396 MONOCOTYLEDONOUS PLANTS. 



d. pilosum : culm simple, very hairy ; lower leaves approximate 

 and broad-lanceolate ; upper ones linear, rather rigid, somewhat 

 hairy on the upper surface, ciliate at the base ; sheaths villose 

 and minutely papillose ; panicle subcontracted ; branches vir- 

 gate and with the flowers pubescent. 



e. glabntm: smooth on every part, except the base of the leaves, 

 nearly simple ; lower leaves short, approximate, subcartilagin- 

 ous ; panicle branched, almost verticillate ; epikelets large ; 

 upper valve of the abortive floret entire./*, nitidum Schwrintz. 



f. lmrh<ii n in : culm simple, smooth ; nodes hairy, leaves linear- 

 lanceolate ; sheaths smooth, except on the margin ; flowers 

 minutely pubescent. P. discolor MuhL . 



HAB. Meadows, woods and pine barrens. N. S. June, July. 

 L. Culm 18 inches to 2 feet high. Panicle compound. A very 

 variable grass at least if Torrey's account of it be correct. 



14. P. agrostoides Muhl. : culm compressed, smooth, erect ; leave* 

 very long ; panicles lateral and terminal, pyramidal, spreading ; branch- 

 es bearing racemes ; spikelets appressed ; abortive floret neutral ; 

 valves nearly equal. P. elongatnm /'///>//. 



HAB. Wet meadows. N. Y. to Vir. July Sept. If. Cu/wt 

 2 3 feet high, smooth at the joints. J'ttiiii-lt- mostly dark pur- 

 ple. 



15. P. mrgatum Linn. : whole plant very smooth ; panicle diffuse, 

 very large ; flowers acuminate ; valve of the abortive floret nearly 

 equal. 



HAB. Near salt water. N. Y. to Car. July. Aug. If . Cut in 

 3 4 feet high. Panicle virgate, at length spread in jr. 



16. P. a.nccps Mich. : culm compressed ; sheaths ancipitous, pilose ; 

 panicle with nearly simple branches ; spikelets subracemose, much 

 acuminate ; abortive floret neuter, with the upper valve bifid. 



HAB. Wet woods. Penn. to Car. 2/. Culm 3 feet high. 

 Leaves very long. Panicle pyramidal. 



17. P. rectum R. 4* & panicle solitary, shorter than the terminal 

 leaf; branches simple, flexuous ; spikelets alternate, peduncled, obo- 

 vate, turgid ; glumes striate, acute ; leaves linear, straight, tapering 

 to a sharp point, striate and scabrous above, hairy beneath ; sheaths 

 with very long hairs. P. strictum Pursk. 



HAB. Banks of streams. Penn. July. 0. Pursh. 



18. P. verrucosum Muhl : culm slender, decumbent and geniculate, 

 branched below, and with the leaves smooth ; panicle much spreading, 

 few-flowered ; flowers verrucose ; abortive floret 1-valved. 



HAB. Swamps. N. Y. to Geor. Aug., Sept. If Culm a foot 

 high ; nodes smooth and inflated. Leaves lance-linear, spread- 

 ing. Panicles lateral and terminal, spreading. 



19. P. proliferum Lam. : culm assurgent, geniculate at base, very 

 smooth ; panicles terminal and axillary, smooth ; spikelets racemose ; 

 abortive floret 1-valved. P. dichotomijlorum Mich. P. gcniculatum 



Muhl. . 



