Ordbb 156.— GRAMINE^. 783 



13 P. Digitaria Poir. Mostly glabrous ; culm erect from an inclined base, 1 to 

 2-Jf high; Ivs. lance-linear, flat, 6 to 16' by 5 to 8", on long sheaths; spikes a 

 pair, aonjugate, slender, 2, to 4' long, at top of the long naked ped. or upper inter- 

 node of culm ; spikelets lanceolate, in 2 opposite rows on tlie vertically compressed 

 flexuous raohis. — (J? Damp pine woods, Va. to Fla. and La. (Millium paspa- 

 loides BU. P. Michauxiana Kth.) 



14 P. tristdohytiin Le Conte. Glabrous, decumbent below, 12 to 20' high; 

 culm filiform above ; Ivs. linear, flat, 3 to 8' by 2 to 3", margins sparingly ciliate ; 

 sheaths compressed; spikes usually 3, approximate (the 2 highest paired), very 

 slender; raohis flexuous, triquetrous; spikelets lanceolate, 2-rowed, whitish, 

 1" long, close-pressed, gl. and pale scarcely longer than the flowers. — ®"Wet 

 places, Ga. Fla. to La. 



15 P. coningatuin Berg. Nearly glabrous and erect, 1 to 2f, slender; Ivs. 

 broadly linear, 2 to 4' by 2 to 4", on compressed sheaths ; upper sheath very long 

 and nearly leafless ; spikes 2, a conjugate pair, on the filiform upper internode, 

 very slender, 2 to 3' long ; raohis nearly as wide as the 2 rows of minute (J" long), 

 round-ovate, acute, white, ciliate spikelets. — Q Waste places about N. Orleans 

 (Hale). 



16 P. distichum L. Nearly glabrous ; culms some inclining at base, 12 to 18' 

 high; Ivs. lance-linear, bearded at the tliroat, 2 to 3' by 2 to 3'' ; spikes 2, a pair 

 nearly or quite conjugate, dense-flowered, 1 to 2|-' long ; raohis narrower tlian the 

 2 rows of ovate, acuminate (1 J" tore?), glabrous spikelets. — y Wet grounds, S. States. 



/3. tristaohitm:. Spikes in 3s, closely approximate. 



17 P. ambiguuin DC. Glabrous; culms clustered, decumlent, S to 15'' high; Ivs. 

 lance-linear, shorter than the sheaths (2 to 4' by 2 to 4"); spikes 2 to 4, about 

 2' long, slender; spikelets crowded, 2-rowed, ovate, f" long, gl. and pale about 

 equal, not longer than th? purplish flower, both hairy. — Sandy fields, especially 

 South. Often purplish. Aug., Sept. § Eur. (Panioum glabrum Gaud.) 



18 P. serotiaum Pluegge. Decumbent, creeping and rooting, with upright 

 branches ; Ivs. and sheatlis villous with white soft hairs, the former lance-linear, sliort, 

 about V by 2"; spikes digitate, about in 5s, slender, 2 to 3' long; rachis flat, 

 about as wide as the 2 rows of elliptical spikelets (^") ; spikelets all pedicellate, 

 in 2s; gl. a fourth as long as the striate pale, aoAflower. — (J) Sandy fields. Car. to 

 Pla. and La. Perms a dense carpet. Jl. — Oct. (Digitaria villosum Ell.) 



19 P. sanguinale Lam. Pukple Pingeb Grass. Ceab Grass. Gulms de- 

 cumbent at base, radiating and branching at the lower joints, 1 — 2f; Ivs. linear- 

 lanceolate, on long, loose sheaths, softly pilous, the sheaths strigously hairy ; spikes 



3 5' long, fascinate at the top of the stem, 5 to 9 iogetlier ; spikelets in pairs, 



oblong-lanceolate, closely appressed to the flexuous raohis, in 2 rows, glume i as 

 Img as the flower. — ® Common in cultivated grounds, N. Eng., W. Ind. Aug.— 

 Oct. (Panicum, L. Digitaria, Scop.) 



20 P. filifonne Swartz. Culm erect, filiform, simple, 12 — 18' ; Ivs. short, nearly 

 smooth, narrow-lanceolate; lower sheaths very hairy, upper glabrous; spikes 

 2 4, filiform, erect; rachis flexuous; spikelets in 3s, all pedicellate; glume soli- 

 tary, as long as the pale (abortive fiower).— (1) Dry, gravelly soils, N. T. to Ky. 

 Aug. (Panicum, L. Digitaria, Muhl.) 



21 P. intemiptum. Culm strictly erect, wiry, tall (2 to 3f); Ivs. long, linear, 8 

 to 15' by 3 to 4", clothed with copious soft hairs, as well as the sheaths; spikes 

 3 or 4, raceme-like, 2 to 6' long, the spikelets ovate, acutish, in remote pairs dis- 

 tinctly pedicellate, rachis filiform.— Dry soils. La. and Tex. (Hale). (P. racemosum 

 Nutt. nee Jacq.) The inflorescence is almost paniculate. 



16. MIL'LlUffljL. Millet Grass. (Probably from the Latin mille, 

 a thousand, on account of its fertility.) Spikelets 1-flowered, not articu- 

 lated with their pedicels; glumes 2, without involucre or awns; pales 

 2, shorter than the glumes, awnless, oblong, concave, persistent and car- 

 tilaginous, coating the caryopsis. (Comparing Millium with Panicum, 

 it appears that the 2 glumes of the former are, in fact, a glume, and a 



