MANUAL OF THE GRASSES OF THE UNITED STATES 



215 



lets, and pedicels viscid; spikelets oblong, mostly 6- to 8-flowered, 5 to 

 8 mm long; glumes subacute, mucronate; lemmas 4 mm long, obtuse, 

 pubescent on the callus and lower 

 half of keel and margins, the 3 

 nerves excurrent; palea a little 

 shorter than the lemma, some- 

 what bowed put below. 21 (Tri- 

 cuspis seslerioides Torr. ; Tridens 

 seslerioides Nash; Tridens flavus 

 Hitchc.) Old fields and open 

 woods, New Hampshire to Ne- 



FIGURE 416. Distribution of 

 Triodia flava. 



braska, south to Florida and 

 Texas (fig. 416). The type speci- 

 men is the rare form with yellow- 

 ish panicle. In some Florida 

 specimens the excurrent nerves of 

 the lemma are as much as 1 mm 

 long. 



10. Triodia texana S.Wats. (Fig. 



417.) Culms FIGURE 417. Triodia texana. Panicle, X 1; floret, X 



erect, densely 5 " (Wooton ' Tex ' } 



tufted, 20 to 40 cm tall; sheaths pubescent at throat 



and collar ; blades flat or subin volute, 1 to 4 mm wide, 



tapering to a slender point; panicle open, 5 to 15 cm 



long, nodding, the branches rather distant, flexuous, 



drooping, few-flowered; spikelets oblong, 6- to 10- 



flowered, 6 to 10 mm long, rather turgid, pink or 



purplish, more or less nodding on short pedicels; 



glumes broad, acute to obtuse; lemmas 4 to 5 mm 



long, obtuse, minutely lobed, 



the margins densely pilose 



near the base, the keel gla- 



brous or sparsely pilose be- 



low, the 3 nerves short-ex- 



current; palea about as long 



as the lemma, strongly 



bowed out at base. 21 (Tri- 



dens texana Nash.) Plains 



and dry slopes, central and southern Texas, and 



northern Mexico. 



11- Triodia stricta (Nutt.) Benth. (Fig. 418.) 

 . (Newion, Kansj Culms rather stout, erect, 1 to 1.5 m tall; blades 

 elongate, flat or loosely involute, 3 to 8 mm wide; panicle dense, 

 spikelike, more or less interrupted below, narrowed above, 10 to 



F '<"" 



