274 MONOCOTYLODENOUS. 



1 A Fallens. Stem ereci, geniculate at the base, glabrous. Leaves flat* 

 slightly scabrous, narrow. Sheaths glabrous. Glumes compressed, keeled* 

 the interior valve longest. Valece 2, the exterior double the length of the in- 

 terior, bearing a short awn on the back. 



% March — April. Wet soils, common. 1-2 ft. 



2 A. Flexuosa. Stem erect, lerete, glabrous. Leaves setaceous. Ta,iicle 

 diffuse, with the branches somewhat verti-cillate. Glumes unequal. Palea 

 equal, the exterior one pubescent at the base, bearing an awn at the base. 



% August— Sept. Shady woods. 1-2 ft. 



3 A Purpurea. -S^ewi slender, compressed, scabrous at the joints. Leaves 

 scabrous, pubescent on the upper surface. Sheaths scabrous, the throat pu- 

 bescent. Glumes 2-flowered, tne exterior valves small, with the margins in- 

 cised. Falece 2, the exterior one bifid, with the midrib extending into an 

 awn, the interior valve villous. 



O Sept.— Oct. Sea coast. 1-2 ft. 



4 A Capillacea. Stem erect, small. Leaves short, glabrous, narrow. 

 Flowers in capillary panicles, diffuse, large for the size of the plant. Glumes 

 acute, with the keel rough. Valece unawned, larger than the glumes. 



O Ju'y — Aug. Sandy soils. 8-10 in. 



5 A Triflora. Stem erect, glabrous, slender Leaves short, flat, scab- 

 rous on the under surface. Sheaths shorter than the joints with incised stip- 

 ules. GZumes unequal, hnear lanceolate, keeled. PoZet? lanceolate, 3-5-nerved. 



% April— May. Upper Car. & Ga. 12-18 in. 



6 A Obtusata. Stem erect, glabrous. Leaves flat, somewhat scabrous 

 and liairy. Sheaths hairy. Panicle racemose. Glumes 2-3-flowered, the ex- 

 terior one linear, the interior broad, obtuse. FaletB nearly equal, the exterior 

 tinged with green, the interior white. 



% March — April Pine barrens, common. 



7 A MoLLfs. Stem slender, glabrous, naked at the summit. Leaves lin- 

 ear, short. Flowers in racemose panicles, scattered. Glumes with the inte- 

 rior obtuse, the exterior acute. Palecp acute, the interior shortest, usually 2- 

 cleft. 



11- April— May. Middle Car. & Ga. Common- 1-2 ft. 



Genus XVIIl. AVENA. 



Glumes 2, 2-7-flo\vered, lonjjer than the florets. Palece 

 bilaciniate, or with the upper bifid toothed, with a twisted 

 awn on the back. Seed furrowed. Panicle loose compound. 



1 A Spicata. Stem erect, pubescent, near the summit. Leaves subulate, 

 small, pubescent. Sheath with the throat bearded, villous. Flowers panicled. 

 Spikes racemose, on short pedicels. Glumes usually 6-flo\\ ered, longer than 

 the spike, margins membranous. Palete 2, exieri ir one lanceolate, villous, 

 the sides terminating in two awns, with the spiral one on the back, between 

 them, interior one ciliate. 



% April— May. Upper districts of Car. & Ga. 1-2 ft. 



2 A Penxsylvanica. Resembles the preceding with the exception that 

 the glumes are 2-flowered, and seeds villous. 



Genus XIX ARUNDO. 



Glumes 2, naked, unequal, about 5-flowered. Palece 2, un- 

 equal, surrounded by bristles at the base, lower one rnucronate, 

 or slightly awned. Style I. 



1 A Phragmites. Stem erect, jointed, branching to^^ ards the summit. — 

 Leaves lanceolate, flat, pubescent on the under surface. Panicle large, loose, 



1 



