81 
10. C. Cusickii Vasey. Bot. Gaz. x. p. 223. Culms 3 to 4 feet high, erect from 
creeping rhizoma, smooth, nodes about 3, distant; radical tufts, numerous, with 
flexible cvrving leaves one-third as long as the culm; sheaths smooth, 4 to 5 inches 
long, the upper one 7 or 8 inches; ligule conspicuous, 2 to 4 lines long, mem- 
branaceous; panicle 6 inches long, erect, rather close, ~ to 14 inches wide, the 
branches whorled, numerous, mostly short, and flowering to the base, the longer 
ones 1 to 1} inches long, densely flowered, the lower whorls about 1 inch distant; 
spikelets closely approximated, very short, pediceled; outer glumes about 2 lines 
long, acute or acuminate, smooth, rather thin; the lower one l-nerved, the upper 
3-nerved and a little shorter; flowering glumes nearly as long as the outer ones, 
narrowly lanceolate, acuminate, smooth, thiunish, 5-nerved, bifid at the apex; awn 
erect, inserted a little below the middle, slightly exceeding its glumes; palet nearly 
equaling the glume, membranaceous; hairs scanty, one-half.to two-thirds as long as 
the flower; near C, Aleutica, but distinguished by rather smaller and more crowded 
spikelets and longer awns.—In the Eagle Mountains (W. C. Cusick) and eastern 
Oregon, at an altitude of 5,000 to 6,000 feet, growing in the shade of Pinus contorta, 
very conspicuous, but rarely sending up culms. 
11. C. Pickeringii Gray. (Gray’s Manual, 6th ed., p. 651.) Culms 1 to 1} feet high ; 
jieaves short, erect, rather rigid; panicle lanceolate, or pyramidal, purplish; empty 
glumes ovate-oblong to ovate-lanceolate, bluntish or abruptly pointed, 14 to 2 lines 
long, thickish; floral glume nearly as long, acute, bearing below the middle a short 
stout awn slightly longer than the glume, hairs of the callus and rudiment very short 
and scant, } or + the length of the glume.—White Mountains, New Hampshire, and 
Vermont (Pringle). 
12, C. Porteri Gray. (Gray’s Manual, 6th ed., p. 650.) Culm slender, 2 to 4 feet high; 
leaves 6 to 10 inches long, scabrous below, tapering to a long slender point, ligule 
2 lines long, lacerate; a pubescent or woolly ring at the junction of the sheath 
and leaf on the back; panicle long and narrow, the rays appressed; empty glumes 
lanceolate, rather unequal, acute, pale, 2 to 24 lines long; floral glume as long as 
the upper empty one, firm, membranaceous, bearing below the middle a stoutish, 
twisted awn of its own length, hairs of the callus scanty, less than half as long as 
the glume, those of the rudiment half as long as the glume.—Dry woods, Pennsyl- 
vania (Porter), to New York (Dudley). 
13. C. Macouniana Vasey. (Bot. Gaz., x. p. 297, as Deyeuria.) Culms 2 to 3 
feet high, erect, somewhat branching below, slender, leafy; leaves narrow, flat, 6 to 
10 inches, alternate, pointed, ligule short, lacerate ; panicle 3 to 4 inches long, lan- 
ceolate or pyramidal, open, the rays mostly in fives, approximate, slender, erect, 
naked below, spikelets somewhat crowded at the upper part of the branches, little 
more than 1 line long; the empty glumes nearly equal, purplish, ovate-lanceolate, 
acute, finely scabrous on the back ; floral glumes equal to the empty ones, ovate-ob- 
long, somewhat truncate, and 2-lobed at the apex, the lobes finely denticulate, with 
an awnabove the middle, straight, reaching to the apex; palet one-third shorter 
than its glume, bifid and denticulate at the apex; hairs copious, as long as the 
flowering glume.—Northwest Territory, British America (J. Macoun, for whom it is 
named). In this species the flowers are smaller than those of any other of our species. 
14. C. strigosa Wahl. (Arundo strigosa Wahl.) has been attributed to Alaska, 
but the description of Bongard, in the *‘ Vegetation of Sitka” does not agree with 
Wahlenberg’s figure in Flora Lapponica, The plant referred to C. strigosa by Dr. 
Thurber, collected by Mr. Harrington in Alaska, hasa large panicle, the empty glumes 
21 to 3 lines long, terminatirg in a long subulate point, strigosely-pubescent all 
over, especially so on the keel; the floral glume little ghorter, acuminate, with the 
awn attached considerably below the middle, exserted, and equaling or slightly ex- 
ceeding the glume; hairsof callus and rudiment copious, and about one-third shorter 
than the floral glume. In appearance like a large C. Langsdorji,—Alaska. 
12971—No. 16 [Feb. 25, 1892.] 
