436 
A new Species of Bidens. 
By Karu M. WIEGAND. 
Field observations convinced me some time ago that there were 
at least two distinct species included under 2. connata Muhl. In 
order to determine accurately if this was indeed the case, consid- 
erable material was collected during the summer of 1896, which 
was carefully studied in connection with herbarium material from 
various parts of the United States. The original supposition 
proved to be correct, and in addition to the difference in general 
appearance several less obvious but quite as important distinguish- 
ing characters were discovered through the close examination of the 
material. It is possible, therefore,at present to separate from 2. con- 
nata thé form first noticed long ago by Dr. Gray and named by him 
B. connata comosa in the fifth edition of the Manual, but which was 
again later abandoned as not being sufficiently distinct from the 
type. The difference in general appearance between ZB. connala 
and #. comosa is very striking, the stramineous color of the stem, 
foliaceous involucre and pale yellow flowers of the former being 
quite in contrast to the purple stem, small involucre and orange 
flowers of 4. connata. Mr. E. P. Bicknell writes me that he has 
observed practically the same differences between the two species, 
and I am much indebted to him for the use of his valuable field 
notes. The following description has been prepared to bring out 
more in detail the characters of this neglected species: 
’ BIDENS CoMosA (Gray) n. sp. 
’ B. connata var. comosa Gray, Manual, ed. 5; 261. 1867. 
Stem 2-10 dm. high, rather strict and stout, stramineous, a 
well as the comparatively short simple branches; leaves simple, 
lanceolate or elongate-lanceolate, coarsely serrate with mostly 
smaller and more ascending teeth than in B. connata 
green, gradually tapering toward each : 
broadly margined, connected at the base by a narrow ring, the 
acute or slightly acuminate apex mostly entire and blunt, glabrous 
except the margin, veins parallel, ascending, terminating either in 
the teeth or sinuses; heads cymosely a 
branches, therefore often appearing ciust 
high by 15 mm. broad), densely flowered; outer involucre very 
end; petioles short al 
pale, dull 
tranged on short stout 
ered, large (12-15 mm. 
