250 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Autumnal form prostrate, forming mats, with short, fascicled branchesat all the nodes, 
the branches appearing before the maturity of the primary panicles; leaves and 
panicles not greatly reduced, the latter overtopped by the blades, which are less pilose 
than earlier ones; winter blades sparsely pilose above. 
This species is more copiously pubescent than any other in this group and in this 
character resembles species of the Lanuginosa, but its affinity seems to be rather 
with the Columbiana. 
DISTRIBUTION. 
Sand barrens along the coast, Massachusetts to Virginia. 
Massacuusetts: Nantucket, Bartlett 1368, 1379, Bicknell in 1906, Hitchcock 558; 
Plymouth, Oakes; Quanquisset, Bartlett 1327. 
Connecticut: Groton, Bissell 9306 
(Bissell Herb.). 
New Yorr: Northville, Young in 
1871; West Rockaway, Bicknell 
in 1903; Lawrence, Bicknell 
in 1906; Hempstead, Bicknell 
in 1903; Woodmere, Bicknell 
in 1902; Rockville Center, 
Bicknell in 1906; Valley 
Stream, Bicknell in 1905. 
New Jersey: Absecum, Commons 
45; Tuckerton, Chase 3609; 
East Plains, Stone 8; Atlantic 
City, Parker; Hammonton, Canby in 1902; South Amboy, Mackenzie 1355; 
Atsion, Chase 3562; Toms River, Chase 3576; Forked River, Chase 3581. 
DELAWARE: Rehoboth, Commons 59, 60; Lewes, Hitchcock 47. 
Virainia: Ocean View, Coville 13, 14, Kearney 1461; Cape Henry, Chase 5431. 
Fig. 272.—Distribution of P. oricola. 
Sphaerocarpa.—Culms usually few in a tuft, rather stout, glabrous; ligules obsolete 
or nearly so; blades mostly thick and firm, cordate and ciliate at base, mar- 
gins strongly cartilaginous; spikelets obovoid-spherical at maturity, oval 
when young, | to 1.8 mm. long, puberulent; second glume and sterile lemma 
5 to 7-nerved; panicle branches mostly viscid. Autumnal form remaining 
simple or but sparingly branching, the thick, white-margined blades of the 
winter rosette conspicuous. 5 
Culms spreading; blades obscurely nerved; panicle nearly as broad as long. 
Ligules obsolete or wanting; blades lanceolate. .......-- 149. P.sphaerocarpon. 
Ligules evident, 0.3 to 1 mm. long; margins of blades 
parallel for at least two-thirds their length... ....- 149a. P. sphaerocarpon 
inflatum. 
Culms erect or ascending; blades rather strongly nerved; 
panicle never more than two-thirds as broad as long, 
usually less. 
Spikelets 1.5 to 1.6 mm. long; blades lanceolate, the 
upper not reduced 2 <5 acs. |e eee 150. P. polyanthes. 
Spikelets 1 to 1.2 mm. long; blades tapering from base to : 
apex, the upper much smaller than the lower..:...151. P. erectifolium. 
