HITCHCOCK AND CHASE—NORTH AMERICAN PANICUM. 59 
DESCRIPTION. 
Plants light yellowish green, in small tufts, freely branching, erect or rarely decum- 
bent at base, 15 to 50 cm. high, depauperate, northern specimens sometimes forming 
small mats; culms slender, papillose-hispid to nearly glabrous, more or less zigzjg at 
base, the lower internodes much shortened; sheaths mostly longer than the internodes, 
papillose-hispid; blades erect or ascending, 4 to 15 cm. long, 2 to 6 mm. wide, rather 
sparsely hirsute, rarely nearly glabrous; panicles exserted, diffuse, ovoid, 10 to 20 cm. 
long, forming one-third the entire height of the plant or more, few-flowered, the 
capillary, scabrous branchlets solitary, bearing rather short-pediceled spikelets, 
usually in twos, at the ends; spikelets 1.7 to 2 mm. long, 0.7 mm. wide, elliptic; 
first glume about two-fifths the length of the spikelet, 5-nerved, acute; second glume 
and sterile lemma equal, only slightly exceeding the fruit, the palea of the sterile 
floret wanting; fruit 1.5 mm. long, 0.6 mm. wide, elliptic. 
This species differs from P. capillare in its narrow, erect blades, more slender culms, 
and smaller, fewer-flowered panicles, with more divergent branches and spikelets 
mostly intwos. The spikelets are usually slightly smaller, but the spikelets of the type 
of P. philadelphicum and of several other specimens are 2 mm. long. 
Two specimens from Stone Mountain, Georgia, Harper 184 and Hitchcock 439, have 
spikelets 2.2 mm. long, and are erect, narrow-leaved plants with somewhat the aspect 
of P. flexile. 
DISTRIBUTION. 
Dry open or sandy ground, Maine to Wisconsin and Oklahoma, south to Georgia and 
Mississippi. 
QuEBEc: Chandiere River, Macoun 7444 (Herb. Geol. Survey Can.). 
Marne: Holden, Knight in 1893; Mattawamkeag, Fernald 2802; Henderson, 
Parlin 1776. 
New Hampesuire: Alstead, Fernald 361. 
Vermont: Lake Memphremagog, Tuckerman in 1859 (Gray Herb.). 
Connecticut: Hadlyme Ferry, Graves 167. 
RuoveE Isuanp: Lincoln, Fernald in 1906 (Gray Herb.). 
New Yorx: Kinderhook Lake, Peck; Verona, Haberer in 1900. 
New Jersey: Lakehurst, Macken- 
A zie 2366. 
” PENNSYLVANIA: LancasterCounty, 
wth Heller 4789. 
* — Oxto: Ottawa, Kellerman in 1900 
(Univ. Ohio Herb.). 
Wisconsin: Sauk City, Zuders in 
1885; Granite Heights, Cheney 
2911. 
Missouri: Monteer, Bush 5119, 
5120; Readings Mill, Bush 5203. - 
Detaware: Collins Beach, Com- Fig. 41.—Distribution of P. philadelphicum. 
mons in 1879. 
MaryLanp: Glen Echo, Kearney in 1897; Chevy Chase, Chase 2599. 
District or CotumsBia: Chase 5441, Kearney in 1897, Steele in 1899, Vasey in 1882, 
Williams 10 in part, 12. 
Virainta: Four-Mile Run, Hitchcock 166; Alexandria, House 413; Portsmouth, 
Chase 3687; Craigs, Steele 16. 
West Vireinita: Aurora, Steele in 1898; Baileysville, Morris 1283. 
_ Nort Carona: Chapel Hill, Ashe. 
Sours Carona: Orangeburg, Hitchcock 7. 
Groreia: Thomson, Bartlett 1024; Stone Mountain, Harper 184, Hitchcock 439. 
