350 READINGS IN EVOLUTION, GENETICS, AND EUGENICS 
to be of some utility after slight showers, but was observed to be a 
source of weakness during wet weather in my garden, preventing the 
leaves from drying. Whether the /aevifolia would do better under 
such circumstances, I have, however, omitted to test. 
The flowers of the Jaevifolia are also in a slight degree different 
from those of Jamarckiana. ‘The yellow color is paler and the petals 
are smoother. Later, in the fall, on the weaker side branches these 
differences increase. The /aevifolia petals become smaller and are 
devoid of the emargination at the apex, becoming ovate instead of 
obcordate. This shape is often the most easily recognized and most 
striking mark of the variety. In respect to the reproductive organs, 
the fertility and abundance of good seed, the Jaevifolia is by no means 
inferior or superior to the original species. 
O. brevistylis, or the short-styled evening-primrose, is the most 
curious of all my new forms. It has very short styles, which bring 
the stigmas only up to the throat of the calyx-tube, instead of upwards 
of the anthers. The stigmas themselves are of another shape, more 
flattened and not cylindrical. The pollen falls from the anthers 
abundantly on them, and germinates in the ordinary manner. 
The ovary which in Jamarckiana and in all other new forms is 
wholly underneath the calyx-tube, is here only partially so. This tube 
is inserted at some distances under its summit. The insertion divides 
the ovary into two parts: an upper and a lower one. The upper part 
is much reduced in breadth and somewhat attenuated, simulating a 
prolongation of the base of the style. The lower part is also reduced, 
but in another manner. At the time of flowering it is like the ovary 
of lamarckiana, neither smaller nor larger. But it is only reached by 
very few pollen-tubes, and is therefore always very incompletely 
fertilized. It does not fall off after the fading away of the flower, as 
unfertilized ovaries usually do; neither does it grow out, nor assume 
the upright position of normal capsules. It is checked in its develop- 
ment, and at the time of ripening it is nearly of the same length as in 
the beginning. Many of them contain no good seeds at all; from 
others I have succeeded in saving only a hundred seeds from thousands 
of capsules. 
These seeds, if purely pollinated, and with the exclusion of the 
visits of insects, reproduce the variety entirely and without any 
reversion to the lamarckiana type. 
Correlated with the detailed structures is the form of the flower- 
buds. They lack the high stigma placed above the anthers, which in 
