UW 
230 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
the lower surface appressed papillose pubescent; panicles usually rather short- 
exserted, 5 to 10 cm. long, about three-fourths as wide, the flexuous branches ascend- 
ing; spikelets 1.8 to 2mm. long, 1 to 1.1 mm. wide, obovate, obtuse, turgid, papillose- 
pubescent; first glume one-fourth to one-third the length of the spikelet, truncate; 
second glume and sterile lemma equaling the fruit at maturity; fruit 1.6 mm. long, 
1 mm. wide, elliptic-obovate, obtuse or obscurely pointed. 
Autumnal form prostrate-spreading, repeatedly branching from the middle and 
upper nodes after the maturity of the primary panicle, the reduced blades less pilose 
than the vernal ones, exceeding the reduced 
panicles; winter rosette appearing rather early, 
blades only sparsely pubescent. 
Type U. S. National Herbarium no. 592751, 
collected August 3, 1908, in moist places in woods, 
one-fourth mile east of hotel, Castle Crag, Shasta 
County, California, by A. 8. Hitchcock (no. 3070). 
The specimen is a tuft of several branching culms. 
This species is distinguished from P. occidentale 
by the more copious pubescence throughout, 
the more leafy culms, and in the autumnal form by the branching habit; 
from P. thermale by the taller, late-branching culms, longer, narrower blades, and 
pilose, not velvety, pubescence, also by the branching habit. It most nearly resem- 
bles P. hwachucae, laxer forms resembling its subspecies si/vicola, and like these it is 
variable in amount of pubescence. The spreading habit and larger spikelets, together 
with a distinct range, make it impossible to include this western form under P. 
huachucae. 
Wig. 241.—P. pacificum. From 
type specimen. 
DISTRIBUTION. 
Sandy shores and slopes, gnd moist crevices in rocks, ascending to 1,650 meters, 
British Columbia and Idaho to southern California. 
Ipano: Salmon River, Henderson 3569; Lake Coeur d’ Alene, Hitchcock 2171, 2190, 
Leiberg 1312; Lochsa River, Piper 4056; Sawtooth National Forest, Tide- 
strom 2636. 
WasHINGTON: Falcon Valley, Suksdorf 124; Wenatchee, Whited 1249; Kittitas 
County, Sandberg & Leibery 425; Spokane, Kreager 160; Lake Calispell, 
Kreager 325; Lake Chelan, Gorman 635; Klickitat County, Suksdorf 6292. 
British CoLumBiIA: Vancouver 
Island, Canby 252, Rosendahl 
& Brand 107, Waldron 1921. 
OreEGon: Grants Pass, Piper 6493; 
Belknap Springs, Gorman 1834; 
without locality, Hall 671 
(Gray Herb.). 
Nevapa: Ruby Valley, Watson 
1350. 
Arizona: Lowell, W. F. Parish 
263. 
CaLirorniA. Castle Crag, Hitchcock 
3070, 3071, 3073, 3077; Red- 
ding, Heller 7856; Yosemite Valley, Bolander 4840, Hall & Babcock 3317, 3362, 
Hitchcock 3214, 3219, 3232, 3233, 3234; Crow Point, Hansen 1444; Clinton Bar, 
Hansen 1381; Pine Grove, Hansen 626; North Fork, Griffiths 4438, 4476, 4617; 
Madera, Griffiths 6586; San Jacinto Mountains, Hall 2244; Pine Ridge, Hall & 
Chandler 239; Santa Cruz, Jones 2294; Point Reyes, Davy 6745, 6780; Requa, 
Davy & Blasdale 5894; San Bernardino Mountains, 8S. B. & W. F. Parish 
1663; without locality, Bolander 564, Hartweg 2024 (Gray Herb.). 
Fic. 242.—Distribution of P. pacificum. 
