AGROSTIDE.E. 301 



glume, folded in on the back. Vasey's name of the species was 

 occupied by Kuuth, Enum. PI. 1 :212 (1833), hence the selection of 

 a new one. 



Texas, Nealley ; Mississippi, Tracy, both for U. S. Dept. 

 Agricul. 



32. S. argutus (Nees) Kunth, Enum. PI. 1: 215 (1833). Vilfa 

 arguta Nees, Agrost. Bras. 2:395(1829). V. ArlcansanaTvm. 

 Mem. Acad. St. Petersb. (VI.) 5:64 (1840). 



Culms spreading or erect, 20-40 cm. high. Sheaths loose, a 

 little shorter than the internodes, throat ciliate; ligule very 

 short; leaf -blades of sterile shoots numerous, flat, or the apex invo- 

 lute, 2-4 cm. long, glaucous, scabrous, the margins ciliate-serrulate, 

 2-4 cm. long, those of the culm 3-4 in number, the upper one 3-10 

 mm. long. Panicle usually exserted, spikelike or pyramidal on the 

 same plant, 3-5 cm. long; rays in half- whorls of 3-G or even 8, 

 flower-bearing on the upper two-thirds, the half-whorls 1-2 cm. 

 distant. Spikelets shining, lead-color; first empty glume 0.4-0.5 

 mm. long, second and floral glume elliptical-lanceolate, 1-nerved, 

 1.5 mm. long; palea broader, a little shorter, splitting in the back 

 by the maturing grain, which is compressed and broad, 0.7-1 mm. 

 long. 



Florida, Palmer 294; Texas, Nealley for Nat. Herb., Reverchon; 

 Lower California, Palmer 188; Mexico (Chihuahua), Pringle 816. 



Texas to Arizona and Mexico. 



Very variable; number 224, of Dr. Palmer from Lower Cali- 

 fornia has thicker rougher leaves and broader spikes. 



33. S. Nealleyi Vasey, Coult. Bot. Gaz. 16:48 (1891). 



A slender glaucous perennial, 10-20 cm. high, from strong" 

 rootstocks. Sheaths of the culm about 5 in number, mostly longer 

 than the internodes; ligule a ciliate ring; blades involute, rigid^ 

 pungent-pointed, diverging almost at right angles to the culm, 

 0.5-3.5 cm. long, 0.5 mm. diam. Panicle slightly exserted on a. 

 capillary peduncle, simple, erect, racemose, oval or linear, 3-5 cm^ 

 long; rays 6, the longest about 1.5 cm. long, bearing a few spike- 

 lets on the outer two-thirds. Spikelets purplisli, linear, about 1.5 

 mm. long; empty glumes lanceolate, 1-nerved, first glume iialf as. 



