548 GKAMINK^E. (GRASS FAMILY.) 



$ 2. CALAMOVlLFA. Glumes and equal palece rather ch.artac.eous, compressed- 

 keeled ; the lower glume shorter than the upper and shorter than the palete, of which 

 the lower is l-nerved and entirely awnless ; the upper stronyly 2-kceled : rudiment 

 wanting : panicle open and loose. 



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

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

 shorter than thepaleai, which arc above twice the length of the hairs and brisl/y-beard- 

 ed along the keels. (Arundo brevipilis, 7brr.) Sandy swamps, pine barrens of 

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



6. C. Ioilif6lia, Hook. Culm (l-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 Immolate, the 

 upper as long as the similar paleai, tlve lower shorter ; the copious hairs more 

 than half the length of the naked pal ece. Sands, Illinois, Michigan, and north- 

 westward. Spikelcts g' long. Sheaths clothed with deciduous wool. 



3. AMM6PHILA, 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: spikelets large (' long). 



1. fD. arenaria, Roth. (SEA SAND-REED.) 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 \ the length of the pa- 



leae. (Arundo, L. Psamma, Beauv.) Sandy beaches, New Jersey to Maiuo, 



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



13. ORYZOPSIS, Michx. MOUNTAIN RICE. 



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

 eral-nerved, r .early equal, commonly rather longer than the oblong flower, which 

 is deciduour at maturity, and with a very short obtuse callus. Lower palea cori- 

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

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

 apex. S;amens3. Squamulae 2 or 3, conspicuous, tylcs sometimes united : 

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

 Spikele^ greenish, rather large. (Name composed of opva, rice, and cty-is, 

 likeness, from a fancied resemblance to that grain.) 



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



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

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

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

 (nearly 1' long). (Milium racemosum, Smith. Piptatherum nigrum, Torr.) 

 Rocky woods ; not rare. Aug. Culm 2 - 3 high. 



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



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

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



