548 GRAMINEJE. (GRASS FAMILY.) 



$ 2. CALAMOVfLFA. — Glumes and equal palea rather chart ac.eous, compressed- 

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

 the lower is l-nerved and entirely aimless ; the upper strongly 2-keeled: rudiment 

 wanting : panicle open and loose. 



5. C 1>revipiliS. Branches of the diffuse pyramidal panicle capillary 

 (purplish) ; glumes ovate, mucronate ; 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. lou^ifdlia, 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 lanceolate, the 

 upper as long as the similar paleze, the lower ^ shorter ; the copious hairs more 

 than half the length of the naked palece. — Sands, Illinois, Michigan, and north- 

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



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

 similar paleie, 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 : squamuloz lanceolate, much longer than the 

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



7. C. arenaria, Both. (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- 

 lese. (Arundo, L. Psamma, Beauv.) — Sandy beaches, New Jersey to Maine, 

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



13. OKYZOPSIS, Michx. Mountain Rice. 



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

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

 is deciduouf 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 amens 3. Squamulaj 2 or 3, conspicuous. Styles sometimes united : 

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

 Spikelcs 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. nielaiaocisrpa, Muhl. Leaves lanceolate, taper-pointed, flat; 

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

 divergent; spikelets loosely raccmed ; awn thrice the length of the blackish palea 

 (nearly 1' long). (Milium raccmosum, 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. asperifwlia, Michx. Culms (9' -18' high) clothed with shoaths 

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



