GRASS FAMILY. 



163 



36. CALAMAGROSTIS Adans. Fam. PI. a: 31. 1763. 



[DEYEUXI A Clarion; Beauv. Agrost. 43. //. p. /. p, /o. i8ir] 



Generally perennial grasses, of various habit, with flat leaves and paniculate inflorcaccnce. 

 Spikelets i-flowered, the rachilla usually prolonged beyond the flower and nnbiacmL 

 Scales 3; the 2 outer empty, carinate, membranous; the third Kale hyaline, shorter than 

 the outer, obtuse, usually copiously long-hairy at the base, or rarely the hair* scanty or abort, 

 and bearing a straight, bent or twisted dorsal awn; palet shorter, .> nerved. Stamen* j. 

 Styles short, distinct. Stigmas plumose. Grain free, enclosed in the Male. Seed adher- 

 ent to the pericarp. [Greek, signifying Reed -grass.] 



A genus of about 130 species, widely distributed throughout temperate and _ 

 regions, and particularly numerous in the Andes. Besides the following. Mime x> others occvr in 

 the western parts of North America. The English name Small-reed is .. ; 



Panicle open, the branches spreading or ascending, usually long and lax. 



Spikelets i" long; outer scales acute. i c. Jfitoimiam* 



Spikelets iH"-2 long; outer scales acute ; awn slender. 



Spikelets 2" -3" long; outer scales acuminate ; awn stouti-r. ! amgidorfki. 



Panicle narrow or contracted, the branches erect, at least in fruit, usually short and strict. 

 Basal hairs one-third the length of the scale or h -- - 



Awn strongly twisted, inserted near the base of the scale; leaves long. 4. C. flfrt 

 Awn not twisted, bent, inserted just below the middle of the scale; leaves short. 



5- C. 



Basal hairs one-half the length of the scale or more. 



Spikelets i H"-2" long; prolongation of the rachilla hairy its whole length. 



Leaves flat; basal hairs equalling or somewhat shorter than the scale. 6. C. (" 

 Leaves involute in drying; basal hairs half as long as the scale. 

 Spikelets 3" -4" long; prolongation of the rachilla with a terminal tuft of 



5. C . 



i. Calamagrostis Macouniana Vasey. 

 Macoun's Reed-grass. (Fig. 372.) 



Deyeuxia Macouniana Vasey, Coult. Bot Ga*. M: *fi. 



1885. 



Calamagrostis Macouniana Vasey, Cntr 

 Herb. 3:81. 1892. 



Culms 2-3 tall, erect, simple, smooth and glabrooa. 

 Sheaths shorter than the intemodes; ligule i" long; 

 leaves s'-f long, i"-2#" wide, erect, acuminate, 

 scabrous; panicle open, 3'~4 ',' in length, the branches 

 ascending, or sometimes erect, the lower I'-i V Jong, 

 naked at the base; spikelets i" long, tin- outer scale* 

 acute, scabrous, the first shorter than the second; 

 third scale equalling the second, the awn a little ex- 

 ceeding it; basal hairs about as Jong as the Kale. 



Manitoba and Assiniboia. Sum- 



2. Calamagrostis Canadensis (Michx.) Beauv. 



(Fig. 373-) 



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

 Calamagroslis Canadensis Beauv. Agrost. 15. 1812. 



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

 . scabrous. Sheaths shorter than the internodes; ligule 

 i"-3" long; leaves 6'-i long or more, \"-\" wide, 

 rough; panicle 4 / ~7 / in length, open, usually purplish, 

 the branches spreading or ascending, the lower 

 i^/_ 3 / long, naked at the base; spikelets i#"- 

 2" long, the outer scales equal or subequal, acute, 

 strongly scabrous; third scale equalling or slightly 

 shorter than the second, scabrous, 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 Alaska, 

 south to North Carolina, New Mexico and California. 

 Ascends to 5000 ft. in the Adirondacks. July-Sept. 



Blue-joint Grass. 



