528 
Explanation of Plates 282 and 283. 
Fig. t. Agrimonia hirsuta (Muh). 
AMET S bg Brittoniana n, sp. 
3 oe mollis (T. & G.) Britton, 
4 “ mollis var. 
5. “ pumila Muhl. 
Pe Oy “ striata Michx. 
7 “6 parviflora Soland. 
8 “ incisa T. & G. 
Geum Canadense flavum (Porter) Britton, a valid species, 
By Evucene P. BICKNELL. 
This plant is clearly an excellent species and should stand as 
Geum flavum (Porter). It is common in the vicinity of New York 
and shows itself to be perfectly distinct from its near relative, Geum 
Canadense Jacq., with which it is often found associated. Its points 
of difference from the latter are by no means confined to the size 
and color of the petals, but involve the pubescence, the form and 
texture of the leaves the branching of the inflorescence and other 
less obvious features. As these characters have never been 
Pointed out, it may be useful to draw attention to them. 
Geum flavum is much more coarsely pubescent below than Can- 
adense, in which the basal petioles and lower part of the stem are 
often glabrate or only sparsely pubescent; in favum the lower 
Stem is hirsute- pubescent, often equally so with Geum Virginianum 
L., the leafstalks spreading-villose. 
The leaves of favum are mostly larger, thinner and duller 
green than in Canadense, often becoming very large and lax. The 
largest in specimens before me are 8’ long by 7’ wide on petioles 
3’ in length, dimensions which greatly exceed anything seen in 
Canadense. The long-petioled basal leaves at flowering time are 
exceedingly multiform, varying from cordate-orbicular through 
trifoliate to pinnate with two or three pairs of leaflets, show- 
ing a much readier tendency to a pinnate form than those of 
Canadense and to the development of small subleaflets on the peti- 
ole. The lower cauline leaves reveal the same tendency to 
greater subdivision than those of Canadense, which are rarely other 
