128 



GRAMINEAE. 



Vol. I. 



6. Paspalum psammophilum Nash 

 trate Paspalum. Fig. 293. 



Paspalum prostratum Nash, in Britton, Man. 74. 1901. 



Not Scribn. & Merr. 1901. 

 Paspalum psammophilum Nash ; Hitchc. Rhodora 8 : 



205. 1906. 



A tufted branching softly pubescent perennial with 

 prostrate culms forming dense mats, flat leaf-blades, 

 and densely pubescent spikelets. Culms li°-3° long; 

 sheaths softly and densely pubescent with short 

 hairs ; blades erect or nearly so, of medium texture, 

 softly and densely pubescent on both surfaces, ciliate 

 on the margins, lanceolate, up to 4' long, 2i"-4" wide ; 

 racemes on the main culm 2, rarely more or only I, 

 2's' long, the rachis less than 4" wide; spikelets in 

 pairs, 1" long and a little less than 1" wide, oval, the 

 first scale 3-nerved, the second usually 2-nerved by 

 the suppression of the midnerve. 



In dry sandy soil, southern New York to Delaware. 



5. Paspalum ciliatifolium Michx. Ciliate- 

 leaved Paspalum. Fig. 292. 



Paspalum ciliatifolium Michx. Fl. Bor. Am. 1 : 44. 

 1803. 



A tufted branching perennial, with flat leaf- 

 blades, which are glabrous excepting on the ciliate 

 margins, and glabrous spikelets. Culms i£°-2i° 

 tall ; sheaths ciliate on the margin ; blades 10' 

 long or less, 3"S" wide, linear to lanceolate; 

 racemes single, or sometimes in pairs, 2'-4i' long, 

 the rachis i" wide or less; spikelets in pairs, 

 about 1" long and less than 1" wide, oval to 

 broadly obovate, the two outer scales 3-nerved, 

 or the second one rarely 2-nerved by the suppres- 

 sion of the midnerve. 



In rocky or sandy soil, Maryland to Florida and 

 Mississippi. June-Aug. 



Pros- 



7. Paspalum Bushii Nash. Bush's Pas- 

 palum. Fig. 294. 



Paspalum Bushii Nash, in Britton, Man. 74. 1901. 



A tufted branching perennial, with flat ciliate 

 leaf-blades, and pubescent spikelets. Culms erect 

 or ascending, i°-3° tall; sheaths, at least the 

 lower ones, softly pubescent, ciliate on the margin ; 

 blades erect or ascending, rather firm in texture, 

 softly and densely pubescent on both surfaces 

 with short hairs and with a few long rather stiff 

 hairs intermixed, lanceolate, 2'-8' long, 2"-8" 

 wide; racemes usually in pairs on the main culm, 

 2F-5' long, the rachis less than \" wide; spike- 

 lets in pairs, about 1" long, orbicular or nearly 

 so, the empty scales densely pubescent, 3-nerved, 

 or the second sometimes 2-nerved by the suppres- 

 sion of the midnerve. 



In dry soil, Missouri and Nebraska to Texas. 



