1919] Weatherby,— Notes on Impatiens biflora 99 
the greater part of the perianth — is cream-color. Cream is the 
ground-color of the flower; and ground-color is the basis I used in 
delimiting the forms of J. biflora and, I am convinced, the only prac- 
ticable one. Forma Peasei is, then, essentially only a phase of f. 
albiflora t in which the pink spots frequently present in that form are 
very numerous and coalescent into solid patches of pink. 
Such a phenomenon occurs commonly enough in both the typical 
form and f. citrina. In the former, flowers with few, scattered spots 
and with very many spots merging into broad patches of crimson 
have been observed on the same plant. However, in these two forms 
the phases with abundant, coalescent spots occur as scattered indi- 
viduals, mingled with typical plants and likely to be found wherever 
they are. Forma Peasei, on the contrary, occurs in the White Moun- 
tain region in pure colonies and there appears to take the place of 
f. albiflora nearly or quite completely. In view of this more definite 
segregation and of its undoubtedly striking appearance, f. Peasei may 
be allowed to stand, at least pending further investigation. Its 
description, however, should be amended to read: “Perianth cream- 
color, the pink spots numerous and coalescent on the inner surfaces 
of the spreading perianth-parts into patches of solid pink." 
I. BrFLORA, forma platymeris f. nov.— Petalorum lobis basalibus 
dilatatis magnis, apicale aequantibus. Basal lobes of the petals large, 
equalling the apical in size and often over-lapping them.—Moist, 
shaded ground, with the typical form, Southbury, Connecticut, August 
13, 1918, Una F. Weatherby (Herb. C. A. Weatherby, no. 4357). 
This interesting form was detected by Mrs. Weatherby during one © 
of the summer field meetings of the Connecticut Botanical Society. 
In the typical form of I. biflora, the petals are unequally two-lobed 
on the outer edge, the basal lobe being small, about one-half the size 
of the dilated apicallobe. In f. platymeris, the basal lobe is about as 
large as the apical, or even slightly larger, and often over-laps it, 
giving the flower the appearance of being partially doubled. The 
accompanying sketches show these differences. If, as is supposed, 
the two-lobed petals of Impatiens have resulted from the union of 
two petals of a simpler and more regular ancestral flower, f. platymeris 
1 It should be remembered that Rand & Redfield’s original description of f. albiflora was 
drawn to cover both white and cream-colored flowers. Only the latter were seen, however; 
and the name, though inappropriate, must be retained for that form. See Rnopona, l. c. 
