616 SRAMINEJE. (GRASS FAMILY.) 



base of 'the flrm-membranaceous lower palet, which bears near its base a twisted aim 

 of its own length. — Dry woods, Pulpit Rocks and vicinity, Huntingdon Co., 

 Pennsylvania, Prof. T. C Porter. 



7. C. Pickeringii, Gray. Culm l°-l^°high; leaves short ; panicle py- 

 ramidal, purplish; glumes ovate-oblong, bluntish or bluntly pointed (L^"-2" 

 long); hairs both >. of the flower and of the rudiment very short and scanty, one fourth 

 or tiith the length of the flower, none behind the obtuse lower palet, which 

 bears between its middle and base a short and stout (straight or bent, not twisted) 

 awn. — White Mountains, New Hampshire, in the alpine region of Alt. Wash- 

 ington (Dr. Pickering, &c.) ; and a more luxuriant form with smaller spikelets 

 at Echo Lake, Franeonia, W. Booit. Sept. 



§2. CALAMO VILFA. Glumes and equal palels rather chartaceous, compressed- 

 keeled ; the lower (fume shorter than the upper and shorter than the jialets, of which 

 the lower is \-nerved and entirely awnless : the upper strongly 2-keeltd : rudiment 

 of second flower wanting : panicle open and loose. 



8. C. brevipilis, Gray. Branches of the diffuse pyramidal panicle capil- 

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

 one half shorter than the palels, which are above twice the length of the hairs and 

 bristly-bearded along the keels. (Arundo brevipilis, Torr.) — Sandy swamps, pine- 

 barrens of New Jersey : rare. Sept. — Culm 3° - 4° high : leaves nearly flat. 



9. C longifdlia, 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 up- 

 per as long as the similar palets, the lower one fourth shorter; the copious hairs 

 more than half the length of the naked palets. — Sands, along the upper Great Lakes, 

 from Illinois and Michigan northwestward. Aug. — Spikelets 2%" long- 

 Sheaths clothed with deciduous wool. 



§3. AMMOPHILA, Host. Rudiment of second flower present and plumose above : 

 glumes nearly equal and rather longer than the equal similar palels, scarious-char- 

 aceous, lanceolate, compressed-heeled: lower palet 5-nerved, slightly mucronate or 

 obscurely a wind near the tip ; the upper 2-keeled : squamulm lanceolate, much longer 

 than the ovary : panicle spiked-contracted : spikelets large (|-' long). 



10. C. arenaria, Roth. (Sea Sand-Kekd.) Culm stout and rigid 

 (2° - 3° high) from firm running rootstocks ; leaves long, soon involute ; panicle 

 contracted into a dense cylindrical spike (5' -9' long) ; hairs only one third of 

 the length of the palet. (Arundo, L. Psamma, Beauv.) — Sandy beaches, 

 New Jersey to Maine, and northward, and on the Great Lakes. Aug. (EuJ 



14. ORYZOPSIS, Michx. Mountain Rice. (PI. 8.) 



Spikelets 1 -flowered, nearly terete. Glumes herbaceous or thin-membrana- 

 ceous, several-nerved, nearly equal, commonly rather longer than the oblong 

 flower, which is deciduous at maturity, and with a very short obtuse callus or 

 scar-like base Lower palet coriaceous, 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. Squamulas 2 or 3, conspicuous. 

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



