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) (Critesion 

 Rafin.). Bachis (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 

 ranked barley. 

 Hordeum sati- 

 vum distichon. 



Fig. 105. — Hordeum sativum hexasti- 

 chon. B'i. Group of three spikelets. 

 B, a spikelet from behind; B\, from 

 in front. Kl, Fruit from in front; 

 K% from behind. (After Nees, Gen. 

 Germ., I. 83.) 



Fig. 106.— Common 4- 

 rowed barley. Hor- 

 deum sativum vul- 

 gare. 



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 Jessen, Cultivated Barle} T , with sessile lateral 



