GENUS 45. 



GRASS FAMILY. 



209 



4. Calamagrostis perplexa Scribn. Wood Reed- 

 grass. Fig. 503. 



C. nemoralis Kearney, Bull. U. S. Dept. Agric. Agrost. n : 



36. 1898. Not Philippi, 1896. 

 Calamagrostis perplexa Scribn. Circ. U. S. Dept. Agric. 



Agrost. 30: 7. 1901. 



Culms 3-5 tall, erect; leaf-sheaths glabrous, ex- 

 cepting the usually pubescent summit; blades flat, 

 rather thin, rough, sometimes glabrous on the upper 

 surface, lax, up to i long, ii"-3" wide; panicle 3'-s' 

 long, i'-i' wide, contracted, acute, its slender, some- 

 what flexuous hispidulous branches erect or nearly so; 

 spikelets ii"-2" long, the empty scales lanceolate to 

 oblong-lanceolate, acuminate, sometimes keeled, the 

 flowering scale ovate-oblong, about as long as the 

 second empty scale, obscurely toothed at the apex or 

 entire, rather firm, the awn attached near the base and 

 extending somewhat beyond the scale, stout, bent near 

 the middle, somewhat twisted at the base, the callus 

 hairs white, about three-fourths as long as the scale. 



In dry rocky woods, Maine and western New York. 



5. Calamagrostis Langsdorfii (Link) Trin. 

 Langsdorf's Reed Bent-grass. Fig. 504. 



Arundo Langsdorfii Link. Enum. i : 74. 1821. 



C. Langsdorfii Trin. Unifl. 225. pi. 4. f. 10. 1824. 



Culms 2-4 tall, erect, simple, smooth or roughish. 

 Sheaths shorter than the internodes; ligule i"-3" long; 

 blades 4'-i2' long, 2"-4" wide, scabrous ; panicle 2'-6' 

 in length, the branches ascending or sometimes erect, 

 the lower i'-2' long, naked at the base; spikelets 2"-$" 

 long, the outer scales acuminate, strongly scabrous ; 

 third scale equalling or shorter than the second, sca- 

 brous, the stout awn as long as or a little exceeding the 

 copious basal hairs which are usually somewhat shorter 

 than the scale. 



In meadows and on rocks, Greenland to Alaska, south 

 in the mountains to North Carolina, Michigan, New Mexico 

 and California. Also in northern Europe and Asia. 

 Purple-top. Northern blue-joint. Summer. 



6. Calamagrostis canadensis (Michx.) Beauv. Blue-joint Grass. Fig. 505. 



Arundo canadensis Michx. Fl. Bor. Am. i : 73. 1803. 

 Calamagrostis canadensis Beauv. Agrost. 15. 1812. 

 C. canadensis acuminata Vasey, Bull. U. S. Dep. Agr. 

 Agrost. 5: 26. 1897. 



Culms 2-5 tall, erect, simple, smooth or somewhat 

 scabrous. Sheaths shorter than the internodes ; ligule 

 i "-3" long; blades 6'-i long or more, i"-4" wide, 

 rough; panicle 4'-? in length, open, usually purplish, 

 the branches spreading or ascending, the lower ii'-3' 

 long, naked at the base; spikelets ii"-2" long, the outer 

 scales equal or subequal, acute, strongly scabrous; third 

 scale equalling or slightly shorter than the second, sca- 

 brous, the awn delicate and equalling the copious basal 

 hairs which are about as long as the scale or some of 

 them shorter. 



In swamps and wet soil, Newfoundland to British Co- 

 lumbia, south to North Carolina, New Mexico and Cali- 

 fornia. Ascends to 5000 ft. in the Adirondacks. Blue- 

 stem. July-Sept. 



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