234 GRAMINEAE. Vol. I. 



2. Tridens stricta (Nutt.) Nash. Narrow Three-toothed Grass. Fig. 562. 



Windsoria stricta Nutt. Trans. Am. Phil. Soc. (II.) 5: 



147. 1833-37. 

 Tricuspis stricta A. Gray, Proc. Phila. Acad. 1862 : 335. 



1863. 

 Sieglingia stricta Kuntze, Rev. Gen. PI. 789. 1891. 

 Tridens stricta Nash, in Small, Fl. SE. U. S. 143. 1903. 



Culms ii°-4° tall, erect. Sheaths shorter than the 

 internodes; ligule a ring of short hairs; blades 6'-i° 

 long or more, flat, long-acuminate, smooth beneath, 

 scabrous above; spike-like panicle S'-I2' in length, 

 the branches appressed, the lower 1-2' long; spike- 

 lets 4-10-flowered, 2"-3" long, the joints of the 

 rachilla very short; lower scales usually about two- 

 thirds as long as the spikelet, rarely extending be- 

 yond the flowering scales, acute, glabrous; flowering 

 scales ovate, the nerves pilose for more than half 

 their length, the middle and often the lateral excur- 

 rent as short points. 



Moist soil, Missouri and Kansas to Mississippi and Texas. July-Oct. 



3. Tridens elongata (Buckley) Nash. Long-panicled Three-toothed Grass. 



Fig. 563. 



Uralepis elongata Buckley, Proc. Phila. Acad. Sci. 



1862: 89. 1863. 

 Sieglingia elongata Nash, in Britt. & Br. 111. Fl. 3 : 



504. 1898. 

 Tricuspis elongata Nash, Britt. Man. 127. ' 1901. 

 Tridens elongata Nash, in Small, PI. SE. U. S. 143. 



1903. 



Culms i°-3° tall, tufted, erect, rough. Sheaths 

 rough, longer than the internodes, a ring of hairs 

 at the apex, the lower sheaths usually sparingly 

 papillose-pilose ; blades rough, usually involute 

 when dry, 3'-io' long, i"-2" wide; panicle nar- 

 row, s'-io' long, ¥ wide, its branches erect, i¥ 

 or less long; spikelets 10-12-flowered, 4.V-6" 

 long, the empty scales scabrous, hispidulous on 

 the midnerve, the first i-nerved, the second 

 3-nerved ; flowering scales about 3" long, obtuse 

 at the scabrous apex, 3-nerved, the lateral nerves 

 vanishing at or below the apex, the midnerve 

 usually excurrent in a short point, all the nerves 

 pilose below the middle. 



Prairies, Missouri to Colorado, Arizona and Texas. 



June-Aug. 



74. ERIONEURON Nash, in Small, Fl. SE. U. S. 143. 1903. 



Perennial tufted grasses, with thick linear leaf-blades having thickened white margins, 

 and dense, contracted almost capitate panicles. Spikelets several-many-flowered; empty 

 basal scales 2, narrow, acuminate; flowering scales broad, 3-nerved, pubescent on the nerves 

 below, and sometimes also on the body of the scale at the base, with long silky white hairs, 

 the apex acuminate, entire or slightly 2-toothed, the awn terminal or arising between the 

 minute teeth. Stamens 3. Styles short, distinct. [Greek, in reference to the hairy nerves 

 of the flowering scale.] 



A monotypic genus of the southwestern United States and Mexico. 

 pilosa Buckley. 



Type species : Uralepis 



