GRAMINE^E. 405 



31. ARUNDO. Linn. 



Glume naked, beardless, 2-valved, unequal. Paha mem- 

 branous, surrounded with bristles at the base ; lower one mu- 

 cronate or slightly avvned. Seed enclosed in the paleae. 



Triandria. Dig y ma. 



A. phragmites Willd. : glumes about 5-flowered, a little shorter than 

 the florets. Phragmites communis Trin. Torr. 



HAB. Near ponds. N, Y. to Geor. Aug. U.Culm 612 feet 

 high, with numerous joints. Panicle very large, loose, some- 

 what nodding. At a distance resembles Indian corn. 



Reed Grass. 



32. DANTHONIA. De Cand. 



Glumes 2 5 flowered, longer than the florets, cuspidate. 

 Palea bearded at the base ; lower one 2-toothed, with a twist- 

 ed awn between the teeth ; upper one obtuse, entire. Panicle 

 spiked. Triandria. Digynia. 



D. spicata P. de B. : panicle simple, appressed ; spikelets 7^9, about 

 7-flowered ; lower palea hairy ; leaves subulate ; lower sheaths hairy 

 at the throat. Avena spicata Linn. 



HAB. Woods and fields. Can. to Car. W. to Mich. June 

 Aug. U. Culms cespitose at base, 12 feet high. PanicU 

 spiked. 



33^ FESTUCA. Linn. 



Glume 2-valved, many-flowered ; valves unequal. Palece 

 2, lanceolate ; outer one acuminate or awned at the extremity. 

 Panicle generally compound. Triandria. Digynia. 



1. F. myurus Linn. : panicle slender, crowded, equal ; spikelets 

 about 4-flowered ; florets subulate, awned, hairy, monandrous. 



HAB. Dry fields. N. J. to Car. June. 0. Culm 6 8 inches 

 high, geniculate at base. Awn twice as long as the palea. 



9. F. tenella Willd. : panicle spiked, very simple, secund j spikelets 

 mostly 9-flowered ; bristles shorter than the subulate florets ; culm fili- 

 form, angular above ; leaves setaceous. 8. bromoides Mich. 



HAB. Sandy fields. N. Y. to Car. June. ' 0. Culms nu- 

 merous, 8 12 inches high. Panicle racemose or spiked. 



3. F. duriuscula Linn. : panicle secund, oblong, contracted ; spike- 

 lets 5 6-flowered, nearly terete ; florets terminated by short bristles ; 

 root fibrous. .. *. cj 



HAB, Fields and pastures. N. Y. to Car. June. l[.Culm 

 1218 inches high. Pantile with geminate branches. Intro- 

 duced. 



4. F. rubra Linn. : panicle secund, erect, spreading ; spikelets some- 



