18 



mm. or usually much less in width, strongly involute and usually almost filiform, 

 strongly scabrous on the margins and upper surface, glabrous beneath. Panicle 

 6 to 10 cm. long, 1 to 2 <m. wide, dense, spike-like, somewhat interrupted toward 

 baso, pale^ purple, or greenish ; rachis slender, somewhat scabrous above, its 

 longest iuternode 1 to 2 cm. long; branches slender, hispidulous, erect and 

 appressed, the lower primary branches mostly in 5'8. Spikelets 8 to 10 mm. long. 

 Empty glumes narrow-lanceolate, gradually attenuate from the base to the sharp- 

 acuminate apex, thin, minutely scabrous, the first slightly longer. Flowering 

 "•lume about2 mm. shorter than the first empty one, lanceolate, acutish, minutely- 

 scabrous, of about the same texture as the empty glumes, the 4 lateral uerves 

 extended into straight, erect, very slender awns of une(iual length, the longest 

 1 to 2 mm.; dorsal awn attached about one-fifth above the base (but sometimes 

 as high as one-third), 10 to 15 mm. long, slender, bent near the middle, the upper 

 part much exserted and spreading at an angle of about 45 degrees. Palea four- 

 fifths to tive-sixths as long as the flowering glume (or occasionally nearly equal- 

 ing it) considerably narrower, acute, with nerves somewhat excurreut, nearly 

 glabrous. Callus hairs rather sparse, very unequal, the longer ones one-third to 

 one-h;ilf (usually one-half) as long as the flowering glume. Prolongation of the 

 rachilla with its rather copious hairs about equaling the palea. 

 California. 

 Type specimen in the United States National Herbarium, collected by H. X. Bolan- 



der (6470) in the Mattole district, Humboldt County. 

 C.foliosa is intermediate between C. howeUii and C. imrpurascens. From the former, 

 its nearest ally, it ditt'ers in its contracted, dense panicle and usually larger 

 spikelets. From C. imrpurascens it is easily differentiated by its slender, some- 

 what flexuous culms, very long and almost filiform leaf-blades, considerably 

 larger spikelets, much longer, more slender, less abruptly bent and nearly glab- 

 rous awn, prominent aristate teeth to the flowering glume and proportionately 

 Ifingcr callus hairs. 

 7. Calamagrostis purpurascens P. Br.; Richards, App. Frankl. Journ., 731 (1823). 

 Deyetixia liurpurasceus Kunth, Rev. Gram. 1: 77 (183.")). Calamagrostis sylvatica 

 A. Gray, Proc. Am. Acad. 6: 80(1860). Deyenxia s<ih-atica Vasey, Dcscr. Cat. 

 Grasses U. S., 51 (1885;. Calamatjroalis sylratlca amrricana Vasey, Monog. Grasses 

 U. S., Contr. Nat. Herb. 3: 83 (1892). C. syh-atica purpurascens Thurb. ; 

 Vasey, 1. c. 

 East (ireenlaud to Alaska, and .southward along the higher mountains to South 



Dakota, Colorado, and California. 

 Type specimen collected in the Barren Lands between Point Lake and the Arctic 



Sea by Dr. Richardson. 

 SPECIMEX.S EXAMINED.— G;<e«/((»f?; Disco (Warming, Th. Fries, Holm); (Weth- 

 erill 4), 1894. Ar die coast: (Richardson, 59, 62, 67, Herb. Hook.). Rocky Moun- 

 tains: Latitude 39 to 41 degrees (Hall and Harbour 624), 1862. South Dalota: 

 Black Hills, altitude 1,670 to 1,824 meters (Rydberg 1130), 1802. Assinihoia: 

 (Douglas). Montana: White Sulphur Springs, Belt Mountains, altitude 2,070 to 

 2,736 meters (Scribuer 362), 1883; Spanish Creek, Gallatin County (Tweedy 

 1022); Baldy Peak near Bozeman (Rydberg 2224; Shear 468), 1895; Belt Pass 

 (Rydberg 3313.^), 1N96; Barker, altitude 2,128 meters (Rydberg 3373), 1896; Black 

 Hawk (Rydberg 3296), 1896; Spanish Peaks, altitude 2,432 meters (Rydberg 

 3074), 1896; Belt Mountains (R. S. Williams 596), 1888. Wyominy: Laramie 

 Peak (A. Nelson 1627), 1895. Colorado: Denver (Coulter), 1873; (Wolf 398, 587), 

 1873; Pen Gulch (Vasey); Lake Ranch (G. H. French); Silver Plume, altitude 

 3,952 meters (Shear 691, 696; Rydberg 2470), 1895; Georgetown, altitude 2,512 

 meters (M. E. Jones 500), 1878; Georgetown (.«ihear 6M), 1895; Clear Creek 

 (Parry 365, 368), 1861; Pikes Peak (Canby, T. A. Williams 2170, 2188, 2188^), 

 1896;'Manitou, El Paso County, altitude 3,040 meters (Clements 42), 1896; 

 Colorado Mine (Rydberg 2380), 1895; Mount Princeton, altitude 3,344 meters 



