230 



CONTRIBUTIONS PROM THE NATIONAL HERBARIUM. 



s 



Fig. 241.— p. paciftcum. From 

 type speoimen. 



the lower surface appressed papillose pubescent; panicles usually rather short- 

 exserted, 5 to 10 cm. long, about three-fourths as wide, the fiexuous 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 plaices in woods, 

 one-fourth mile east of hotel, Castle Crag. Shasta 

 County, California, by A. S. Hitchcock (^. 3070). 

 The specimen is a tuft of several branching culms. 

 This species is distinguished from P. ocddentale 

 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. 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, ^nd 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, 



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



strom 2636. 

 Washington: Falcon Valley, SuTcsdorf 124; Wena tehee, Whited 1249; Kittitas 



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



Kreager 325; Lake Chelan, Gorman 635; Klickitat County, Suksdorf <a2^2. 

 British Columbia: Vancouver 



Island, Canby 252, Rosendahl 



& Brand 107, Waldron 1921. 

 Oregon: Grants Pass, Piper 6493; 



Belknap Springs, Oorman 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- 



FiG. 242.— Distribution of P. paciflcum. 



ding. Heller 7S5Q; Yosemite Valley, Bolander 4840, Hall & Babcoch 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 G58Q; San Jacinto Mountains, Hall2244; Pine Ridge, Hall d: 

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

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

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



