410 



ORDER 155. GRAMINE^C. 



culm terete, slender, 2 4f, with very narrow Involute-setaceous leaves. Dry '>ap> 

 rens, Fla. to La. July. + (R. campestris N.) 



2 It. rtigosa (N.) Pedicellate spkl. neutral; e gl. lanceolate, transversely rugous ,' 



ppikes 2 3', terminal and axillary ; culm compressed, 2 4f. Swamps, S. Sept. + 



3 R. corrugata Baldw. (a) Pedicellate spkl. (d) staminate ; e gl. (c) ovate, deeply 



reticulately pitted ; spikes 36', colored ; culm coinprenscJ, 2 4f. Low lands. S. 



71. STENOTAPHRUM, Trin. Spike flat- 

 Icned. Spkl. 2-flwcl., in pairs at each joint, em- 

 bedded, one pedicelled and sterile, the other ses- 

 sile and constructed like Panicum (p. 391). it 

 Culm branched. 



S. dimidiitum (Thunb.) (a) Smooth, leafy, decum-, 



bent, 2 3f ; leaves (6) lance-linear, flat ; spikes single, lateral and termh.al, 3' by 8", 

 joint? not separating. Low lands, S. June. + 



72. ERIANTHUS, Rich. PLUME G. Spkl. 

 all fertile, 2-flwd., in pairs at each joint of the slen- 

 der rachis, one sessile, the other pedicelled, both 

 involucrate at base with a tuft of hairs. Gl. sub- 

 equal, exceeding the fls. Lower fl. neutral, of 1 

 hyaline pale, upper of 2, 1-awned. If Stout, erect 

 grasses, with flat leaves and tawny silky panicles. 



Hairs of the in vol. much longer than the spkL.Nos. 1,2 

 Hairs of the involucre short or none Nos. 3, 4; 



1 E. alopecuroides Ell. Culm ((5 lOf!) and broad 1 vs. 



silky-hirsute ; panicle dense, oblong. l - 2 23' ; hair* of 



the invol. twice longer than the (2|") spkl., thrice shorter than the straight awn which 



is terminal on its pale. Wet pine-barrens, N. J., W. and S. (a, b) 



2 E. coiitirtus Ell. Culm (.4 6f), and broad-linear leave* gl tbrous ; panicle oblong, 



6- -10 ; hairs of the invol. thrice longer than the (3") spkl., twice shorter than the 

 contortid awn issuing from the base of the 2-c.left pale. Wet grounds, S. 



3 E. brevibarbis MX. Culm and leaves as in the last; panicle dense. S 14'; hairs 



thortrr than the (4") spkl. ; awn some twisted, 8 10" ; pale bind. Low grounds. S. (c) 



4 E. strict:!* Bald. Culm (4 7f ) and long, narrow (3 o") leave? glabrous ; panicle 



strict^ spike-form, 1020', reddish brown ; awn straight ; invol. almost 0. Banks, S. 



73. SACCHARUM, L. SUGAR-CANE. Spkl. all fertile, awnless, in 

 pairs, one sessile, the other pedicellate, 2-flwd., lower fl. neuter, of a singl ; ; 

 pale, upper 11.' 5 of 2 pales. Gl. 2, subequal. Pales 2, hyaline. Sta. 1 3. 

 U Gigantic tropical grasses with branching panicles. Spikelets cinctured 

 at base with long silky hairs. 



S. CFFICINAUUM. Cnlm solid, short-jointed, erect, 8 20f; Ivs. many, broad and flat; 

 pan. 1 2f, of numerous racemes, richly clothed with the long, white, silky, involu- 

 crate hairs. Native of S. Asia. Cultivated far South. 



74. ANDROPOGON, L. BEARD G. Spkl. in pairs at, each joint of 

 a slender rachis (a), one on a plnmous-bearded pedicel (d) imperfect, the 

 other (e) sessile, 2-flwd. Lower flower of 1 empty pale, upper flower 5 

 of 2 hyaline pales, the lower lipped with an awn. Sta. 1 3. 2{ Culms 

 erect, branched, coarse. Flowers spiked. 



