208 



CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Fig. 214.— Distribution of P. wrigMianum. 



ellipsoid, turgid, subacute, pubescent; first glume about one-fourth as long as the 

 spikelet; second glume shorter than the fruit and sterile lemma; fruit 0.8 mm. long, 

 0.5 mm. wide, subacute. 



Autumnal form decumbent-spreading, the culms sending out from the lower and 

 middle nodes numerous ascending branches, becoming somewhat bushy branched, 

 the flat or subin volute blades and secondary panicles not much reduced. 



DISTRIBUTION. 



Along the margins of streams and ponds in sandy or mucky soil, southern New 

 Jersey to Florida and west to Texas; also in Cuba. 

 New Jersey: Bennett, Stone in 1909. 



North Carolina: Wilsons Mills, Chase 3096; Wilmington, Chase 3135, Hitch- 

 cock 373, 374, Kearney 246. 

 Georgia: Hawkinsville, Biltmore 



Herb. 7080a (Biltmore Herb.). 

 Florida: Live Oak, Curtiss 6652; 



Madison County, Combs 290; 



De Funiak Springs, Combs 441, 



477, Curtiss 5912; Monticello, 



Combs 347, 354; Washington 



County, Combs 552, 664; Pen- 



sacola, Combs 524; Grasmere, 



Combs 1068, 1087; Marianna, 



Tracy 3644. 

 Alabama: Mobile, Kearney 49 in part. 

 Mississippi: Biloxi, Kearney 307; Horn Island, Tracy 2861; Petit Bois Island, 



Tracy 4611. 

 Texas: Without locality, Wright (Gray Herb.). 

 Cuba: Without locality, Wright 3463 in part. 



Lanuginosa. — Plants more or less pubescent throughout, usually conspicuously so; 

 ligules densely hairy, 2 to 5 mm. long; blades not over 1 cm. wide, usually 

 narrower; spikelets 1.3 to 3 mm. long, pubescent, the second glume and 

 sterile lemma 5 to 7 or in the larger spikelets 7 to 9-nerved. Autumnal form 

 usually freely branching, secondary leaves and panicles much reduced. 



These species were usually referred by the earlier American authors to P. 

 pubescens Lam. or Michx. 

 Spikelets not over 2 mm. long. 



Plants grayish, velvety-pubescent. 



Spikelets 1.4 to 1.5 mm. long; autumnal blades 



involute-pointed (see also P. albemarlense) 128. P. auburne. 



Spikelets 1.8 to 2 mm. long; autumnal blades flat. 

 Plants dark or olive green when dry; spikelets 

 1.9 to 2 mm. long. 

 Freely branching from lower nodes, decum- 

 bent; vernal blades puberulent on 



both surfaces 130. P. olivaceum. 



Sparingly branching from middle nodes, 

 erect; vernal blades sparingly pilose 



on upper surface 129. P. thurowii. 



Plants light or yellow green when dry. 



Autumnal form prostrate, branching from 

 base and lower nodes, forming close 

 mats; blades not ciliate; around hot 

 springs 135. P. thermale. ' 



