410 



ORDER 155. GRAMINEJE. 



culm terete, slender, 2 4f, with very narrow involute-setaceous leaves. Dry bar* 

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



2 R. rugosa (N.) Pedicellate spkl. neutral ; gl. lanceolate, transversely rugous; 



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



3 II. corrugata Baldw. (a) Pedicellate spkl. (d) staminate ; 9 gl. (c) ovate, deeply 



reticulately pitted ; epikes 3 6', colored ; culm compressed, 2 4f. Low lands. S. 



71. STSNOTAPHRUM, Trin. Spike flat- 

 tened. Spkl. 2-flwd., in pairs at each joint, em- 

 bedded, one pedicelled and sterile, the other ses- 

 sile and constructed like Panicuni (p. 891). 

 Culm branched. 



S. dimidiltum (Thnnb.) (a) Smooth, leafy, decum-, 



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

 joints 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, exceediug the fls. Lower fl. neutral, of 1 

 hyaline pale, upper of 2, 1-awned. 11 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 (GlOf!) and broad 1 vs. 



silky-hirsute; panicle dense, oblong. 1-2 20'; Iriirs of 



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



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



2 E. contortus Ell. Culm (.1 6f ), and broad-linear leaves glabrous ; panicle oblong, 



610' ; hairs of the invol. thrice longer than the (3") spkl., twice shorter than the 

 contorted awn issuing from the base of the 2-cU-ft pale. Wet grounds, S. 



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



shorter than the (4'0 spkl. ; awn some twisted, 810" ; pale bind. Low grounds. S. (c) 



4 E. strictus Bald. Culm (4 7f ) and long, narrow (35") 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 single 

 pale, upper fl. 5 of 2 pales. Gl. 2, subequal. Pules 2, hyaline. Sta. 13. 

 11 Gigantic tropical grasses with branching panicles. Spikelets cinctured 

 at base with long silky hairs. 



S. OFFICINARUM. Culm solid, short-jointed, erect, 8 20f; IVP. many, broad and flat; 

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

 cratc 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 plumous-bearded pedicel (d) imperfect, the 

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

 of 2 hyaline pales, the lower tipped with an awn. Sta. 1 3. 11 Culms 

 erect, branched, coarse. Flowers spiked. 



