Order 156.— GRAMINE^. 807 



cave, coriaceous, inner thin or liyaline, like the (smaller) pales ; sta- 

 mens 3. — Grass erect, tall. 



1 R. camp^stris Nutt. ? Glabrous ; culm simple, slender (2 to 4f ), with black- 

 ish, somewhat geniculate joints ; Ivs. very narrow, involute-setaceous ; spike soli- 

 tary, terminal, little thicker than the culm, 2 or 3' long ; ped. spikelet obsolete ; 5 

 gl. ovate, acute, faintly impressed-dotted. — La. (Hale.) 



2 R. rug6sa. Glabrous ; culms rather stout, 3 to 5f, erect, Iramched ; Ivs. flat, 

 linear ; spikes solitary, several, terminal and axillary, 2 to 3', leas thick than the 

 base of the culm ; ped. fl. of. 2 empty glwmes ; 5 outer gl. ovate, acute strongly 

 reiioulately rugous. — Prairies, La. (Hale.) (Apogonia, Nutt.) 



66. STENOTAPHRUffl, Trin. Spike compressed; spikelets 2-flow- 

 ered, in pairs at each joint, imbedded, 1 sessile and 1 pedicellate (or in 

 4s to 6s) ; glumes membranous, the outer minute, inner large ; flowers 

 each of 2 coriaceous pales, similar, but the lower $ ; styles 2, slender ; 

 stamens 3 ; grain free. — 71 Culms decumbent, branched joints of spikes 

 not separable. 



S. dimididtutn. Glabrous, very leafy; culm 2 to 4f; Ivs. flat, broadly linear, on 

 broad, open sheaths ; spikes lateral and terminal, solitary, much compressed, 3' 

 by 2 to 3", the raohis flat on the back, spikelets in 2 lateral rows in front, the ses- 

 sile embraced by the pedicel of the other. — Low grounds, coastward, S. States. 

 Jn. — Sept. (RottbosUia, Thumb. S. Amerioanum Sohrank.) 



67. ERIANTHUS, Rich. Plume Grass. Beaed Grass. (Gr. 

 lpt,ov, wool, avdog.) Spikelets 2-flowered, all fertile, in pairs at each 

 joint of the slender rachis, one sessile, the other pedicellate ; glumes 

 membranous, subequal, longer than the flowers ; pales hyaline, the 

 lower flower of 1 neutral, the upper of 2, perfect, with the lower pale 

 awned ; spikelets involucrate at base, with a tuft of bristly hairs. — 2f 

 Stout, erect grasses, remarkable fof their large woolly or silky, tawny 

 panicles. 



* Hairs of the involuci'O much longer than the fipikelet Nos. 1, 2 



* Hairs of the involucre shorter than the spikolet, or nearly none Nos. 8,4 



1 B. alopecuroides Ell. Culm 5 to 8 or 10:^ erect, stout, silky bearded, espe- 

 cially at the joints ; Ivs. broadly linear ; flat, silky pubescent, 2 to 3f by 1 to 2' ; 

 pan. dense, oyliudrio-oblong, very large (12' to 20' long); hairs of the invol. twice 

 longer than the Bhort (2 to 2-J-") spikelete, a third as long as the straightish awn 

 which is terminal on its pale. — Swampy pools in pine barrens, Ta. to Fla. and La. 

 The plume-like panicles are magnificent 1 



2 E. oont6rtus EII. Culm 4 to 6^ erect, glabrous; Ivs. broadly linear, flat, 

 smooth, except a tuft of silky hairs at base ; pan. contracted, oblong, 6 to 10' ; 

 hairs of the invol. long, silky, thrice longer than the spikelei (which is 3"), f the 

 length of the spiraUy contorted awn which issues from near the base of its deeply 

 diful pale. — ^Wet grounds, about Charleston, S. C. to N. Orleans. Pan. of a hghter 

 hue than the last. 



3 E. brevibdrbis Mx. Culm stout, 3 to '!(, erect, glabrous ; Ivs. broad-linear, 

 smooth, except at the base ; pan. large (1 to 2f), contracted, lance-oblong, the 

 rac. more distinct from the fewer hairs ; hairs of the invoL hardly as long as the 

 larger (4'') spikelei, \ the length of the awn which is some twisted and its pale 

 bifid. — -Low grounds, S. States. Sept, Oct 



4 E. strfotus Baldw. Culm 4 to Tf, strictly erect and glabrous ; Ivs. very long, 

 narrower (3 to 5'') than in the other species, rough-edged ; pan. very strict, 1 to 

 2f long, branches erect, appressed ; invol. of hairs minute; awn straight, terminal 

 on its deciduous pale. — Ga. to La The whole panicle is reddish brown. Augl, 

 Sept. 



68. SACCHARUM, L. Sugar Cane. (Gr. adaxap, Arabic, sovJcar, 

 Eng. sugar.) Spikelets all fertile, in pairs, one sessile, the other pedi- 



