650 GRAMINEJE. (GRASS FAMILY.) 



rhachis about equalling the flowering glume, not surpassed by those of the 

 rudiment; awn delicate, straight. 



1. C. Canadensis, Beauv. (BLUE-JOINT GRASS.) (PI. 8, fig. 1, 2.) 

 Culm tall (3-5 high); leaves flat when fresh, glaucous; panicle oblong; 

 glumes ovate-lanceolate, acute, 1^- H" long; awn from near the middle of the 

 upper glume, not exceeding and scarcely stouter than the basal hairs. (Dey- 

 euxia Canadensis, Hook.f.) Wet grounds ; common northward. July. 



2. C. Langsdorffii, Trin. Spikelets larger, 2 - 3" long ; glumes lanceo- 

 late or oblong-lanceolate and gradually taper-pointed ; awn stouter ; otherwise 

 like the preceding. (Deyeuxia Langsdorffii, Kunth.) Mountains of N. New 

 Eug., L. Superior, and northward. (Eu.) 



* * Panicle strict, its short branches oppressed or erect after flowering, and the 

 glumes mostly closed ; flowering glume less delicate, roughish, sometimes of as 

 Jinn texture as the lower ; awn stouter. 



i- Leaves narrow, inclined to be involute ; awn straight. 



3. C. Stricta, Triu. Panicle glomerate and lobed, strict, 2-4' long; 

 glumes H-2" long, ovate-oblong, not acuminate; hairs scarcely or little 

 shorter than the flower, and as long as those of the rudiment ; awn from the 

 middle of the thin flowering glume or lower, and barely exceeding it. (Dey- 

 euxia neglecta, Kunth 1) Mountains of N. New Eng., Lake Superior, and 

 north and westward. (Eu.) 



4. C- Lapponica, Trin. Culm and rootstocks stouter than in C. stricta; 

 the narrow panicle less dense, and purplish spikelets larger ; glumes fully 2" 

 long, tapering to a point ; awn from much below the middle of the glume, 

 stout. (Deyeuxia Lapponica, Kunth.) Isle Eoyale, Lake Superior, to Lab., 

 north and westward. Aug. (Eu.) 



H- *- Leaves broader, flat ; awn stouter, bent, divergent, or twisted ichen dry. 



5. C. confinis, Nutt. Tall; panicle elongated (4-6'), its rather slender 

 branches spreading at flowering-time, afterward appressed ; glumes lance- 

 oblong, very acute, 2" long, pale ; hairs of the flower copious, equal, slightly or 

 one third shorter than the thin flowering glume and than those of the rudi- 

 ment ; awn borne much below the middle of the glume, somewhat surpassing 

 it; grain glabrous. (Deyeuxia confinis, Kunth.) Swamps, N. and W. New 

 York (especially Penn Yan, Sartwell) and Penn. ; Minn., and westward. July. 



6. C. Nuttalliana, Steud. Culm stout (35 high); panicle contracted 

 and spike-like ; glumes lanceolate and tapering into slender awl-shaped tips, 

 3" long; hairs on the lower side scanty and barely half the length of the firm 

 and keeled flowering glume, on the other side longer and equalling the copious 

 tuft on the summit of the rudiment ; awn borne half-way between the middle 

 and the tapering tip of the glume, stout, not twisted ; grain bearded at the top. 

 (Deyeuxia Nuttalliana, Vaseu.) Moist grounds, E. New Eng. to Peun., Va., 

 and southward. Aug. 



7. C. Porteri, Gray. Culm slender (2 - 4 high) ; a woolly-bearded ring 

 at the junction of the broadly linear leaves with the sheath ; panicle long and 

 narrow, with the branches appressed ; glumes lanceolate, acute, pale, 2 - 2|" 

 Ion""; hairs of the flower and of the short rudiment scanti/, and both reaching 

 about to the middle of the flower behind the palet, but very short or none at the 



