Additions to the flora of Colorado 
GEO. E. OSTERHOUT 
1. Nuttallia hastata sp. nov. 
Biennial, 4-8 dm. high, scabrous throughout as other like 
species of the genus, branched from the upper half, or even lower, 
the branches strict and somewhat fastigiate, flowers from the 
ends of the stem and branches, somewhat cymous; lower leaves 
narrowly linear, 5-10 cm. long, sinuate and bluntly dentate, 
tapering to a petiole, upper leaves linear-hastate, attached by a 
broad base, deeply dentate with sharp teeth, acuminate; flowers 
white, petals eight to ten, about 2 cm. long, the alternate ones 
smaller and more pointed, but seldom anther-bearing; capsules 
variable in length, the longer ones about 3 cm. long, four- to five- 
angled, usually a pair of bracts at the base; seeds under a good lens 
thickly and evenly papillose, wing-margined. 
I have collected Nuttallia hastata at different times in several 
localities in Colorado, North Park, Middle Park, and Glenwood 
Springs, and not far from Jelm Post Office, Wyoming, by the road- 
side, on the east side of the Laramie River. The specimens which 
I have selected for the type were collected near Walden, North 
Park, Colorado, August 6, 1918, No. 5796. It does not closely 
resemble N. nuda (Pursh) Greene or N. stricta (Osterhout) Greene, 
but is what I suppose has been classified as N. Rusbyi (Wooton) 
Rydb. among the Colorado species. The flowers, however, are 
white, not yellow; and the capsule is angled, not cylindrical. 
Professor Wooton, in the original description of N. Rusbyi, 
observed, ‘‘stigma three-parted,” but this is characteristic of a 
number of species, perhaps of the genus. 
There is a peculiarity in the species of Nuttallia in that the 
flowers do not hold their color in the dried state. In the ‘Flora 
of the Rocky Mountains and adjacent plains,’’ Dr. Rydberg says 
of the white flowered species, ‘‘ petals straw-colored,” and this is 
their appaerance by the time they usually reach the herbarium, 
but at the time of opening they are white, as far as I am acquainted 
with them, pure white. 
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