58 Order HYDRALES 
county; Franklin; Gage county; Halsey; Lincoln; Mullen; Thedford; 
Valentine; Wahoo; Whitman. 
3. Andropogon chrysocomus Nash. 
Halsey. 
4. Andropogon hallii Hack. Sand-hill Blue-stem. 
Common on high prairies in the central and western parts of the 
state. Antelope county; Banner county; Box Butte county; Chelsea; 
Garden county; Haigler; Lawrence Fork; Long Pine; Plummer Ford; 
Thedford; Valentine. 
5. Andropogon paucipilus Nash. 
Nebraska, according to Britton’s Manual. 
2. Sorghastrum. 71. 
1. Sorghastrum avenaceum (Michx.) Nash. Indian Grass. 
Sorghastrum nutans (L.) Nash. 
Common on the prairies. Ayr; Carns; Dismal river; Deuel county; 
Hardy; Halsey; Lincoln; North Platte; Thedford; Valentine. 
Tribe 10. MAYDEZ. 
1. Tripsacum. 67. 
1. Tripsacum dactyloides L. Gama-grass. 
In low wet places in the southeastern part of the state. Nemaha; 
Richardson county; Weeping Water. 
HYDRALES. 
1. HYDROCHARITACEZ. 
1. Philotria (Elodea). 60. 
1. Philotria canadensis (Michx.) Britton. Elodea or Water-weed. 
In ponds and streams, rare. Ewing; Neligh. 
IRIDALES. 
Stamens 6. 1. Amaryllidacez. 
Stamens 3. 2. Iridaceze 
1. AMARYLLIDACEZ2. 
Amaryllis Family. 
1. Hypoxis. 280. 
1. Hypoxis hirsuta (L.) Coville Yellow Star-grass. 
In low prairies in the eastern part of the state. Ashland; Inman; 
Lincoln; Newark; Otoe county; Plainview. 
2. IRIDACEZ. 
Iris Family. 
Style-branches petal-like, opposite the stamens. 1. Iris. 
Style-branches not petal-like, alternate with the stamens. 
Petals mottled, flowers 3-5 cm. broad. 2. Gemmingia. 
Petals not mottled, flowers less than 3 em. broad. 3. Sisyrinchium. 
