582 
GRAMINEJE. (GRASS FAMILY.) 
1. C. Canadensis, Beauv. Panicle oblong, loose (often pur¬ 
plish) ; lower palea nearly as long as the lanceolate acute glumes, not 
exceeding the very fine hairs , bearing an extremely delicate awn below 
the middle scarcely equalling or exceeding the hairs; rudimentary 
pedicel minute. (Artindo Canadensis, Michx. C. Mexickna, Nutt.) 
— Wet grounds, common northward. July. — Rather glaucous, 2P- 
5° high : leaves flat. Glumes rough, 14" long. 
2. C. COnfiniS, Nutt. Panicle elongated, narrow (5'-8' long), 
the branches appressed after flowering, pale; lower palea nearly equal¬ 
ling the oblong-lanceolate acute glumes , | longer than the hairs (except¬ 
ing those of the conspicuous rudiment), bearing between the middle and 
the base a rather stout and slightly exserted awn. (Ar. confinis, tVilld.! 
C. inexpdnsa, Gray.) —Swamps, N. and W. New York (especially 
Penn Yan, Sartwell) and Pennsylvania. July. — Spikelets rather lar¬ 
ger than in the last; upper glume more or less shorter. 
3. C. coarctata, Torr. Panicle contracted, dense (3'-6 / 
long) ; lower palea shorter than the taper-pointed tips of the lanceolate 
glumes , almost twice the length of the hairs (excepting the strong tuft 
borne by the conspicuous rudiment), bearing a rigid and exserted 
short awn above the middle. (C. Canadensis, Nutt.) —Wet grounds, 
chiefly southward. Aug. — Culm 3°-5° high. Glumes 4" long. 
Grain hairy, crowned with a bearded tuft. 
4. C. sylvatica, DC., var. breviseta. Panicle dense and 
narrow (3 ; -5' long, purplish); pale® nearly equal, rather shorter than 
the ovate-lanceolate acute glumes; awn inserted between the middle 
and the base 1 stout , bent , not exceeding the glumes ; hairs very short 
and scanty , | the length of the pale®, half as long as the small rudi¬ 
ment. (Arundo sylvatica p. Wahl.) — Alpine tops of the White 
Mountains, New Hampshire. Sept. — Culms 1° high : leaves short 
and flat. Spikelets larger than in C. stricta, smaller than in C. pur- 
purascens, which has much longer hairs and rudiment, a long awn, <&£• 
§ 2. Calamovilfa. Glumes and equal paleae rather chartaceous , com¬ 
pressed-heeled ; the lower glume shorter than the upper and shorter 
than the palece , of which the lower is 1-nerved and entirely awnless; 
the upper strongly 2-keeled: rudiment wanting: panicle open and 
loose. 
5. C* brevlpilis. Branches of the diffuse pyramidal panicle 
capillary (purplish) ; glumes ovate , mucronate ; the upper a little 
shorter, the lower nearly one half shorter, than the palea , which are 
above twice the length of the hairs and bristly-bearded along the keels. 
(Arundo brevipilis, Torr.) —Sandy swamps, Pine barrens of ^ew 
Jersey, rare. Sept. — Culm slender, 3P-4 3 high : leaves nearly flat. 
6. €• longifolia, Hook. Culm ( 1 °- 4 ° high) stout, from thick 
running rootstocks; leaves rigid , elongated , involute above and taper- 
