608 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



17. Paspalum stramineum Nash. 

 (Fig. 878.) Yellowish green, the culms 

 erect, 40 to 100 cm. tall; blades 6 to 

 25 cm. long, rarely longer, 6 to 15 

 mm. wide, puberulent on both sur- 

 faces and sparsely pilose as well, or 

 the lower surface nearly glabrous; ra- 

 cemes 2 or 3, rarely 4, 6 to 14 cm. 

 long, the axillary often wholly or 

 partly included in the sheaths, short 

 racemes commonly borne in basal 

 sheaths; spikelets suborbicular, 2.1 to 

 2.2 mm. long, pale, from densely pu- 

 bescent to glabrous. % (P. bushii 

 Nash.) — Sandy soil, in open ground 

 or open woods, Indiana to Minne- 

 sota, Texas, Arizona, and northwest- 

 ern Mexico. 



18. Paspalum pubescens Muhl. 

 (Fig. 879.) Culms ascending, 45 to 

 90 cm. tall, often pilose at the sum- 

 mit; sheaths usually pilose toward 

 the summit; blades 8 to 20 cm. long, 



Figure 876. — Paspalum supinum. Panicle, X 1; two 

 views of spikelet, and floret, X 10. (Chase 4572, 

 N. C.) 



-*•** 



111 



Figure 877. — Paspalum psammophilum. Panicle, X 1: two 

 views of spikelet, and floret, X 10. (Graves, N. Y.) 



brous, or the glume minutely pubes- 

 cent. % — Diy, sandy, open 

 ground and old fields, Virginia to 

 Florida and west to Louisiana. 



16. Paspalum psammophilum 

 Nash. (Fig. 877.) Forming dense 

 grayish-olivaceous mats, the culms 

 usually prostrate, 25 to 100 cm. long; 

 sheaths appressed-pubescent ; blades 

 4 to 16 cm. long, 4 to 11 mm. wide, 

 densely appressed-pubescent ; ra- 

 cemes 1 to 3, commonly 2, 4 to 9 cm. 

 long, the axillary ones wholly or 

 partly included in the sheaths; spike- 

 lets suborbicular, 2 mm. long, the 

 glume densely pubescent. 91 — 

 Dry sandy soil, mostly near the 

 coast, Massachusetts to New Jersey. 



2 to 10 mm. wide (rarely larger), 

 pilose on both surfaces; racemes 1 

 to 3, 4 to 17 cm. long; spikelets about 

 2 mm. long, suborbicular, usually 

 glabrous. % (P. muhlenbergii 

 Nash.) — Open ground or open woods, 

 common in old fields and pastures, 

 especialfy in sandy regions, Vermont 

 to Florida, west to Michigan, Kansas, 

 and Texas. 



19. Paspalum ciliatifolium Michx. 

 (Fig. 880.) Culms erect to spreading, 

 35 to 90 cm. tall; sheaths glabrous or 

 the lower puberulent; blades 10 to 

 35 cm. long, 7 to 20 mm. wide (rarely 

 larger), usually strong^ ciliate along 

 the margin and glabrous otherwise; 

 racemes 1 to 3, usually 7 to 10 cm. 



