264 PITTONIA. 
propose should bear the name B. chrysanthemoides I can not 
yet determine, and therefore leave most of the northeastern 
and Virginian forms out of consideration for the present. 
The one which I name B. formosa, by the fact that its heads 
are slightly nodding in fruit, might have been placed in 
the B. cernua series, but that its achenes are those of the B. 
chrysanthemoides aggregate, being flattened and two-awned. 
The several far-western members of the group may be 
named and defined with less risk of creating synonyms. 
Yet even here Mr. Wiegand has created difficulties by un- 
fortunate attempts to apply certain early varietal names. 
/ B. Formosa. Manifestly several feet high, stout and with 
long internodes, glabrous: leaves elliptic-lanceolate, closely 
but slightly serrate, 2 to 6 inches long: heads large, long- 
peduncled, erect in flower, slightly nodding in fruit; bracts 
of outer series far surpassing those of the inner: rays6 to 8, 
oval, very large and showy, more than an inch long and 
nearly a half-inch broad, obtuse though abruptly pointed 
by a small though obvious cusp; tube of disk-corolla not 
slender, much longer than the campanulate limb: achenes 
flat, 2-awned, not margined, the flat face bearing scattered 
retrorsely appressed short hairs, the two angles more closely 
aculeolate. 
A remarkably handsome species, with large long-stalked 
almost dahlia-like heads, which, unless it be a rare plant, 
should have been better known. I know but a single sheet 
of specimens, this occurring in the U. S. Herbarium, accom- 
panied by the very meagre legend “Bidens chrysanthemoides ; 
Delaware Co., Pa.” 
VB. LEPTOMERIA. Slender and almost simple, 2 to 4 feet 
high, sparingly leafy, glabrous: leaves narrowly lanceolate, 
