516 



POAC'E.E. 



a. Empty glumes sj)oiigy 3 



B. Spikelets ;3— t mm. long 3 



C. Spikelots 7-S mm. long 4 



D. Spikelets 12-16 mm. long 5 



1. U. latifolia Mi(;hx. Fl. IJor. Am. 1:71 (l.S()3). 

 Culms rather stout, G0-12() cm. high. Leaves numerous, 



sheaths mostly slu)rter thau thi; internodes: 

 ligulo a fringe of very sliort hairs; blades lanceo- 

 late, about ll-ril)l)e(l, 10-18 cm. long, 1.5-2.5 cm. 

 wide. Panicle loose, nodding, 18-30 em. long. 

 Spikelets i)edi(!ellatc, droo[»ing, ol)long, acute, 2-3 

 cm. long, lo-15-flowered, empty glumes subefjual, 

 linear-lanceohite, 5-9 mm. long; lloral glume 10- 

 13 mm. long, ovate-lanceolate, the keel winged 

 and ciliate; ]>alea falcate, shorter than its glume. 

 Stamen 1. 



Fw. mi. — Uniola Dchiware. ('(in/>i/; Illinois, Mead; 'J'exas, 

 latifolid. Spikc- 

 lei. (Scribiitr.) Jf<'li'i*X\, J)nniuno/i(i ; New Mexico, Fcndlcr U\4. 



Kiver-banks, southern Pennsylvania to Illinois, Florida, and 



New Mexico. 



2. XJ. paniculata L. Sp. PI. 71 (1753). Ska-oats. 



Culms stout, hard, 1-3 m. high. Ligule a fringe of hairs; 

 blades very long, rigid, soon involute or convolute. J'auicle open, 

 droojjing, 3()-G0 cm. long. Spikelets on short pedicels, whitish or 

 straw-colonul, 2-2.4 cm. long, oblong, about 12-flowered; eini)ty 

 glumes glabrous, 6-8 mm. long, spongy, 3-nerved; lloral glunu' 10- 

 12 mm. long, 7-nerved, keel not winged nor ciliate; palea sciarcely 

 falcate, serrulate on the keels. Stanu'us 3. 



North Carolina, ID/ams ; Florida, (larbvr ; Texas, \\'ri(//iL 

 Sand-hills along the seacoast, Virginia, to Florida, aiul Mexico 

 to Ecuador. 



3. U. laxa (L.) ii. S. P. Prel. Cat. N. Y. 69 (1888). Jfolni.,^ 

 I(i.n(s L. Si). PI. 1048 (1753). U. gracilis Michx. Fl. Hor. Am. 

 1:71 (1S03). 



Culms slciuler, (10-120 cm. high. Sheaths smooth or downy; 

 ligule a ciliati' ring; blades 20-;J0 cm. long, ;5-5 nin;. wide, Hat or 



