GRAM IN E^I. 391 



HAS. Wet grounds. Can. to Car. Aug. U. Culm 2 5 feet 

 high. Leaves a foot or more in length. Panicle terminal, 8 10 

 inches long, with the flowers green. 



6. MUHLENBERGIA. Schreb. 



Glume 2-valved ; valves very minute, fringed. Palca much 

 longer than the glume, ovate, obliquely truncate, gibbous ; 

 the lower one terminating in a slender bristle. Panicle near- 

 ly simple. Triandria. Digynia. 



1. M. diffusa Schreb. : culm diffuse (decumbent) ; leaves linear-lan- 

 ceolate ; panicle branched, appressed ; awns as long as the paleae. 



HAB. Fields. N. Y. to Car. July. 11- Culm 18 inches long, 

 compressed, geniculate-branched. Leaves scabrous. Panicles 

 lateral and terminal, very slender ; bristle purple. 



2. M. erecta Schreb. : culm erect, simple, and with the leaves pubes. 

 cent ; panicle loose ; paleae 2, with a very long &wn.Brachydytrum 

 aristatum Beauv. Torr. 



HAB. Rocky hills. Can. to Car. July. 1, Root creeping. 

 Culm 2 3 feet high, erect, slender. Leaves pubescent. Panicle 

 contracted. Lower palea with a. very long bristle. 



7. ALOPECURUS. Linn. 



Glume 2-valved, 1-flowered ; valves somewhat equal, con- 

 nate, distinct. Palea united into a bladder-like glume, cleft 

 on one side below the middle, generally bearded. Styles often 

 connate. Panicle spiked, cylindric. ' Triandria. Digynia. 



1. A. pratensis Linn. : culm erect, smooth ; panicle subspiked, cy- 

 lindric, obtuse, thick ; glumes ciliate, connate below the middle, as 

 long as the pale, 



PlAB. Fields and pastures. N. S. May Aug. l^.Culm 

 simple, 2 4 feet high. Leaves flat, smooth. Spike 11-2 inches 

 long. Introduced. Fox-tail Grass. 



2. A. geniculatus Linn. : culm ascending, geniculate ; panicle spik- 

 ed, cylindrical, obtuse ; glumes connate at base, obtuse, hairy on the 

 back and margin ; paleae truncate ; styles free. 



b. aristulatus Torr. : awn scarcely exserted. A. aristulatus Mich. 



A. subai~istatus Pursh. 

 HAB. Wet meadows. Can. and N. S. N. to Arc. Amer. ; rare. 



June. H'Culm 1218 inches high, knee-jointed and rooting 



below, terete, smooth. Leaves linear-lanceolate, very acute. 



Spike nearly 2 inches long. Var. a. has the awn as long again 



as the paleae. 



8. PHLEUM. Linn. 



Glume 2-valved, much longer than the paleae ; valves equal, 

 boat-shaped, rostrate or mucroaate. Palea 2, included in 



