DESCRIPTIONS OF TRIBES AND GENERA. 



145 



yy. Stigmas three, inserted at the apex of the 

 ovary (terminal) ; empty glumes extending 

 into long awns. . . . 270. Megalachne. 



Sub-tribe A. — Pappophoreae. 

 Flowering glumes with three to many awns or lobes. 



196. (197) Pappophorum (Fig. 72). Panicles spike- 

 like. Spikelets 1-3-flowered. At maturity the flower- 

 ing glumes with their numerous 

 awns resemble the fruit of a Com- 

 posite with pappus. 



Species about twenty, especially 

 in the tropics of both hemispheres, 

 one extending as far as Northern 

 Asia, North America, and Austra- 

 lia. 



Sec. I. Polyraphis Lindl. (as a 

 genus). Flowering glumes with 

 13-23 naked awns. 



Sec. II. Enneapogon Desv. (as a 

 genus). Flowering glumes with 

 nine, usually plumose, awns. 



197. (198) Cottea Kunth. Pani- 

 cles loose ; spikelets. 2-6-flowered, 

 broad, short-awned, laterally com- 

 pressed. 



Species one (C. pappophoroides 

 Kunth), in tropical America as far 

 north as Arizona and New Mexico. 



198. (200) Schmidtia Steud. (An- 

 toschmidtia Steud.). Panicles narrow, loose ; spikelets 

 resembling those of a small Avena ; empty glumes long. 



Species two, from tropical South Africa to Egypt. 



199. (208) Calamochloa Fournier. Inflorescence an 

 ovate panicle composed of short spikes. Spikelets 3-4 

 in each spike, two-flowered. Flowering glumes hairy on 

 the callus. 



Species one (C. Jilifolia), in Mexico. 



200. (62) Cathestechum Presl. Spikelets in groups of 

 threes, these in loose rows on a common axis and decidu- 



FlG 



Pappophorum palli- 

 dum Brown. (After Kunth, 

 Rev. Gram. pi. 51.) 



