GRAMINE.E. (GRASS FAMILY.) 617 



spreading pedicels; flowering glumes ovate, acute, strongly 3-nerved, rough- 

 keeled. Dry sterile soil. August -Sept. Panicle l-l.i long. Leaves 

 and sheaths mostly clothed with long soft hairs. 



13. E. campestris, Trin. I'anicle 1- 2 long, the long scattered cap- 

 illary branches spreadiug, or the lower ones reflexed, the lower axils bearded; 

 spikelets linear, the lateral ones nmsily longer than their pedicels, 2" -4" 

 long, 6- 12-flowered; flowering glumes closely imbricate, acute, 3-uerved; 

 culms clustered; leaves 1 long. Low pine barrens, common. Oct. 



Var. refracta. Smooth throughout, or the sheaths of the short and rigid 

 leaves bearded at the throat ; panicle (6' - 1 !' long) with t he branches reflexed ; 

 spikelets sessile or nearly so, 1 5 - 20-flowered ; flowering glume faintly 3- 

 nerved. Dry soil, Middle Florida. 



66. 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. Flowering glume rather rigid, 

 strongly keeled, nerved, awuless, larger than the 2-keeled palea. Grain free. 

 Stamens 1 -3. 



* Spikelets long-pedicelled, drooping : glumes oppressed. 



1. U. latifolia, Michx. Culms 2 -3 high; leaves flat, lanceolate (|'~ 

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

 ered ; flowering glume one third longer than the palea, fringed on the keel, 

 acutish ; stamen 1. Banks of rivers in the upper districts. July -August. 



Spikelets 12"- 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 12-flowered; flowering glume serrulate on the keel; stamens 3. 



Drifting sands along the coast. July - August. Plant pale. Leaves 2- 

 4 long. 



* * Spikelets sessile or nearly so, erect : glumes at length spreading. 



3. IT. gracilis, Michx. Panicle long and slender, the branches appressed ; 

 spikelets small (2" -3" long), wedge-shaped, 4-6-flowered; flowering glume 

 longer than the palea, smooth on the keel, obtuse; stamen 1. Rich damp 

 soil. July - August. Culms slender, mostly erect, 2 - 4 long. Leaves 2" - 

 3" wide. Sheaths smooth. 



4. U. longifolia, Scribn. Culm stouter; leaves broader (4" -8" wide), 

 the sheaths pubescent; panicle more rigid; spikelets larger; otherwise like 

 the preceding. Low ground, Florida to Tennessee. July- Sept. 



5. U. nitida, Baldw. Panicle short, of few rigid spreading branches ; 

 spikelets (6"- 8" long) oblong, 6 - 8-flowered ; flowering glume as long as the 

 palea, acute, serrulate near the apex ; stamen 1. Swamps, Florida, Georgia, 

 and westward. August. Culms slender, 1 - 2 high. Leaves linear, smooth. 



