48 TRIAXDRIA DIGYKIA ' 



Qfc This plant is sometimes nearly smooth: but often the leaves auu iheatk 

 ave quite pubescent One of th»- specimens in my copy of Dr. Gray's work has U^ 

 vo-ies smooth. There is, apparently, an autumnal variety of this species, witfc 

 narrow-lanceolate, erect, crowded leaves at summit, and blended with small d-. 

 patiperatcd panicles, giving it something of the habit of P. dichotomutn. 



&. P. clandesti*um, L. Culm with short axillary branches, node* 

 smooth ; leaves broad-lanceolate, suhcordate at base, often dilate 

 sheathe hispid, enclosing the short lateral panicles ; abortive floret neu- 

 tral, the upper palea obtuse, about 2 thirds the length of the lower one. 

 Beck, Bot. p. 394. Smcim. Gray* Cram. 1. no. 27. 

 P. latifolium, var. clandestinum. Pursh. Am* 1. />. 68. Bart. Phil. 



1, /;. 49. 



ClAICDBSTIJTB, 0R HlDDEJT-VLOWBBED PaNICIM. 



Root perennial. Culm 2 to 3 feet high, rigid, leafy, nodes smooth ; branches ar> 

 prerted. Leaves 3 to 6 inches long, ovate-lanceolate, strongly nerved, filiate at 

 base : sheaths deeply striate, hispid with horizontal hairs arising from papilUt in 

 the grooves. Panicles terminal and lateral ; the latter concealed in the sheaths of 

 the leaves, simple, few-flowered. Spikelets oblong-ovoid, rather obtuse, pubescent: 

 lower glume ovate, acute, the upper one oval, 7-nervcd. Perfect jl ore t al out a* 

 long as the upper glume, smooth and shining. 



Hub. Moist grounds, meadows and thickets : frequent; Ft. July. Fr. Sept. 



Obs. Resembles P. laHfulium ; but may be distinguished by the characters hejM 

 given. I have specimens, with smooth nodes, which seem to be intermediate be- 

 tween P. clandc8tinum&rn\ Y. latifolium ; and which I was inclined to think might, 

 be P. nervosum, Mithl. But they do not quite agree with the description. 



# # Spikelets in racemose Panicles. 



9. P. 4GROSTOIDB9, MuhL Culm compressed, glabrous ; leaves very 

 long ; panicles terminal and lateral, pyramidal ; branches bearing ra- 

 cemes ; spikelets appressed, small, lanceolate, acute ; abortive floret neu- 

 tral, with the pale® nearly equal. Beck, Bot. p. 396. Specim. Grau, 

 Gram. 1. no. 32. 



P. elongatum. Pursh, Jim. I. p. 69. 



P. fusco-rubens ? Mitt. Gen. 1. p. 53. Also? Eat. Man. p. 249. 



AOROSTIS-LIKE PaWICUM. 



Root perennial. Culm 2 to 3 feet high, smooth at the joints. Leaves forming a 

 large tuft about the root; those of the culm about a foot long, lance-linear, keeled, 

 scabrous on the margin; sheaths shorter than the internodes, striate, glabrous; 

 ttgule very short, truncate. Panicles mostly dark purple, terminal and lateral ; 

 the latter on long compressed peduncles ; branches slightly flexuose, at longth hori- 

 zontal. Spikelets in somewhat secund racemes, crowded, on short pedicels, acute,, 

 amooth, often with very slender setaceous bracts at base : lower glume about half 

 lae longth of the upper, very acute, keeled ; upper glume rather longer than the 

 abortive floret, acuminate, with 5 prominent nerves. Upper palea of the abortive 

 floret acute, 1 -nerved. Perfect floret nearly a third shorter than the upper gimme, 

 smooth and shining. 

 Mab. Moist meadows : borders of swamps : frequent. Fl. July. Fr. Sept. 



10. P. akcefs, Mx. Culm compressed ; 6heaths ancipital, pilose near 

 the throat, and on the margin ; panicle erect, oblong, somewhat contrac- 

 ted, with nearly simple branches ; spikelets interruptedly racemose) 



