548 GRAMINE^E. (GRASS FAMILY.; 



$ 2. CALAMOVlLFA. Glumes and equal palace rattier chartaceous, compresscl- 

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

 the lower is \-ncrcei1 and entirely awnless ; the upper strongly 2-keeled : 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, 

 hotter than the palew, which arc 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 ; leaves rigid, elongated, involute above and tapering into a long thread- 

 iik'e point ; branches of the pyramidal panicle smooth ; glumes lanceolate, the 

 upper as long as the similar palcse, the lower | shorter ; the copious hairs more 

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

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



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

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

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

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

 ovary : panicle spiked-contracted: spikekts large (^ long}. 



7. C. areiiaria, 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 J the length of the pa- 

 leae. (Arundo, L. Psamma, Deanv.} Sandy beaches, New Jersey to Maine, 

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



13. ORYZOPSIS, Michx. MOUNTAIN RICE. 



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

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

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

 BCCOUS, 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. Squamulae 2 or 3, conspicuous. Styles sometimes united: 

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

 Spikele.s greenish, rather large. (Name composed of opva, rice, and fyis, 

 likeness, from a fancied resemblance to that grain.) 



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



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

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

 divergent; spikelets loosely raeemed ; awn thrice the length of the blackisJi paleve 

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

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



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



L>. O. :csjM'i iJolia, Michx. Culms (9'- 18' high) clothed with shoatlis 

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



