DESCRIPTIONS OF TRIBES AND GENERA. 109 



Sub-tribe 3.— Euagrosteae. 



Fruiting glume delicate ; stigmas pectinately branched, usually pro- 

 jecting from the sides of the spikelets. 



123. (126) Sporobolus Brown ( Vilfa Beauv. noil Adans., 

 Agrosticula Raddi, Cryptostachys Steud.) (Fig. 51). Pani- 

 cles variable. Spikelets small, awnless, naked ; flower- 

 ing glume and palea usually exceeding the empty glumes. 

 Palea bifid. Fruit a utricle ; the expelled seed usually 

 remains adherent for a time to the spikelet. 



Species eighty, chiefly in temperate and tropical 

 America, but also in the warmer parts of Africa and 

 Asia. One species (S.pungens Kunth) in Europe. Peren- 

 nial, meadow grasses of the American prairies. [S. cryp- 

 tandrus Gray, a valuable forage-grass.] Diachyrium 

 Griseb. and Triachyrium Hochst. are founded upon the 

 erroneous conception of two separate palea?; the divi- 

 sion or splitting of the palea arises mechanically during 

 the ripening of the fruit. 



124. (127) Epicampes Presl. Flowering glume with 

 a delicate, often deciduous, or rudimentary awn on the 

 point ; fruit apparently a true caryopsis. 



Species twelve, from California to the Andes, in the 

 Argentine Republic. Crypsinna and Bauchea Fourn. 

 belong here. 



125. (130) Chaeturus Link. Panicle contracted, short. 

 Spikelets very narrow, in twos or threes upon each 

 branchlet ; flowering glumes somewhat shorter than the 

 empty ones, awnless. Low, annual grasses. 



Species two, Ch. fascicvlatus Link and Ch. prostratus 

 Hack, and Lange, upon the Iberian Peninsula. 



126. (131) Polypogon Desf. (Santia Savi, Raspalia and 

 Nowodivorskya Presl) (Fig. 52). Panicles contracted 

 or spike-like, often interrupted. Empty glumes fre- 

 quently bifid, their awns usually long and slender ; 

 flowering glumes awned. The numerous awns impart a 

 bristly appearance to the inflorescence. 



Species ten, in the warm temperate zones of both 

 hemispheres. Two in the tropics. P. Monspeliensis 



