OROE.I 15G. GRAMINE^E. 80t 



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

 mens 3. Grass erect, tall. 



1 R. campestris Nutt. ? Glabrous ; culm simpk, 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 ; $ 

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



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

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

 base of the culm ; ped. ft. of 2 empty glumes; $ outer gl. ovate, acute strongly 

 reticulately rugous. Prairies, La. (Hale.) (Apogonia, Nutt.) 



66. STENOTAPHRUM, Trin. Spike compressed; spikelets 2-floxv- 

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

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

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

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

 r.ot separable. 



S. dimidiatum. 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 rachis 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. 

 Ju. Sept. (Rottbcellia, Thumb. S. Americanum Schrank.) 



67. ERIAPTTHUS, Rich. PLUME GRASS. BEARD GRASS. (Gr. 

 t-pior, 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. 2 

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

 panicles. 



* llnirs of the involucre much longer than the spikelet Nos. 1. -2 



* Hairs of the involucre shorter than the spikelet, or nearly none Nos. 3, 4 



1 E. alopecuroides Ell. Culm 5 to 8 or lOf, erect, stout, silky bearded, espe- 

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

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

 longer than the short (2 to 2| ') spikelets, a third as long as the straightish awn 

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

 The plume-like panicles are magnificent ! 



2 E. contortus Ell. Culm 4 to Gf, erect, glabrous; Ivs. broadly linear, flat, 

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

 hairs of the in vol. long, silky, thrice longer than the spikelet' ( which is 3"). the 

 length of the spiral' y contorted awn which issues from near the base of its deeply 

 bifid pale. Wet grounds, about Charleston, S. C. to N. Orleans. Pan. of a lighter 

 hue than the last. 



3 E. brevibarbis MX. Culm stout, 3 to If, erect, glabrous 5 Ivs. broad-linear, 

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

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

 larger (4 7 ) spikelet, \ the length of the awn which is some twisted and its palo 

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



4 E. strictus Baldw. Culm 4 to 7f, 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. Aug., 

 Sept. 



68. SACCHARUM, L. SUGAR CASE. (Gr. odKxap, Arabic, swikar. 

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



