494 BOTANICAL GAZETTE [DECEMBER 
, 
(which are tetragonal and lack wings), GRAy’s type is a true Bidens. The asso- 
ciate types collected by Parry and PALMER (488 and 4883, not “448 and 4484” 
as erroneously printed in Gray’s original citation), in the Gray Herbarium, 
match very well SCHAFFNER’S no. 202, the type. The name here given for this 
species should not be confused with the same name given years ago by ScHULTz 
Breontinus to B. anthemoides on a herbarium label, but never published by 
im. 
BIDENS TENUISSIMA Greene, Leafl. Bot. Crit. 1: 200. 1906.— 
This species, termed Bidens tenerrima on the labels of the type col- 
lection, was originally described by GREENE as “‘a gigantic ally of 
B. connata but with almost minute heads.” And indeed, when the 
specimens are compared with the true, ternate-leaved B. connata 
Muhl., the difference in the heads is striking.” On carefully com- 
paring them, however, with tall slender forms o B. discoidea (T. & 
G.) Britton, I am unable to find any specific difference. GREENE’S 
type, also the severa excellent cotypes in various United States 
herbaria, should be retained as merely tall, slender forms of B. 
discoidea (T. & G.) Britton. 
BIDENS DAHLIOIDES Watson, Proc. Amer. Acad.26: 142. 1891.— 
At times bearing only erostrate achenes and in this respect simulat- 
ing Bidens, to which genus it had already been referred under 
different names by earlier writers. But from the involucre, the 
‘ligules, and the frequently occurring rostrate achenes, it is seen to 
be a true species of Cosmos. As such it was described long before 
by Orro, under the name Cosmos diversifolius, and one may well 
conclude that Watson merely overlooked Orro’s species by mis- 
take. 
BIDENs Incisa (J. B. Ker) G. Don.—Coreopsis incisa J. B. Ker, 
Bot. Reg. 1:7. 1815; Bidens incisa G. Don, Sweet Hort. Brit. ed. 
3:360. 1839; Bidens reptans (L.) G. Don, var. tomentosus O. E. 
Schulz, Urb. Symb. Antill. 7: 141. 1911. 
KER very justly separated this species from the smooth-stemmed B. 
reptans (L.) G. Don. He laid too much stress, however, upon the “indented 
ray” of the latter species, this character varying too much to be of certain 
value. The recently described B. reptans tomentosa O. E. S., based on GEO. E. 
NICHOLS’ no. 137, is merely a slightly smaller-leaved form of B. incisa (L.) 
G. Don, the terminal leaflets being less than “about two inches long.” A 
study of several other collectors’ specimens, notably at the New York Botanical 
Garden, some of which Dr. Brrrron had already labeled Bidens incisa, showed 
