\ 



564 



CVII. GRAMINEiE. 



[Avena, 



Southampton Bay ; Coast of Durham ; near Hebden Brido-e 

 Yorkshire; Box-Hill. 0. 7, 8. _«This has longer pGckmctes 

 than the 3 preceding species, and the smallest glumellas, the latter 

 resembling those of B, commutatus in acquiring the purple tino-e 

 but diiFering in the prominent ribs or nerves on each side : " Mr, // 

 C Watson (who, however, considers this species not to be really a 

 native of Britain). Dr. Parnell remarks that it is readily distin- 

 guished from B. commutatus by the inner glumella beino* acute and 

 as long as the outer one, which is 7-ribbed, two of the ribs beinn- 

 prominent near each margin. Apex of the larger glume reaciiino^ 

 half-way from its base to the summit of the second ^oref on the same 

 side. Awns rather longer than the glumellas, straight, slightly spread- 

 ing when dry. Anther four times as long as broad. 



•ft Outer glumella d-nerved, 



11. B. '^ pdtulus Kocb (Spreading B.) ; panicle spreadino' 

 loose drooping^ in fruit, lower peduncles much elongated simple 

 or branched, simple peduncles scarcely longer than the linear- 

 lanceolate compressed spikelets, florets imbricated in fruit, Mu- 

 mellas rather shorter than the nearly straight awns with 3 pro- 

 prominent ribs on each side. Parn. Gr. t. 127. Serrafldcus 

 Bab, 



Near Hebden Bridge, Yorkshire ; Mr. Gibson^ 0. 6. — Cer- 

 tainly introduced. Inner glumella shorter than the outer, and only 

 reaching to the base of the awn. Jwns slightly spreading wlien dry. 

 Apex of the larger glume reaching midway from its base to the 

 summit of the second Jloret on the same side. Anthers twice as 

 long as broad. With this we are imperfectly acquainted ; it seems 

 too closely allied to the last, and, according to Mr. Babln-Tton, has 

 the glumella, like it, sometimes only 7-nerved. * 



\2. B. * squarrosus L. {Corn B.) ; panicle droopino-, pedun- 

 cles simple lower ones about as long as the oblong or ovate-Ian- 

 ceolate subcompressed spikelets, florets imbricated in fruit 

 nearly glabrous, glumellas about as long as the at len^rth divari- 

 cating awns with 3 prominent ribs on each side, leaves pubes- 

 cent. E. B. t. 1885 : Pam. Gr.t. 118. Serrafalcus Bab. 



Corn-fields ; Somersetshire, Essex, Kent, and Surrey 6 7 

 — A most distinct species, remarkable for its spreading awns • it is 

 however certainly an introduced plant, and we fear B. secalinus and 

 commutatus are equally doubtful natives. Inner glumella shorter than 

 the outer, and reaching only to the base of the awn. Apex of the 

 larger glume reaching half-way from its base to the su.nmit of the 

 second floret on the same side. Anthers twice as long as broad 



33. AvENA Li 



inn. Oat, or Oat-grass. 



) 



Panicle lax. Spikelets laterally compressed, with 2 or more 

 perfect florets and sometimes 1 or more rudimentary neuter 



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