278 



CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Fig. 312.— Distribution of P. pateniifolium. 



DISTRIBUTION. 



Dry sand, especially in "scrub, " Georgia to Florida and Mississippi. 

 Georgia: Dock Junction, Richer 963 in part. 

 Florida: St. Augustine, Richer 945; Gainesville, Chase 4245; Cedar Key, Combs 



777, 778; Eustis, Chase 4051, 4058, 4088, Hitchcock 796, 802, Nash 52, 72; 



Titusville, Chase 4028, 4029, 



Hitchcock 7 Q7; Ormond, Hitch- 

 cock 563; Clearwater, Tracy 



6702; Jensen, Hitchcock 730; 



Braidentown, Combs 1288, 



1333, Hitchcock 969, 970, 971; 



East Pass, Tracy 6350; Mary 



Esther, Tracy 9139; Tampa, 



Hitchcock 930; Arcadia, Hitch- 

 cock 856; Sebastian, Hitchcock 



755; Myers, Chase 4im^, 4170, 



Hitchcock 915^. 

 Alabama: Fort Morgan, Tracy 



7174. 

 Mississippi: Biloxi, Kearney 330 in part. 



Oligosanthia. — Culms rather stout, usually erect; sheaths more or less hirsute, vil- 

 lous, or sometimes glabrous; ligules inconspicuous except in P. ravenelii; 

 blades firm, not over 2 cm. wide, usually nan-ower; spikelets about 3 to 4 mm. 

 long, obovate, tm'gid, usually papillose-hirsute, strongly 7 to 9-nerved. Au- 

 tumnal form with branches more or less crowded toward the summit. 

 Nodes bearded; blades velvety-pubescent beneath. 



Plants lax, soft- velvety throughout; spikelets not over 



3 mm. long ] 69. F. rnalacophyl- 



lum . 

 Plants stiff, pubescence harsh; spikelets about 4 mm. 



long 173. P. ravenelii. 



Nodes not bearded (or but obscurely so in P. iirilcoxianum); 

 blades not velvety. 

 Panicle nan'ow, branches erect, or spreading only at 

 anthesis; blades erect. 

 Spikelets not over 3 mm. long; blades not over 6 mm. 



wide 168. P. ivilcoxianum. 



Spikelets 3.7 to 4 mm. long; blades 8 to 20 mm. wide. 



Blades papillose-hispid 174. P. leibergii. 



Blades glabrous on both surfaces 175. P. xanthophysum. 



Panicle about as wide as long. 



Spikelets narrowly obovate, subacute; plants oliva- 

 ceous, appressed-pubescent 172. P. oligosanthes. 



Spikelets broadly obovate, turgid, blunt; plants 

 green, pubescence, if present, not appressed. 

 Blades erect, not over 6 mm. wide; plants copi- 

 ously hirsute throughout 168. P. wilcoxianum. 



Blades ascending or spreading, rarely less than 

 8 mm. wide, usually wider; plants not 

 hirsute throughout. 



