566 GRAMINEJE, (GRASS FAMILY.) 
35. BROMUS, L. Brome-Grass. 
Grasses with flat leaves, and long-stalked spikelets in loose panicles. Spike- 
lets large, 3-many-flowered. Glumes membranaceous, unequal, commonly 
keeled. Lower palea usually awned under the apex, convex on the back, about 
7-nerved at the base. Stamens 3. Grain flattened and grooved on the inner 
face, and adherent to the upper palea. 
1. B. ciliatus, L., var. purgans, Gray. Perennial; panicle diffuse, the 
slender drooping branches mostly by pairs; spikelets lanceolate after flowering, 
10-12-flowered ; lower glume 1-nerved, the upper 3-nerved ; lower palea convex 
on the back, 7-nerved, hairy, about as long as the awn; culms 2°-4° high; 
leaves and sheaths smooth or downy. — River-banks and rich soil, Florida, and 
northward. June. 
2. B. secalinus, L. (Cuear or Cuess.) Annual; panicle spreading, 
with clustered, at length drooping branches; spikelets (1/— 1' long) 8 - 10-flow- 
ered, oblong-ovate ; lower glume 5-nerved, the upper 7-nerved ; palew smooth, 
the lower one convex, 7-nerved, awnless or short-awned ; culms 19 - 2° high; 
leaves and sheaths smooth or downy. — Grain-fields, &c. Introduced. 
36. UNIOLA, L. 
Tough perennial grasses, with erect culms, from creeping rootstocks, and 
mostly broad, flat many-flowered spikelets, in erect or drooping panicles, with 
one or more of the lower flowers glume-like and neutral'and the upper imper- 
fect. Glumes lanceolate, compressed-keeled. Lower palea rather rigid, strongly 
compressed-keeled, nerved, awnless, much larger than the 2-keeled upper one. . 
Grain free. Stamens 1- 3. 
~ Spikelets long-pedicelled, drooping : flowers appressed. 
1. U. latifolia, Michx. Culms 29-3? high ; leaves flat, lanceolate (J^ 
1’ wide); panicle loose, drooping; spikelets green, oblong, acute, 10- 15-flow- 
ered ; lower palea one third longer than the upper, fringed on the keel, acutish ; 
stamen 1.— Banks of rivers, Florida, and northward. July and Aug. — Spike- 
lets 12" - 15" long. 
2. U. paniculata, L. Culms stout, 39 - 59 high; leaves very long, rigid, 
soon convolute; panicle crowded, drooping ; spikelets whitish, oblong-ovate, 
about 12-flowered ; pale equal, the lower one notched at the apex, serrulate on 
the keel; stamens 3. — Drifting sands along the coast, West Florida, and north- 
_ ward. July and Aug.— Plant pale. Leaves 2°- 4° long. 
_ ihe ee Spikelets sessile or nearly so, erect: flowers at length spreading. 
Wood uk DS gracilis, Michx. Panicle long and slender, with the branches ap- 
pressed; spikelets small (27 3"), wedge-shaped, 4- 6-flowered ; lower palea 
i ‘Upper one, smooth on the keel, obtuse; stamen 1. — Rich damp — 
rd. July and Aug.— Culms slender, mostly erect,- 
