450 POACE.E. 



98. (198). COTTEAKuiith, Hev. Gram. 1; 84, 281, /. o^ (1S.30), 

 tSpikolets S-O-tlowored in a spreading oblong panicle, raeliilla ar 

 ticulate below the flowers; flowers i)erfect or the upper ones male 

 or neutral. Empty glumes persistent, membranous, acute or 3- 

 toothed, 7-9-nerved; floral glume 9-13-nerved, irregularly 0-13- 

 lol)ed, the lobes tapering into awns; palea broad, membranous, ellip- 

 tical, ciliate on the keels. Stamens 3. Styles distinct, stigmas 

 })luniose. drain ovate or oblong, slightly com])ressed ou the back, 

 enclosed by glume and i)alea, but not adherent. 



There is only one species known, found from Peru and Brazil 

 to Mexico, Texas, and Arizona. 



Nearly allied to J\ij)j)oj)//orH7)i, from which it differs in the 

 looser panicle, and in the llorets, wiiich are usually more than two. 



1. C. pappophoroides Kunth, 1. c. 



An erect perennial. The whole plant from culm and leaf to the 

 empty glumes thiidy clothed more or less with short pubescence. 

 Culms -±0-60 cm. high. Sheaths loose; ligule a ciliate ring of 

 short hairs; blades 8-10, involute with very slender tips, 10-20 cm. 

 long, 3-6 mm. wide. Panicle 15-18 cm. long, rays solitary, more 

 or less spreading. Spikelets about 8 mm. long, exceeding their 

 pedicels; empty glumes lanceolate, subequal. 4-5 mm. long; floral 

 glume 4 mm. long, pilose along the margins near the base, longest 

 awns about '2 mm. long. 



Tsew Mexico. Wrii/ht 205T; Arizoiui, Jones:, Lcwmon 3001; 

 Lower California, I'dhiier ~39; Mexico, Prinyle 420, Palmer 102, 

 339. 



Texas to Arizoiui and Mexico. 



99. (02). Cathestecum Presl, Kol. llaMik. 1: 294, /. 42 (1830). 

 Spikelets in threes, sessile on alternate sides of a slender-jointed 



rachis. Spikelets unisexual, those of the fertile s])ik('s 5 mm. long, 

 villous. On ferfilc .yiikes, lateral spikelets 1-flowered, neutral with 

 a second rudijuent in the terminal si)ikelot, the lower llower pistil- 

 late, the second neutral, a third rudimentary. Lower emi)ty glumes 

 minute, broad, irregularly toothed, or ()l)lif|uely truncate, theuiii)er 

 3 mm. long, ovate-lanceolate, l-nei-ved, villous, mucronate; lloral 

 glume of lateral spikelets 3 mm. long, elliptical, 4-lobed I'or a third 



