...the stigma in order to ensure full fertility, there is at least a good chance of cross-fertilisation. I do not, however, believe that if all known plants...structure; and such flowers often require insect-aid. Thus out of the forty-nine genera in the first list, about thirty-two have flowers which are asymmetrical...

...the stigma in order to ensure full fertility, there is at least a good chance of cross-fertilisation. I do not, however, believe that if all known plants...structure; and such flowers often require insect-aid. Thus out of the forty-nine genera in the first list, about thirty-two have flowers which are asymmetrical...

...plants more or less self-fertile, and the other self-sterile without insect aid ; but he a'lds : — " I do not, however, believe that if all known plants...found to be sterile within the specified limits." f 2. Very few plants are known to be physiologically selfsterile when the pollen of a flower is placed...

...Pert., etc. , pp. 357 and 365), one of self-sterile, the other of self-fertile plants, and adds, " I do not, however, believe that if all known plants...remarkable structure ; and such flowers often require insect aid " (Ie, p. 270). The proportion of self-sterile plants is, in fact, extremely small. Miiller...

...Self Fert., etc., pp. 357 and 365), one of self-sterile, the other of self-fertile plants, and adds, " I do not, however, believe that if all known plants were tried in the same manner, half wonld be found to be sterile within the specified limits; for many flowers were selected for experiment...

...striking one ; for whenever pollen has to be carried from the anthers to the stigma in order to insure full fertility, there is at least a good chance of...and Red Clovers) have a place in the first list ; T. arvense and T. procumbens in the second. Darwin refers to Mr. Miner's statement that " in the United...

...striking one ; for whenever pollen has to be carried from the anthers to the stigma in order to insure full fertility, there is at least a good chance of...Trifolium repens and T. pratense (the common White and Eed Clovers) have a place in the first list ; T. arvense and T, procumbens in the second. Darwin refers...

...the stigma in order to ensure full fertility, there is at least a good chance of cross-fertilisation. I do not, however, believe that if all known plants were tried in the sanie manner, half would be found to be sterile within the specified limits ; for many flowers were...