5G6 GRAM1NF.,«. (ORASS FAMILY.) 



35. BROMUS, L. Buome-Gr.vss. 



Grasses with fliit k-avt-s, and long-stalkcd spikt-lcfs in loose panicles, Spik& 

 lets lar^'e, :i - inaiiy-flowcixd. (iluines membranaceous, unequal, commonly 

 keeled. Lower palea usually awned under the apex, convex on the back, about 

 7-iicrved 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 

 sk'iidir (hooping l)ranches mostly by jjairs ; spikelets lanceolate after flowering, 

 10-1 2-flowered ; lower glume l-ncrved, the upper 3-nei-ved ; 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. — Kiver-banks and rich soil, Florida, and 

 northward. June. 



2. B. secalinus, L. (Cheat or Chess.) Annual; panicle .spreading, 

 ■with clustered, at length drooping branches ; spikelets (i'- 1' long) 8 - 10-flow- 

 cred, oblong-ovate ; lower glume 5-nerved, the upper 7-nerved ; palea; smooth, 

 the lower one convex, 7-nerved, awnless or shoit-awned ; culms l°-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 glumc-like and neutral, and the upper imper- 

 fect. Glumes lanceolate, compressed-keeled. Lower palea rather risrid. stronglv 

 compressed-keeled, nerved, awnless, much larger than the 2-keeled upper one. 

 Grain free. Stamens 1-3. 



* Spikelets long-pcdicelled, droojiing : flowers oppressed. 



1. TJ. latifolia, Michx. Culms 20-3° high ; leaves flat, lanceolate (|'- 

 1' wide) ; panicle loose, drooping; spikelets green, oblong, acute, 10- 15-flow- 

 ered ; lower paica one third longer than the upper, fringed on tlie keel, acutish ; 

 stamen 1. — Banks of rivers, Florida, and northward. July and Aug. — Spike- 

 lets I2''-15" long. 



2. U. paniculata, L. Culms stout, .3° -5° high ; leaves very long, rigid, 

 soon convolute ; panicle crowded, drooping ; spikelets whitish, oblong-ovate, 

 about 1 2-flowered ; paloae 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. 



* * Spikelets sessile or nearly so, erect : flowers at lenqth spreading. 



3. TJ. gracilis, Michx. Panicle long and slender, with the branches ap- 

 pressed ; spikelets small (2"- 3"), wedge-shaped, 4 - 6-flowered ; lower palea 

 longer than the upper one, smooth on the keel, obtuse; stamen \. — Rich damp 

 soil, Florida, and northward. July and Aug. — Culms slender, mostly erect, 

 2° - 4° long. Leaves 2" - 6'' wide. Sheaths smooth or downy. 



