There are certainly very strong affinities between the various forms of P. gracilis + P. Pennsylvanicum - both species varying similarly in the stage + manner of the leaflets in the character of pubescence + inflorescence - in such a manner that by joining the pinnatifid leaflets of the one as a to form the leaf of the other the transformation is complete. There is an abundant distinction, showing in the character of the style which in P. Pennsylvanicum, is short with a thick + flushy base, but in P. gracilis, nira, + conciisima long + slender, as also in P. Pennsyl. This = 159 H.H. 247 Lam. et Willii (3) of Mungo, it is probably P. Perchicola, Nutt. A stands form is for 217, Van 16b, P. Brougman's Prince, var., + P. rubricans? with 3-5 leaflets seem to be the same. Mr. (1) Mungo 179 and. 5000 Ba. g. Bridge + other collectors, Nebraska to Cali' Sout- less Wall's Plant though the glandular character of the pubescence is not very obvious. 2 april on the sheet an a form with consider pinnae leaves. A myllying from it is not P. biflora - there is a slight approach to it in 325 it seems distinct. There is nothing so near in Herb. 31 - must be a form of P. dimorphia