188 



THE TRUE GRASSES. 



Species about sixteen, in Europe, temperate Asia, 

 North Africa, and North and South America. 



Sub-genus I. Zeocriton Beauv. (as a genus) ( Criterion 

 Rafin.). Rachis (cultivated forms excepted) articulate, 

 each joint falling off with the group of spikelets attached 

 above it. The middle spikelet fertile, the lateral ones 



FIG. 104. Two FIG. 105. Hordeum sativum hexnsti- FIG. 106. Common 4- 



ranked barley. chon. B 3. Group of three spikelets. rowed barley. Hor- 



Hordeum sati- B, a spikelet from behind; B\, from deum sativum vul- 



vum distichon. in front. Kl, Fruit from in front; pore. 



#2, from behind. (After Nees, Gen. 



Germ., I. 83.) 



mostly short-pedicellate, rarely sessile, sterile (fertile 

 only in cultivated forms) ; terminal spikelet aborted ; 

 fruiting glumes persistent on the pedicels. 



Species twelve, among which are H. murinum L., with 

 pedicellate lateral spikelets, a widespread weed; H. 

 sativum Jesseu, Cultivated Barley, with sessile lateral 



