ORAMINEiE. 277 



«' P AuTUMNAi.is. Stem erect, glabrous. Leaves slightly scabrous, flat. 

 i\ifiic/M diri'iiso. S/nAffcf* gen trolly S-flowered. G/u/nc* unequal ; exterior 

 palea obtuse, 5 nerved. 



4 August.— Sept. Middle Car. and Ga. 12-18 in. 



8 P ViRiDls. Stem erect, oblique at the base, striate, glabrous. Leaves 

 glabrous^ linear, flat. Panicle difl'use, wi-.h 3 or 1 branches :u each joint. 

 &/u/nr-« acute, margins scurious, white. Spikelels 3-5 flowered, woolly at 

 the base. 



% May— June. Common. 2-3 ft. 



9 P Anql'stifolia. Slem glabrous, erect. Leaves linear, "labroup, invo- 

 lute, uppt-r ones broadest. Panicle crowded. Spikelels usually 1-llowered, 

 villous at the base. Palecr tinged with purple, villous at the base. 



%. .May — June. Common. 1-2 tt. 



10 P Tenei-la. Stem decumbent, glabrous. Leaver subulate, scabrous 

 on the upper surface. Sheath hairy at the throat. Panicle expanding, with 

 veriicillate brandies; exterior palea purple, 3-5-nerved. 



Tiirough tlie Summer. Cultivated grounds, common. 6-12 in. 



11 P Pectixacea. 6Ve//i erect, or oblique ■i^'=are« erect, hai.~y at the base. 

 SJteaths hairy at the throat. Panicle capillary, expanding, pyramidal, hairy 

 in the axi's. i^pikelels 5-10-flowered ; interior palea persistent. 



July — Aug. Sandy helds. 8-12 in. 



12 P EiUGROSTis. Stem geniculate and branching at tl.c !)ase, glabrous. 

 Leaves short, linear, glabrous, nerved. Panicle sprciuling, lower branches 

 hairy in the axils. Spikehts 9-15.flowered ; florets obtuse ; exterior palea 

 acute. 5-nerved, transparent. 



July— August. Sandy fields. 12-18 in. 



13 P NiTiDA. Stem erect, glabrous. Leaves linear; throat of the sheath 

 slightly ha:ry. Panicle difl'use, capillary. iSpikeltts 7-9-fl^wered. Glumes 

 compressed; ex eri-ir palea 3nerved, transparent. 



O Through the Summer. Cultivated lands. 12-18 in. 

 H P Refracta- ^>^;/l erect, terete, glabrous. Z^'U-c*- slightly hairj-. Pan' 

 tele ditfuse, large. SpiktUls 15-20-flowered ; exterior jialea 3-nerved. 

 % August-Scpt. Damp soils. 2 ft. 



15 P Fluitaxs. Stem erect, glabrous. Leaves scabrous on the upper 

 surface. S/ieii'A*- glabrous, with large stipules. Panicle branching. Spike- 

 lets sessili>, 9-10 ffjwered. Glumes membranous, smaller than thcpaleaB; 

 exterior palea 7-nerved, obtuse. 



% .May— Aug. Upper districts. 1-2 ft. 



16 P Reptans. i^/outr^ dioecious. 5/eOT decumbent, creeping, branched. 

 Leaves subulate, striate, slightly pubescent. Sheath liairy at the throat. 

 Panicle fascicled. Spikelets 12-20flowered ; exterior palea with the midrib 

 green. 



CD Thror.gh the Summer. Moist cultivated lands. 6-18 in. 



17 P RiiiiDA. ^''<7n as<urgen», glabrous, rigid. Lea te;j subulate, glabrous. 

 Pa«it/<.' secund. Spikclels linear-lanceolate, 3-5-7-flowered. G/umes keeled. 

 Pale^e rouneded, tinged with purple. 



% April — May. Dry soils. 2-4 in. 



18 P Qui.sQCEFiDA. Stem erect, glabrous. Leaves distichous at the base, 

 sligluly serrulate. Sheath hairy at the throat. Panicle expanding. Spikclcts 

 5-flowered ; exterior palea 3-5-nerved, which extend beyond the margin, 

 hairy at the base. 



1\. Sept. — Oct. Sandy soils, common. 4 ft. 



19 P Ambigua. Stem erect, glabrous. Leaves linear, glabrous. SheatJis 

 bearded at the throat. Panicle expanding. Sjnkclets dark purple, sessile. 



% Sept. 2 ft- 



GEiars XXV UNIOLA. 

 Glumes numerous, shorter than the florets. Florets 3-20, 



PAKT It. 2*2 



