32 



1891. British Columbia : Kicking Horse Lake, altitmle 1, 520 meters, (Macoun 

 20b), 1890. Washington : 3Iouut Adams, altitude 1,520 to 1,824 meters, (Suksdorf 

 115), 1885; Chiquash Mouataius, Skamania County, (Suksdorf 1023), 1890. 

 Related to C. canadensis and C. langsdorffii, differing Irom both in its stricter habit, 

 culms rarely branching from the upper nodes, sheaths almost always bearded at 

 junction with the blade, upper leaf surface usually conspicuously glaucous, 

 panicle narrow, contracted, with shorter, more nearly erect branches, callus 

 hairs shorter, and palea longer. From C. canadensis it is also distinguished by 

 its longer and stouter awn, and from C. langsdorffii by its paler color, merely 

 scabrous leaf-blades, straight or but slightly flexuous panicle and less scabrous 

 and thinner empty glumes. Forms intergrading with C. canadensis acuminata 

 occur, but the species is, on the whole, well marked. The type specimen repre- , 

 sents the extreme aud most distinct form. 



27. CALAMAGROSTIS ALASKAN A Kearney, sp. n. 



A strongly ca-spitose plant of rather soft texture, with numerous somewhat elon- 

 gated (often 1.5 dm.) erect innovations and tall culms from strong creeping 

 rootstocks. Culms 10 to 12 dm. high, erect but not strict, rather slender, rather 

 closely enveloped at base by numerous thin marcesceut sheaths; internodes 4, 

 the lowest very short, the others elongated and finally considerably exceeding 

 their sheaths, the uppermost exceeding both sheath and blade. Sheaths closely 

 embracing the culm nearly to their summit, usually somewhat twisted about 

 the culm, thin, glabrous, except the minutely scabrous margins. Ligule 2 

 to 4 mm. long, somewhat narrowed to the broad, rounded apex, thin but 

 firm. Blades 1 to 3 dm. long, 1.5 to 3.5 mm. wide, usually somewhat involute, 

 especially toward the filiform apex, strongly scabrous on the nerves and mar- 

 gins, sparsely short pubescent above. Panicle 10 to 16 cm. long, 2 to 3 cm. 

 wide, oblong-lanceolate, acuminate, erect,strongly-flexuou8, contracted, densely 

 flowered, light brown, sometimes tinged with pale purple; rachis rather slen- 

 der, scabrous, the lowest internode about 2 cm. long; branches slender, some- 

 what fiexuous, strongly hispidulous, the lower primary branches in 3's or 4's, 

 nearly erect or somewhat spreading, the longest 3 to 3.5 cm. long. Spikelets 

 about 4 mm. long. Empty glumes ovate-lanceolate, sharp-acuminate, rounded 

 on the back, thin but firm, scabrous on the nerves, elsewhere obscurely scabrous- 

 punctate to short-strigose, the first somewhat longer. Flowering glume nearly 

 1 mm. shorter than the second empty glume, ovate oblong, minutely 4-deutate, 

 thin-membranous with hyaline margins and tip, minutely scabrous on the back; 

 awn attached two-(ifths to three-fifths above the base, 1.5 to 2.5 mm. long, 

 slightly exceeding the glume, straight, erect, slender to rather stout. Palea 

 mostly two-thirds, sometimes three-fourths as loug as the fiowering glume, 

 ovate-oblong, bidentate, glabrous. Anthers about 2 nun. loug. Callus-hairs 

 copious, rather stiff, spreading, bright white, the longer considerably (some- 

 times 1 mm.) longer than the fiowering glume. Prolongation of the rachilla 

 with its hairs about equaling the longer ones of the callus. 



Allied to C. lapponica (Wahl.) llartm., from which it dillers in its more ca-spitose 

 habit, culms rather closely invested at base with numerous marcescent sheaths, 

 stouter rootstock, longer and firmer ligule, more involute leaf-blades, more llex- 

 uous, less interrupted, and more densely flowered panicle, broader, more 

 abruptly pointed, usually less scabrous empty glumes, straight awn and shorter 



palea. 

 Type specimen in the United States National Herbarium, collected along the Yukon 

 Kiver, Alaska, by Frederick Funstou (157), in August, 1893. 



U Callm-hairs sparse, much shorter than the glume. 



28. Calamagrostis cusickii Vasey, Monog. Grasses U. S., Coutr. U. S. Nat. Herb. 

 3: 81 (1«92). Deyeuxia cusickii Y&s.ey \ Coult. Bot. Gaz. 10: 224 (1885). 



