548 cn'AMiM.E. (GRASS FAMILY.) 



$ 2. CALAMOVtLFA. Glumr-s and equal palece, rathtr c/iartat'(-ons, compressed- 

 keeled ; the lower <jl a an' shorter tlmn the. iijtjxr and short>r than the ^alxt'., of which 

 the lower is \-nerved and aitir .-/// awnless ; the upper strongly 2-ku-lcd : rudiment 

 wanting : panicle open and loose. 



5. CJ lH'CvipiliS. Brandies of the diffuse pyramidal panicle capillary 

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

 shorter than the palece, 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. loilgifolia, Hook. Culm (l-4 high) stout, from thick running 

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

 like point; branches of the pyramidal panicle smooth ; ylumr* funrfultitc, the 

 upper as long as the similar palcoe, the lower shorter ; the copious haira more 

 than half (he length of the naked palc(e. Sands, Illinois, Michigan, and north- 

 westward. Spikelcts I 1 long. Sheaths clothed with deciduous wool. 



3. AMM6PHILA, Host. Glumes nearly equal and rather longer than the equal 

 similar palece, scarious-chartaccous, lanceolate, compressed-keeled: lower palm 5- 

 nerved, slightly mucronate or obscurely awned near the tip; the tipper 2-kttltd: 

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

 ovary: panicle spiked-contracted : spikelets large, (' long). 



7. C. aren&ria, 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- 

 le. (Arundo, L. Psamma, Beam:.) Sandy beaches, New Jersey to Maine, 

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



13. ORYZOPSIS, Michx. MOUNTAIN RICE. 



Spikclets 1-flowercd nearly terete. Glumes herbacco-membranaccous, sev- 

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

 is deciduous at maturity, and with a very 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. Squamulae 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 3pva, rice, and ttyts, 

 likeness, from a fancied resemblance to that grain.) 



* * Styles distinct, short : culm leafyto the summit : callus glabrous. 



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

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

 divergent; spikclets loosely racemed ; awn thrice the length of the blackish palece 

 (nearly 1' long). (Milium racemosum, Smith. PiptalluTiim nigrum, Terr.) 

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



* * Styles united below, slender: culms tuft id, naked above : callus beardtd. 



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

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



