230 



CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Fig. 241.— P. paciftcum. 

 type specimen. 



From 



the more leafy culms, and 

 from P. thermale by the taller 



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 2 mm. 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. S. Hitchcock (no. 3070). 

 The specimen is a tuft of several branching culms. 

 This species is distinguished from P. occidentals 

 by the more copious pubescence throughout, 

 in the autumnal form by the branching habit; 

 late-branching culms, longer, narrower blades, and 

 pilose, not velvety, pubescence, also by the branching habit. It most nearly resem- 

 bles P. huachucae, laxer forms resembling its subspecies silvicola, 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. 



DISTRIBUTION. 



Sandy shores and slopes, and moist crevices in rocks, ascending to 1,650 meters, 

 British Columbia and Idaho to southern California. 



Idaho: Salmon River, Henderson 3569; Lake Coeur d'Alene, Hitchcock 2171, 2190, 

 Leiherg 1312; Lochsa River, Piper 4056; Sawtooth National Forest, Tide- 

 strom 2636. 



Washington: Falcon Valley, Suhsdorf 124; Wenatchee, Whited 1249; Kittitas 

 County, Sandberg & Leiherg 425; Spokane, Kreager 160; Lake Calispell, 

 Kreager 325; Lake Chelan, Gorman 635; Klickitat County, Suhsdorf 6292. 



British Columbia: Vancouver 

 Island, Canby 252, Rosendahl 

 & Brand 107, Waldron 1921. 



Oregon: Grants Pass, Piper 6493; 

 Belknap Springs, Gorman 1834; 

 without locality, Hall 671 

 (Gray Herb.). 



Nevada: Ruby Valley, Watson 

 1350. 



Arizona:, Lowell, W. F. Parish 

 263. 



California. Castle Crag, Hitchcock 

 3070, 3071, 3073, 3077; Red- 

 ding, Heller 7856; Yosemite Valley, Bolander4S40, 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, Hall2244; Pine Ridge, Hall & 

 Chandler 239; Santa Cruz, Jones 2294; Point Reyes, Davy 6745, 6780; Requa, 

 Davy & Blasdale 5894; San Bernardino Mountains, S. B. & W. F. Parish 

 1663; without locality, Bolander 564, Hartweg 2024 (Gray Herb.). 



Fig. 242.— Distribution of P. pacificum. 



