VIl] FLORAL CHARACTERS 115 



The difficulty is most likely to occur with varieties of F. ovina 

 and F. elatior : in the former the leaves are narrower, setaceous and 

 stiflfer than in any Poa. The ribbing of the leaf, the ligule, and 

 other characters of the vegetative organs (see pp. 45 and 50) will 

 help in these doubtful cases. 



t Awns terminal, or sub-terminal ; often very short 

 or nearly obsolete and the palees merely drawn 

 out at the tips to a hard sharp awn-point. 



© Awns long and sub-terminal, inserted 



between the teeth of the cleft apex of the 



palew. Sheaths entire. Panicle usually 



nodding. 



Bromus. 



With the exception of Festuca Myurua and one or two other rare 

 Fescues with setaceous leaves, Hordeum and Brachypodium are 

 the only other genera with awns much resembling the Bromes. 

 The former has a totally different inflorescence, and in the latter the 

 spikelets are practically sessile (see p. 107). 



= Spikelets short and fat, and relatively heavy. 

 Palece broad and distinctly nerved. Awns 

 fine, about as long as the palece. 



B. arvensis, L. 



There are several varieties, of which B. seoalinus with a looser 

 panicle, and B. mollis with a more compact panicle and very 

 downy, are the chief. 



= = Spikelets lanceolate and with conspicuous 

 awns. Nerves on the palece obsolete. 



X Panicle conspiewmsly loose and drooping 

 and atons long, palece narroio and elon- 

 gated. 



z Sheaths vnth long often reflexed hairs. 

 A shade-grass over three feet high. 



B. asper, Mull. 

 8—2 



