MONOCOTYLEDONOUS PLANTS. 



HAB. Swamps. N. Y. to Car. July, Aug. O.-CWm G-8 

 inches long, rooting at the joints. Panicle 12 inches lonjr 

 with the spikelets compressed. 



24. K eragrostis Linn. : panicle equal, spreading, the lower branch 

 s hairy in the axils ; spikelets linear-lanceolate, 9 15-flowered ; flo- 

 rets obtuse ; root fibrous. P. oblusa Nutt. Briza eragrostis MuhL 

 H to Sandy fields, &c. N. Y. to Car. July, Aug. .-rw*. 

 o inches long, geniculate and branching at base. Panicle 

 pyramidal ; branches short, flexuous. 



40. GLYCERIA. Brown. 



Spikelets slender. Glume 5 7-flo\vered ; valves 2, trun- 

 ,cate, with transparent membranous edges, shorter than the 

 florets. Lower palea eroded or many-toothed, embracing the 

 upper, which is bifid-toothed. Scales connate. Seed furrow- 

 ed. Panicle nearly simple. Triandria. Digynia. 



.1. G.Jluitans Brown : panicle secund, slightly branched ; spikelets 

 linear-terete, appressed, 8 12-flowered ; florets very obtuse, 7-nerved ; 

 leaves long, flat. Festuca ftuitans Linn. 



HAB. Wet grounds. N. S. W. to Mich. June, July. If. 

 Root creeping. Culm 3 5 feet high, compressed or ancipitous. 

 Panicle nearly a foot long. 



2. 6. acvtiflora Ton. : panicle simple, elongated, appressed ; spike- 

 lets linear- terete, 4 fl-flowered ; florets attenuated, acute, indistinct- 

 ly nerved ; leaves short, erect. Festuca brertfolia Muhl. 



HAB. Overflowed meadows. N. S. June. 2J..Culm 18 inches 

 high. Panicle long and slender, nodding. Dr. Gray has found 

 it in Ontario county, N. Y. 



41. UNIOLA. Linn. 



Spikelets compressed. Florets imbricated in 2 rows, the 

 lower only abortive. Glume 3 20-flowered, shorter than the 

 florets. Lower palea boat-shaped at the end, abruptly cut 

 off and mucronate between the lobes ; the upper subulate, 

 somewhat bifid-toothed. Scales emarginate. Seed with 2 

 horns. Panicle compound, loose. Triandria. Digynia. 



1. U. lattfolia Mich. : leaves broad and flat ; panicle loose, nodding : 

 spikelets on long peduncles ; florets somewhat falcate, monandrous ; 

 the lowest one abortive. 



HAB. Mountains. Penn. to Geor. Aug. "U.Culm 2 3 feet 

 high, somewhat branching. Panicle a foot long, loose. 



2. U. gracilis Mich. : panicle elongated, racemose, appressed ; spike- 

 lets S-flowered ; florets spreading ; straight, monandrous ; the lowest 

 one abortive. Holcus laxns Linn. 



HAB. Sandy swamps. N. Y. to Car. Aug. 2J..CuIm 4 



