BROMUS.] GR AMINES. 501 



SECTION 2. Zeobro'mus, Griseb. Annual or perennial. Lower empty 

 glume 5- upper 7-9-nerved. Fl. glumes close, convex, 5-7-nerved, 2-fid, 

 awned in the sinus. Palea with pectinate-ciliate nerves. Styles inserted 

 below the top of the ovary. Serrafal'cus, Parl. (gen.). 



* Fl. glume longer than its palea. 



6. B. mol'lis, L. ; pubescent or tomentose, panicle ovoid strict, lower 

 empty glume broadly ovate, fl. glumes 6-10 densely imbricate pubescent 

 opaque equalling the slender awn. 



Roadsides and waste places, N. to Shetland ; ascends to 1,800 ft. in N. Eng- 

 land ; Ireland; Channel Islands; fl. May-July. Glaucous green. Stems 

 4-24 in., terete. Leaves flat, |-4j in. broad, soft, edges scabrid ; sheaths 

 terete, villous ; ligule short. Panicle 1-3 in., erect or nodding ; branches 

 very short, subsimple. Spikelets ^- in., compressed, oblong, tips conic ; 

 empty glumes broadly ovate, acute, strongly nerved, upper much largest ; 

 fl. glumes caducous, broadest and obtusely angled above the middle, 2-fid, 

 pubescent. DISTRIB. Europe, N. Africa, W. Siberia; introd. in N. 

 America. Very variable ; Syme enumerates three forms, the typical with 

 pubescent spikelets, and erect nearly straight awns ; a smaller glabrescent 

 one (glabres 1 cens) ; and Lloydia'nus (mollifor'mis, Lloyd) with awns spread- 

 ing outwards in fruit. B. hordea'ceus, Fr., is a prostrate maritime form. 



7. B. racemo'sus, L. ; leaves and sheaths glabrate or hairy, panicle 

 narrow, lower empty glume lanceolate, fl. glumes 6-10 imbricate scabrid 

 shining equalling the slender awn. 



Fields and waste places, N. to Shetland ; ascends to 1,200 ft. in the High- 

 lands ; Ireland ; Channel Islands ; fl. June-July. Very similar to B. mol'lis, 

 but subglabrous, often 2-3-ft., rigid ; leaves rigid, more ciliate; branches of 

 panicle 3-5-nate, long and slender ; spikelets narrower, more acute, scabrid ; 

 empty glumes narrower, especially the lower ; fl. glume broadest above the 

 middle, margin obtusely angled. DISTRIB. Europe (excl. Kussia), N. Africa ; 

 introd. in N. America. 



B. commuta'tus, Schrad. (B. praten'sis, Ehrh., B. arven'sis, Sm.), is stouter, 

 panicle more compound drooping, spikelets shorter, margins of caducous fl. 

 glumes less rounded at the broadest part. 



8. B. secali'nus, L. ; glabrate or sheaths hairy, panicle effuse hairy, 

 fl. glumes 5-8 not imbricate terete scabrid longer than their awns. 



Cornfields, from Isla and Ross southd.; (a colonist, Wats.); fl. June- July. 

 Root of stout fibres. Stems 1-4 ft., strict, rigid, smooth, rarely pubescent 

 (B. veluti'nus, Schrad., and B. multiflo'rus, Sm.) Leaves - in. broad, 

 glabrous or slightly hairy, scabrid above ; sheaths grooved ; ligule short. 

 Panicle 3-5 in., oblong ; branches 3-5-nate and rachis flexuous, scabrid, sub- 

 simple. Spikelets ^-| in., compressed ; empty glumes unequal, broadly 

 oblong, scabrid, mucronate, upper larger ; fl. glumes spreading, linear-oblong, 

 7-9-nerved, margins incurved, straight, hyaline, notched, at length coria- 

 ceous ; awn variable. DISTRIB. Europe, N. Africa, W. Siberia ; introd. in 

 N. America. 



