GRAMINEiE, (aHASS FAMILY.) 86t 



36. AMMOPmLA, Host. Ammophila. 



Spikelets 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 3-nerved. Pales 

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

 5-nerved, 2-toothed, with a short mucro at sinus, upper 3-keeled. 

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

 long, spike-like panicles. 



A. arenaria, 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 .02 thick; glumes and pales about .01 long; 

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



37. L.AGURIJS, L. Hare's-Tail Grass. 



Spikelets 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 

 below sinus ; upper pale narrower, 2-keeled 

 — Annuals, with dense, ovate, woolly heads. 



li. ovatu§, L. .1 to .4, erect or 

 ascending. Leaves villous. Heads .015 to 

 .04 long, .015 to. 02 thick; central awn nearly 

 twice as long as lateral ones, and all the 

 awns long-exserted — Spring — Sandy and 

 dry places especially near coast. 



3§. AIRA, L. Hair Grass. 



Fia. 389. 



Head of Lagurus ovatus. 



Spikelets 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-keeied, 2-toothed. Stigmas 2, sessile, plu- 

 mose — Annuals, with spikelets panicled on 

 capillary pedicels. 



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

 slender. Leaves setaceous. Panicle tricho- 

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

 several times as long as spikelets, scabrous ; 

 glumes oblong, scabrous, eroded at tip, mucro- 

 nate; lower floweret usually muticous; lower 

 pale of upper floweret with a bent awn at mid- 

 dle of back, twice as long as glumes — April Tip of panicle of Airacapillaris. 

 to June — Dry, sandy places. 



39. CORYNEPHORUS, P. de B. Club 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, 



