HITCHCOCK AND CHASE — NORTH AMERICAN PANICUM. 



165 



of this group; first glume one-third to half the length of the spikelet; second glume 

 and sterile lemma .equal, faintly nerved; fruit 1.3 mm. long, 0.6 to 0.7 mm. wide, 

 elliptic, subacute, not umbonate. 



Autumnal form a dense mat with panicles scarcely rising above the leaves. 



This species is variable as to pubescence. Some of the specimens from Cuba and 

 Guatemala show only a few scattered hairs upon the surface of some of the blades, 

 but these are conspicuously ciliate on the margin. 



DISTRIBUTION. 



Fig. 155. — Distribution of P. strigosum. 



Sandy woods, Virginia and Tennessee to Florida and Louisiana; also in Mexico, 

 Guatemala, and Cuba. 



Virginia: Norfolk County, Kearney 1761. 



North Carolina: Roanoke Island, Chase 3244; Onslow County, Chase 3171; 



Wilmington, Hitchcock 1450, 



Kearney 282. 

 South Carolina: Aiken, Ravenel. 

 Florida: Jacksonville, Curtiss 



3597*, 4031; Washington 



County, Combs 567, 584. 

 Tennessee: White Cliff Springs, 



Scribner in 1890 (Hitchcock 



Herb.). 

 Alabama: Cullman County, Eg- 



gert2l; Gateswood, Tracy 8422; 



Flomaton, Hitchcock 1043. 

 Mississippi: Saratoga, Tracy 8402. 

 Louisiana: Lake Charles, Hitchcock 1162. 

 Mexico: Minatitlan, J. G. Smith 555 (Hitchcock Herb.). 

 Guatemala: Secanquim, Pittier 257; Cuesta de Peixha, Pittier 1800. 

 Cuba: El Guama, Palmer & Riley 213; without locality, Wright 3875 in part. 



Angustifolia. — Plants mostly dull grayish-green, cespitose; vernal culms erect or 

 ascending from a spreading base, mostly 30 or 40 cm., rarely as much as 100 

 cm. high, appressed-villous at base or sometimes above, or rarely smooth 

 even at base; ligules ciliate, less than 1 mm. long; blades narrow, ascending, 

 usually firm and rigid, more or less striate with prominent nerves, and some- 

 times longitudinally wrinkled besides, often ciliate at the base; spikelets 

 attenuate at base, rather strongly 7-nerved, usually pubescent, the hairs aris- 

 ing from bullate papillae; first glume narrow and sheathing at base. Autum- 

 nal culms repeatedly branching, forming bushy crowns, these remaining 

 erect or becoming decumbent or widely spreading; blades much reduced, 

 often involute; a distinct rosette of basal leaves formed in the fall. Species 

 of the Atlantic Coastal Plain. 

 Nodes bearded; plants grayish-villous; autumnal blades flat. 



Spikelets 2 mm. long 92. P. chrysopsi- 



difolium. 



Spikelets 2.5 to 2.8 mm. long 93. P. consangui- 



neum. 

 Nodes not bearded; plants villous only at base, or nearly gla- 

 brous; autumnal blades involute or flat. 

 Autumnal blades flat; lower panicle branches spreading 



or deflexed 94. P. angustifolium. 



