GKAMINEiE, (OEASS FAMILY.) 867 



36. AIKIlflOPIIILA, Host. AxiMormLA. 

 Spikelcts 1-flowered, laterally flattened, with one, perfect, short- 

 stalked floweret, and the rudiment of a second. Glumes membranous, 

 coriaceous, nearly equal, the lower 1-nerved, the upper o-nerved. Pales 

 coriaceous, nearly equal, the lower bearded at base, compressed-keeled, 

 5-nerved, 2-toothed, with a short mucro at sinus, upper 2-keeled. 

 Styles short, stigmas feathery — Perennials, with stout stems, and 

 long, spike-like panicles. 



A. areiiaria, L. 2f 1 or more, growing in clumps from a creep- 

 ing, woody root-stock. Leaves long, involute, sharp-pointed. Panicle 

 .25 to .3 long, .015 to .03 thick; glumes and pales about .01 long; 

 mucro of lower pale as long as teeth — April — Sands; Haifa. 



'17. I.AGUI1US, L. IIare's-Tail Grass. ^^^^' 2*^^- 



Bpikelets laterally flattened, with one 

 fertile floweret, and the rudiment of a sec- 

 ond. Glumes subulate-tapering, feathery, 



longer than floweret. Lower pale bifid- ^ , , 



aristate, with a dorsal, bent awn, inserted <^\: ' \(/*^'5^< 

 below sinus; upper pale narrower, 2-keeled '-^ "■ ' '.^'''"-v^- 



— Annuals, with dense, ovate, woolly heads. ^^>^ ' ^ / -^y^- 



m 



lu. OTatiis, L. .1 Jto .4, erect or ^ 



r^- 



ascending. Leaves villous. Heads .015 to -kC' '^''^^^ '%■''-' ^'^ 



. 04 lo ng, . 1 5 to . 02 th ick ; central awm nearly r^- -\ >'^* t'^'(^' >i-^' 



twice as long as lateral ones, and all the ^-^^ ,^"\V/';.. r^ 



awns long-exserted — Spring — Sandy and — ^^'^^^^J^ 



dry places especially near coast. ' -^v^-^" .-.-^v 



3§. AIRA, L. Hair Grass. HeadofLagumsovatus. 



S pikelets with 2, perfect flowerets, and often with the rudiment of 

 a third. Glumes nearly equal, usually longer 

 than pales. Lower pale rounded at back, 

 usually bifid or with two bristles at tip, and a 

 twisted or bent but not club-shaped awn in- 

 serted on the back, or muticous. Upper pale 

 2-keeled, 2-toothed. Stigmas 2, sessile, plu- 

 mose — Annuals, with spikelets paniclcd on 

 capillary pedicels. 



A, capillaris, Host. .2 to. 5; culms 

 slender. Leaves setaceous. Panicle triclio- 

 tomous, diffuse, .05 to .08 long; pedicels 

 several times as long as spikelets, scabrous; 

 flumes oblong, scabrous, eroded at tip, mucro- 

 tiate; lower floweret usually muticous; lower 

 pale of upper floweret with a bent awn at mid- 

 dle of back, twice as long as glumes — April Tipol panideof AiracapillariK. 



^0 .June — Dry, sandy places. 



39. CORYINEPIIORrS, P. de B. Cluh Grass. 



Spikelets with 2 fertile flowerets, the lower sessile, the upper 

 stipitate. Glumes scarious, boat-shaped, keeled, nearly equal, longer 

 than flowerets. Pales scarious, nearly equal ; the lower aristate from its 

 base, the awn jointed at its middle, the lower joint twisted, blackish, 



