MANUAL OF THE GRASSES OF THE UNITED STATES 



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long as the glumes, smooth, thin in 

 texture, the awn delicate, straight, 

 attached just below the middle and 

 extending to or slightly beyond its 

 tip, the callus hairs abundant, about 

 as long as lemma; rachilla delicate, 

 sparsely long-pilose. % — Marshes 

 wet places, open woods, and mead- 

 ows, Greenland to Alaska, south to 

 West Virginia and North Carolina 

 (Roan Mountain), Missouri, Kansas, 

 to New Mexico and California. A 



proves to be an Old World species 

 not found in America. 



Calamagrostis canadensis var. 

 macouniana (Vasey) Stebbins. (Fig. 

 443, C.) Differing from C. canadensis 

 in the smaller spikelets, about 2 mm. 

 long. Scarcely a distinct variety. % 

 — Saskatchewan (Macoun 44, 45), 

 Minnesota (Bemidji), South Dakota 

 (Chamberlain, Redfield), Iowa, Ne- 

 braska (Central City), Missouri (Lake 

 City, Little Blue), Montana (Man- 



Figure 444. — Calamagrostis lactea. Panicle, X 1; glumes and floret, X 10. (Dupl. type.) 



widely distributed and exceedingly 

 variable species. Characters used to 

 differentiate the many proposed va- 

 rieties are not correlated in the larger 

 proportion of specimens. The panicle 

 varies in density and the glumes in 

 size and scabridity. The following 

 varieties are recognizable but are 

 connected with the species by many 

 intergrading specimens. 



Calamagrostis canadensis var. 

 scabra (Presl) Hitchc. (Fig. 443, B.) 

 Differing in having spikelets 4.5 to 

 6 mm. long, the glumes rather firm, 

 hispidly short-ciliate on the keel, 

 strongly scabrous otherwise, but the 

 greater scabridity not constant. % 

 — Mountains of New England, New 

 York, and northward, and along the 

 Pacific coast from Washington to 

 Alaska. This form has been referred 

 to C. langsdorfti (Link) Trim, which 



hattan) , Yellowstone Park, Washing- 

 ton (Spokane County), Oregon (Crook 

 County). 

 22. Calamagrostis lactea Beal. 



(Fig. 444.) Culms ascending, 80 to 

 150 cm. tall, weak, the nodes sub- 

 geniculate, with a short knotty rhi- 

 zome; sheaths scaberulous; ligule 

 rather firm, 3 to 5 mm. long; blades 

 elongate, flat, lax, scabrous, 6 to 12 

 mm. wide; panicle pale, narrowly 

 pyramidal, 12 to 20 cm. long, loosely 

 flowered; glumes 5 to 6 mm. long, 

 scabrous, acuminate; lemma shorter 

 than the glumes, scabrous, the apex 

 setaceous-toothed, the awn attached 

 near the base, about equaling the 

 lemma, weakly geniculate; palea slight- 

 ly exceeding the lemma, the cal- 

 lus hairs about half as long; ra- 

 chilla minute, sparsely pilose. % 



