. 
Some or all of the flowers perfect. 
Calyx spreading, achenes scarcely compressed. 1. Echinodorus. 
Calyx closed over the fruits, achenes strongly compressed. 
2. Lophotocarpus. 
Flowers monecious or diccious. 3. Sagittaria. 
Carpels in a single series on a flat receptacle. 4, Alisma. 
1. Echinodorus. 54. 
1. Echinodorus cordifolius (L.) Griseb. Bur-head. 
Abundant in a pond at Nemaha. 
2. Lophotocarpus. 55. 
1. Lophotocarpus calycinus (Engelm.) J. G. 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 terminal portion 
of blade. 
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. 2. S. cuneata. 
Basal lobes of the leaf-blades 2-3 times as long as the terminal 
portion of blade. 3. S. longiloba. 
Leaves not sagittate: basal lobes small, or wanting. 
Pistillate flowers sessile or nearly so. 4. S. rigida. 
Pistillate flowers not sessile. 5. S. graminea. 
1. Sagittaria latifolia Willd. 
Common in muddy places or in shallow water all over the state, 
especially in the sand-hills. A very variable species and is sometimes 
divided into several forms. Cody; Kearney; Lincoln; Long Pine; 
Minden; Thedford. 
2. Sagittaria cuneata Sheldon. 
Sagittaria arifolia Nutt. 
