434 
31. Calamacrostis Coarctata. Torrey. 
Stn. —C. Canadensis, Kutt. Agrostis glauca, MuLl. Arundo coarc- 
tata, Turr. 
Panicle contracted, dtnse ; lower palea shorter than the taper pointed 
tips of the lanceolate glumes, almost twice the length of the hairs (ex¬ 
cepting the strong tuft home by the conspicuous rudiment) bearing a 
rigid and txserted short av\n above the middle; grain hairy, crowned 
with a bearded tuft. Wet grounds. Perennial ; flowers in August* 
Culms 3 to 6 feet high. Michigan, and Lake Superior ; also in Minne¬ 
sota. (Dr. D. Houghton.) 
■ 32. Calamagrostis Longifolia. Hooker. 
Culm stout from thick running root-stocks; leaves rigid, elongated, 
involute above and tapering into a long thiead like point ; branches of 
the pyramidal panicle smooth ; glumes lanceolate, the upper as long as 
the similar paleae, the lower one-fourth shorter ; the copious hairs more 
than halt the length of the naked paleae; sheaths clothtd with deciduous 
wool. Kandy coast of Lake Superior. Perennial. Culms 1 to 4 feet 
high. 
33. Calamagrostis Arenaria. Trinius. 
Stn. —Arundo arenaria, Linn. Psamma littoralis, Beauv. P. arena- 
ria, R. & Sell. Ammophila aiundinacea, Host. Sea reed, sand reed. 
Culm rigid, from stout running root-stocks; leaves long, soon involute; 
panicle contracted into a dense cylindiieal spike ; hairs only half the 
length of the paleae ; glumes acute. Perennial ; flowers in August. 
Culms 2 to 3 feet high! Sandy sea and lake beaches. Lake Superior, 
(W. D. Whitne) ) ; also on the sea coast, and in Europe. 
The long spreading roots of this coarse and rank grass, by extending 
themselves in the loose sand, prevents its removal by the wind ; and they 
are employed in some sandy districts lor this purpose. 
TRIBE IV. STIPACE^E. 
Inflorescence panicled, or racemose; spikelets solitary, one-flowered, usually 
large; glumes membranaceous; paleae mostly two, lower one coriaceous, invo¬ 
lute, 1 to 3-awned, closely inclosing the upper and the graiu; scales mostly 
three. 
