648 GRAMINE^. (grass FAMILY.) 



i 2. CALAMO VILFA. — Glumes and equal paleoe rather chartaceous, compressed^ 

 heeled; the hwer glume shoHer than the upper and shorter than the palece, of which 

 the lower is l-nerved. and entirely awnless ; the uppei- strongli/ 2-keeled: rudiment 

 wanting : panicle open and loose. 



5. C brevlpilis. Branches of the diffuse pyramidal panicle capillary 

 (purplish) ; glumes ovate, mucronate ; the upper slightly, the lower nearly one half, 

 shorter than th&pakce, which are above twice the length of the hairs and bristly-beard- 

 ed along the keels. (Arundo brevipilis, Torr.) — Sandy swamps, pine barrens of 

 New Jersey ; rare. Sept. — Culm slender, 3° - 4° high : leaves nearly flat. 



6. C. Ioni;1f6lia, Hook. Culm (lo-4° high) stout, from thick running 

 rootstocks ; leaves rigid, elongated, involute above and tapering into a long thread- 

 like point ; branches of the pyramidal panicle smooth ; glumes lanceolate, the 

 upper as long as the similar palese, the lower J shorter ; the copious hairs more 

 than half the length of the naked palece. — Sandy coast of N. Michigan, and north- 

 westward. Spikelets |' long. Sheaths clothed with deciduous wool. 



§ 3. AMMOPHILA, Host. — Glumes nearly equal and rather longer than the equal 

 similar palece, scarious-chartaceous, lanceolate, compressed-keeled: lower palea 5- 

 nerved, slightly mucronate or obscurely awned near the tip; the upper 2-keeled; 

 rudiment present and plumose above : squamulce lanceolate, much longer than the 

 ovary: panicle spiked-contracted : spikdets large (^' long). 



7. C. arenaria, Both. (Sea Sand-Eeed.) Culm rigid (2° - 3° high) 

 from stout running rootstocks ; leaves long, soon involute ; panicle contracted 

 into a dense cylindrical spike (5' -9' long) ; hairs only J the length of the pa- 

 le£e. (Arundo, L. Psamma, Beauv.) — Sandy beaches, New Jersey to Maine, 

 and northward ; also Lakes Michigan and Superior. Aug. (Eu.) 



13. ORYZOPSIS, Michx. Mountain Rioe. 



Spikelets 1 -flowered nearly terete. Glumes herbaceo-membranaceous, sev- 

 eral-nerved, nearly equal, commonly rather longer than the oblong flower, which 

 is deciduous at maturity, and with a veiy short obtuse callus. Lower palea cori- 

 aceous, at length involute so as closely to enclose the upper (of the same length) 

 and the oblong grain ; a simple untwisted and deciduous awn jointed on its 

 apex. Stamens 3. Squamulse 2 or 3, conspicuous. Styles sometimes united : 

 stigmas plumose. — Perennials, with rigid leaves and a narrow raceme or panicle. 

 Spikelets greenish, rather large. (Name composed of opv(a, rice, and o^is, 

 likeness, from a fancied resemblance to that grain.) 



* * Styles distinct, short : culm leafy to the summit : callus glabrous, 



1. O. lUClanocdrpa, Muhl. Leaves lanceolate, taper-pointed, flat; 

 eheaths bearded in the throat ; panicle simple or sparingly branched, the branches 

 divergent ; spikelets loosely racemed ; awn thrice the length of the blackish palem 

 (nearly 1' long). (Milium racemosura, Smttt. Piptatherum nigram, Torr.) — 

 Eocky woods ; not rare. Aug. — Culm 2° - 3° high. 



* * Styles united below, slender : culms tufted, naked above : callus bearded. 



2. O. aspcrifolia, Michx. Culms (9'- 18' high) clothed with sheaths 

 bearing a mere rudimentary blade, overtopped by the long and rigid linear leaf 



