34 THE BIOLOGY OF HARDING COUNTY 



9. JUNCAGINACEAE (Arrow-grass Family) 

 17. Triglochin maritima L. Arrow-grass, 



Abundant along some of the permanent streams. 



10. ALISMACEAE (Water Plantain Family) 



19 Alisma Plantago-aquatica L. Water Plantain. 



Very abundant on mud along all streams. 

 20. Sagittaria arifolia (Nutt) J. G. Smith. Arrowhead. 



Abundant along streams throughout. 

 *2i. Sagittaria cuneata Sheld. 



Fairly common on the smaller water courses. 



n. GRAMINEAE (Grass Family) 



22. Agropyron caninum (L) Beaut. Awned Wheat Grass. 



Rare, floodplain of north Moreau River ; abundant in ravines 

 of Slim Buttes. 



*23. Agropyron dasystachyum (Hook) Scribn. 

 Common in draws on the steppe. 

 [Agropyron pseudorepens Scrib. & Smith. 



Determined by Fromme. "Practically equals A. tene- 



rum," Gray's Manual.] 

 [Agropyron Smithii Rydb. 



Reported by Fromme.] 



24. Agropyron tenerum Vasey. Slender Wheat Grass. 



Very common along valleys and draws throughout. 



25. Agrostis hiemalis (Wats.) B. S. P. Tickle Grass. 



A very abundant grass; mixed with other grasses on the 



plains and floodplains, especially prominent in the bluestem- 



filled draws. Has "the tumble-weed habit." 

 26 Alopecurus fulous Smith. 



Shaded brooksides, West Short Pines. 

 *27 Alopecurus pratensis L. 



Locally common on the steppe. 

 28 Andropogon furcatus Muni. Bluestem. 



Common on grassy hillsides and in draws of the steppe. 



(Indicates moister conditions.) 



30 Andropogon Hallii. Hack. 



Common on sandy part of floodplains and about Cave Hills. 



31 Andropogon scoparius Michx. Little Bluestem. 



Fairly plentiful on the plains. 



