o7. GKAMINE^. 



163 



Hordeum murinum. 



lanceolate, tapering into an awn 

 3 times its length and much 

 longer than the outer glumes. 



Ail over the State. Oct. -Dec. 

 — Cosmopolitan. 



2. H. ma.ritimum, With. 

 S''(i Vinlej/. Glaucous annual, re- 

 sembling the preceding; sheaths 

 of the lower leaves downy : 

 spikes smaller; middle spikelet 

 fertile and sessile, the lateral 

 one,s smaller, barren, and pedi- 

 cellate, with awns shorter than 

 their out«r glumes ; all the outer 

 glumes bristle-like, not ciliate. 



Adelaide plains near the sea. — 

 Oct. -Dec. — Sea-coasts of western 

 and southern Europe. 



Cultivated Barley, a tall, glab- 

 rous annual, falls readily into 

 two divisions: the first having 

 the spike 'compressed laterally, 

 the central spikelet fertile, ses- 

 sile and long-awned, the 2 lateral spikelets barren, pedi- 

 cellate ancl awnless (H. distichuni, L., Two-rowed Barley); 

 the second having the spikes 4-angled or 6-angled, and 

 the spikelets all fertile and long-awned (R. vvlgarc, L., 

 Four-rowed or Square Barley, and H. hexastichum, L., 

 Six-rowed Barley). All are spontaneous for a period. 



6. Set.\ria, P.B. 



(Latin seta, a bristle; alluding to the bristles surrounding 



the spikelets.) 



Spikelets compressed dorsally, arranged in a spike- 

 like, cylindrical panicle; outer glumes 3, membranous, un- 

 equal, the lowest small, 3-nerved, the 2nd and 3rd 5-nerved, 

 the 3rd containing a palea and rarely a male flower ; flower- 

 ing glume and palea as in Panicum. 



Spikelets whorl ed ; involucre of few bristles .S'. rerticillatu 1 

 Spikelets alternate ; involucre of several 



bristles S. glaiicn 2 



1. Setaria verticillata,, P.B. Erect glabrous 

 annual, with stems rough at the summit; ligule of short 

 hairs; panicle .somewhat ' interrupted and rough upwards 

 from the numerous stiff, denticulate, persistant bristles, 

 the short, thick panicle-branches arranged in false-whorls; 

 spikelets oblong, blunt, each with about 2 bristles at the 

 base of the short pedicel, the bristles cx)vered with little 

 teeth pointing downwards; the lowest outer glume about half 



