208 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
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 subinvolute 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 Carona: Wilsons Mills, Chase 3096; Wilmington, Chase 3135, Iitch- 
cock 373, 374, Kearney 246. 
GeoraiA: Hawkinsville, Biltmore 
Herb, 7080a (Biltmore Herb.). 
Fioripa: 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. Fic. 214.—Distribution of P. wrightianum. 
AtaBAMA: Mobile, Kearney 49 in part. 
Mississiper: Biloxi, Aearney 307; Horn Island, Tracy 2861; Petit Bois Island, 
Tracy 4611. 
Texas: Without locality, Wright (Gray Herb.). 
Cusa: 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 . albemarlense)....128. P. auburne. 
Spikelets 1.8 to 2mm. 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. .............2.-2-2--- 130. P. olivaceum. 
Sparingly branching from middle nodes, 
erect; vernal blades sparingly pilose 
on upper surface..........2..------- 129. P. thurowiti. 
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. 
