ACJUOSTIDK.E. 301 



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

 occupied by Kunth, Enum, PI. 1:212 (1833), hence tlie selection of 

 a new one. 



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

 Agricul. 



\\2. S. argutus (Nees) Kuuth, Enum. PI. 1:215 (1S33). Vilfa 

 ar(jHfa Neos, Agrost. Bras. 3:395(1820). V. Avkansan(i'\!v\n. 

 Mem. Acad. St. Petersb. (VI.) 5:04 (18-10). 



Culms spreading or erect, 20—40 cm. high. Slieaths loose, a 

 little shorter than the internodos, tliroat ciliate; ligiile very 

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

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

 2-4 cm. long, those of the culm 3-4 in number, tbe ui)j)er one 3-10 

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

 same plant, 3-5 cm. long; rays in half-wborls of 3-0 or even 8, 

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

 distiint. Spii<elets shining, lead-color; first empty glume 0.4-0.5 

 mm. long, second and floral glume elli])tical-hnu'eolate, 1-nerved, 

 1.5 mm. long; palea bi'oader, a little sborter, sjditting in the back 

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

 long. 



Florida, Palmer 294; Texas, Xealley for Nat. Herb., RevcrcJioii; 

 Lower California, Palmer 188; Mexico (Chihuahua), Pringle 810, 



Texas to Arizoiui and Mexico. 



Very variable; number 224, of I)r. Palmer from Lower Cali- 

 fornia has thicker rougher leaves and broader spikes. 



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



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

 rootstocks. Slieaths 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-tbirds. Spikelets pur[)lisli, linear, about 1.5 

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



