450 POACE.E. 



98. (198). COTTEA Kimth, Eev. Gram. 1: 84, 281, t. 52 (1830). 

 Sj^ikelets 2-9-flowered in a spreadiug oblong panicle, racliilla ar- 

 ticulate below the flowers; flowers perfect or the upper ones male 

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

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

 lobed, the lobes tapering into awns; palea broad, membranous, ellip- 

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

 plumose. Grain ovate or oblong, slightly compressed on the back, 

 enclosed by glume and palea, but not adherent. 



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

 to Mexico, Texas, and Arizona. 



Nearly allied to Papi)02:)liorum^ from which it differs in the 

 looser panicle, and in the florets, which 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 thinly clothed more or less with short pubescence. 

 Culms 40-60 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. 



New Mexico, Wright 2057; Arizona, Jones, Lemmon 3061; 

 Lower California, Palmer 239; Mexico, Prmgle 4:20, Palmer 1G2, 

 339. 



Texas to Arizona and Mexico. 



99. (62). Cathestecum Presl, Rcl. Ha?nk. 1 : 294, t. 42 (1830). 

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



rachis. Spikelets unisexual, those of the fertile spikes 5 mm. long, 

 villous. On fertile spikes, lateral spikelets 1-flowered, neutral with 

 a second rudiment in the terminal spikelet, the lower flower pistil- 

 late, the second neutral, a third rudimentary. Lower empty glumes 

 minute, broad, irregularly toothed, or obliquely truncate, the upper 

 3 mm. long, ovate-lanceolate, 1 -nerved, villous, mucronate; floral 

 glume of lateral spikelets 3 mm. long, elliptical, 4-lobed for a third 



