854 



POACE.E 



A ''Oiirseporenuial with creeping rootstoeks, blades rigid, narrow 

 and involute. 



Very nearly related to Calaniovilfa Hack. 



1. A. arenaria (L.) Link, Ilort. Herol. 1:105 (1827). Beach- 

 OUASS. Sand-gkass. Antiido arcHdi-ia L. 8p, P]. 83. (irs;]). 



P.^(inim(( in f oralis Bcauv. Agrost. i7(!, /. a, /. 

 i (ISr.'). ('((ha>ui(/ro.s/is aroiaria lloth. Fl. 

 Germ. l-.U (KSS). 



Culms stout, (iO-OO em. higli. Leaves 

 erect. Panicle dense, cylindrical, 13-25 cm. 

 long, 1-2 cm. broad. Si)ikelets compressed, 

 10-12 mm. long. Lmpty glumes com- 

 pressed, liju'ar or lanceolate, scabrous on 

 the keel, first 1-nerved, second 3-nerved; 

 floral glume scabrous, compressed, lanceolate, 

 emarginate, often slightly mucronate; i)alea 

 4-nerved, hairs and rudiment less than half 

 as long as the spikelet. 



Atlantic coast and along the Great Lakes; 

 seacoast of the British Isles. 



Owing to the abumlant hard rootstocks, sometimes 40 feet long, 

 it is excellent for i)reventi.ig the drifting of sands along the shore.' 



70. (14Ia). Calamovilfa Hack. True (rrasses, 1];{ (1890). 



Spikelets 1-flowered. in panicles more or less diffuse, rachilla 

 articulate above the outer glumes, bearing a tuft o<" hairs arouiul the 

 floral glume, not produced beyond it. The empty glumes i)er- 

 sistciit. unequal, chartaceous, thick, compressed-keeled; floral glume 

 and palea of like texture, the former 1-nerved, awnless, thelatter 

 2-keeled, 2-toothed. 



^'ery nearly allied to AmmophUa and Calamagrostis. 



There are thi'ee species, all Korth American. 



a. Spikelets 3.5-4.5 mm. lon^. . i 



o X 



D. Spikele.3 4-5 mm. long o 



c. Si)ikelets 5-f5 mm. long '.".'.''■' 



1. C. brevipilis (Torr.) Hack. 1. c. Arundo hre'vipilu Tovv 

 Flor. U. S. 1: 95 (1824). Calamagrostis brevipilis A. Gray; Man. 



Fir,. ^)9.—A7)ivio]t7u'la 

 oi'i tiiirid. A, s])ike 

 l<'t; 11, Horct. (Scrib- 

 iicr.) 



