250 Notes on Cnothera. : [ ZOE 
leaves ought to have no weight. They both have white shreddy 
stems, G2. trichocalyx being more frequently red than white. The 
flowers and capsules do not differ sufficiently to be marked. From 
all these considerations I feel compelled to believe that there is but 
one species instead of two. Ihave not had opportunities to observe 
the habits of any of these forms, but all are white -flowered and of 
course open in the evening. 
_ Zinothera coronopifolia Torr. & Gray. Next to @. dzennis, this 
seems most widely distributed. The flowers have a strong, sicken- 
ing odor, and open before sunset. The style which is at first erect 
and longer than the stamens becomes declined as in Epzlobium 
spicatum. It is not fertilized in the bud. The flowers remain open 
until nearly noon the next day and seem to gradually wither, 
changing from white to rose color. They are not quite an inch in 
diameter, and often there are several in bloom at once on the low 
but erect stem. There are two rows of seeds in each cell as in 
those of CZ. pinnatifida. 
CEnothera cespitosa Nutt., is the most variable of all the species, 
especially in its manner of growth, seeming to change so as to 
adapt itself to different conditions, or rather those that became best 
adapted prevailed and transmitted their qualities to the new genera- 
tions. The form from Steamboat Springs in Routt county, Colorado, 
has pods on peduncles from a half-inch to an inch long. It is caes- 
pitose. I have not seen the flower. The Mancos form is ceespitose 
from running root-stocks, with slightly angled sessile pods. The 
petals are deeply obcordate. At Grand Junction there are three 
forms: first, the typical czespitose form; second, that with simple erect 
stem, the flowers in the axils and the dry stem of winter thickly 
covered with large ridged-winged sessile pods; and third, the inter- 
mediate, with stems branching from the base above ground, instead 
of underground, as in the Mancos form. The first is the common 
mountain form, the second is found at Pueblo and near Colorado | 
Springs in the same kind of adobe soil in which it lives at Grand 
Junction. The axis of the two last forms is succulent, and doubt- 
less holds a supply of moisture to ripen the fruit during the dry 
season that always follows the spring rains. * The capsules are 
strongly winged and sessile. The flowers of this species are not 
fertilized in the bud. I watched the Mancos form and found that 
the flowers expanded almost at sunset, quite gradually but notice- 
