92 NOTES. 



corolla valvulis aequalibus, valvula exteriore apice 5-dentata> 

 interiore bifido. 



Root perennial creeping. Culm 3 feet high and more. 

 Leaves naked, a little rough backwards on the upper surface ; 

 somewhat glaucous beneath. Ligule elongated, ovate. Sheaths 

 smooth, striated. Panicle large, and of a few spikes ; rachis 

 and branches distinctly flexuous. Branches in pairs, forked, 

 Spikes lanceolate, compressed* all of them on pedicels, and 

 terminal. Calyx 2-valved, unequal, the larger valve ovate, 

 obtuse, and obsoletely 3-nerved, the other rather acute, and 

 both of them scarious on the margin. Corolla : valves nearly 

 equal ; the exterior ovate lanceolate, with 5 very distinct, 

 prominent, rough nerves ; the other valve lanceolate, white 

 with a green margin, rather scabrous, bifid at the apex, even 

 when very young. Stamina, filaments 3, as long as the corol- 

 la ; anthers pale yellow. Pistillum, germen oval, compressed : 

 stigmas 2, plumose* white. 



This species, though hardly agreeing with the generic char- 

 acter as laid down by Nuttall, appears to be a congener with 

 W. ambigua. (Poa ambigua of Elliot.) It is not described 

 under the genus Poa, in Muhlenberg's grasses, nor in any 

 other American work, though the species is not scarce. It 

 grows in swamps of the pine barrens of New-Jersey, as well 

 as in the place mentioned in the catalogue. 

 Page 44. Cerastium nutans, Raf. This is probably the Ceras- 



tium glutinosum of Nuttall. Gen. Amer. PI. 1. p. 291. 

 Page 48. Geum agrimonoides, Pursh. There may he some doubt 

 whether our plant is identical with that of Pursh. The fol- 

 lowing are its characters, taken from living specimens. 



G. pubescens, viscosum : foliis pinnatis ; foliolis sessilibus 

 subrotundis duplicato-inciso-serratis obliquis, imparibus sub- 

 ovatis : stipulis adnatis acutis integris : floribus congestis sub- 

 sessilibus ; calycis foliolis oblongis acutis ; petalis obovatis ca- 

 lyce longioribus. 



Leaves growing in a tuft about the root, those on the stem 

 few. Stem about two feet high, flowers white: The whole 

 plant is covered with a viscid exudation, which entangles 

 small insects. 

 Page 60. Lathyrus siipulaceus, Le Cojite : L. caule alato tctra- 

 gono : stipulis magnis semisagittatis ovatis acuminatis : foliis 

 3-jugis ellipticis mucronatis: pedunculis 4-6-floris foliis sub- 

 longioribus. 



Flowers large, purple. 

 Page 64. Enpatorium laevigatum, nobis : E. calyceplusquam 5- 

 floro : foliis quinis pctiolatis lanceolatis utrinque glaberrim- 

 is tenuibus : caule fistuloso laevi subglauco. 



Stems from 5 to 6 feet high, marked with purple lines. 



Flowers purple. 



From E. maculatum, it differs in having a hollow stein, and* 

 from E, purpureum, in having smooth leaves. 



