158 BOTANY. 
very unequal, lanceolate, sharply carinate, each terminating in a bristle as long as itself, 
Dale somewhat coriaceous, linear-lanceolate, almost terete, long as the upper glume; the 
inferior acute, rough on the keel; superior pubescent on the back, with two approximate nerves, 
which are produced into teeth at the summit. Stamens 3; ——— linear. Styles long ; stig- 
mas plumose on the inside. Caryopsis linear-fusiform, 
MONROA. Nov. Gen. 
Spzecule 2-6-flor ; flores sessiles distichi hermaphroditi v. terminali tabescente. Glume 2, 
suboppositee mucronate, flores multobreviores. Palew 2 herbaece rigide, inferior apice 
mucronata vel Dier insit aristata, ecarinata, «equilatera, lateribus in spicule Superiores versus 
basim baribatis, in spicula infima plerumpue glabris. Caryopsis glaberrima, palea superiori 
obtecta. "Gesuch annuum, repens, ramosissimum, ramis fasciculatis. Spica capituleformi 
ssepius foliorum tdcminali din | sdfd ds Spiculee 3, 2-0-۰ 
”MoNROA SQUARROSA. Crypsis squarrosa, Nutt. Gen. 1, p. 49. Hills and ravines, Anton Chico, 
New Mexico; September. ‘‘On the arid plains of the Upper Missouri, near the Grand 
Detour, it covers, almost exclusively, thousands of acres." "— Nutt. This grass is very distinct 
from Crypsis, and belongs, as we think, to the tribe Hordeaces. In the notice of Dr. James’ 
plants, collected in Long's 1st expedition, (Ann. Lye. Nat. Hist. N. York, 2, p. 254,) it was 
intimated that it was probably a distinct genus. "The culm is prostrate, much branched from 
the base ; the branches 3-8 inches long. Leaves 1-2 inches long, flat, 1-2 lines wide, somewhat 
pungent, scabrous on the margin ; those near the summit of the 0 branches with broad 
sheaths, embracing the small sessile heads, which thus appear involucrate.  Spikelets 
mostly 3, closely approximated, usually 3d ول‎ Glumes sometimes almost unilateral, 
linear-lanceolate, carinate. Palez 2-3 times longer than the glumes, lanceolate, acute; the 
lower one often bifid or 2-toothed at the summit, with a cusp or very short rigid bristle between 
the teeth, 3-nerved ; the lateral nerves nearly marginal. In the uppermost spikelet, and often 
in the middle one, these nerves are bearded with long white hairs towards the base; but the 
flowers of the lowest spikelet are usually quite naked. Superior palea bicarinate, rather obtuse. 
Stamens 3; anthers linear. Styles long and slender ; stigmas plumose. Achenium compressed, 
very pner and even, usually covered with the introiloted margin of the superior palea. We 
dedicate this singular genus to Major Monro, of the East India Company 8 service, who has made 
the grasses an especial study. ۱ 
TRITICUM (AGROPYRUM) REPENS, Linn. Prairies, on the Canadian River; August. An awn- 
less glabrous form, with narrow and somewhat involute leaves. 
SETARIA GLAUCA, Beauv. ; Kunth, Enum. p. 149. سو‎ of Little Indian — : 
August. 
ee vinIDIS, Beauv. ; Kunth, l. c. p. 151. Laguna Colorado, New Mexico; August. 
PANICUM Crus-Gaztr, Linn. Oplismenus Crus-Galli, Kunth, l. c. 1, p. 143: With the last; 
also ón the banks of the Pecos, New Mexico. All the specimens from the latter locality 
belong to the awnless variety. ۱ | 
PANICUM vIRGATUM, Linn.; Kunth, l. c. p. 100; Torr. FT. N. Y. 2, p. 425. With the last. 
PANICUM SANGUINALE, EN Torr. Ce p. 423. 'Alluvial thinks of the Canadian, and near 
Galisteo, New Mexico ; Augnst—October. 
PANICUM LATIFOLIUM, Linn.; Torr.l.c. p. 425. With the tádt. ; 
PANICUM OBTUSUM, H. B. K. ? Torr.in Marcy's Rep. p. 299. Plains, Laguna Colorado, New 
Mexico; September. .— ۱ 
CENCHRUS TRIBULOIDES, Linn. ; Torr. Fl. New York, 2, p. 931. On the Canadian River, and 
near Galisteo, New Mexico ; October. 
DACTYLOIDES, Ein, Micha. Fl. 1, p. 60. Pecan creek, Indian Territory. T. 
