HITCHCOCK AND CHASE—NORTH AMERICAN PANICUM. 229 
DESCRIPTION, 
Vernal form tufted, yellowish green; culms slender, 15 to 40 cm. high, rarely 
higher, spreading, the lower internodes usually short, as in P. subvillosum, producing 
a leafy base as in that species, sparsely papillose-pubescent, the upper more or less 
elongated, glabrate, the nodes pubescent; sheaths rather sparsely papillose-pubescent, 
rarely almost glabrous; ligules 3 to4 mm. long; blades 
firm, erect or ascending, 4 to 8 cm. long, 5 to 7 mm. 
wide, acuminate, rounded at the base, the upper 
surface with a few long hairs toward the base and 
margin, otherwise glabrous, the under surface ap- 
pressed-pubescent; panicles long-exserted, 4 to 7 
em. long, about two-thirds as wide, rather loosely 
Fic. 23.—P. occidentale. From type flowered, the flexuous branches ascending or spread- 
specimen at Prague. ing; spikelets 1.8 mm. long, 1 mm. wide, elliptic- 
obovate, subacute, pubescent; first glume one-fourth 
the length of the spikelet or less, obtuse or pointed; second glume and sterile 
lemma as long as the fruit at maturity; fruit 1.6 mm. long, 0.9 mm. wide, elliptic, 
subacute. 
Autumnal form branching from the lower nodes, forming a spreading bunchor 
tussock 10 to 15 cm. high; leaves and panicles reduced; winter rosette appearing 
late, the blades narrowly lanceolate, glabrous or pilose at base. 
This species is less pubescent than any other in this group. 
DISTRIBUTION, 
Peat bogs and moist sandy ground, British Columbia and Idaho to southern California. 
Tpauo: Lake Coeur d’ Alene, Sand- 
berg, Heller & MacDougal in 
1892; Priest Lake, Piper 3778. 
WASHINGTON: Montesano, /J//eller 
3978; Chelan County, Whited 
in 1901; Lake Chelan, Elmer 
489, Lake & Hull 118; Bingen, 
Suksdorf 5162, 5174; Granville, 
Conard 378, Yakima County, 
Cotton 736, 792. 
BritisH CoLumBtia: Lake Osoyoos, 
Macoun 77229; Vancouver Is- Fig. 240.—Distribution of P, occidentale. 
land, Canby 352 (Gray Herb.). ; 
OrEGON: Mount Scott, Sheldon in 1902; Columbia River, Sheldon 8706. 
CALIFORNIA: Crescent City, Davy 5971; Mendocino, Davy 6092, MceMurphy, 425; 
New York Falls, Hansen 1723; Yosemite Valley, Brewer 1646; Merced River, 
Torrey 587; San Diego, Orcutt 540; without locality, Bridges 366, Hartweg 2024, 
134. Panicum pacificum sp. nov. 
DESCRIPTION. 
Vernal form light green; culms tufted, 25 to 50 cm. high, ascending or spreading, 
leafy (culm leaves 5 or 6), papillose-pilose with spreading hairs, the nodes shortly 
spreading-pilose; sheaths papillose-pilose, the papillee prominent; ligules 3 to 4 mm, 
long; blades erect or ascending 5 to 10 cm. long, 5 to 8 mm. wide, acuminate, nar- 
rowed toward the rounded base, the upper surface papillose-pilose, typically with 
short hairs intermixed, but these often wanting and the long hairs sometimes sparse, 
