. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. POLLINATION IciSy tinued cross-pollination by the st two means, l)ut there is little idence that tlie self-stei-ility now. i often gerniiuate on the stigma, but fertilizaliun does not take place. The einbrvdlogical reasons for this are not clearly understood. About sixty species of plants are known to be more o
. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. POLLINATION IciSy tinued cross-pollination by the st two means, l)ut there is little idence that tlie self-stei-ility now. i often gerniiuate on the stigma, but fertilizaliun does not take place. The einbrvdlogical reasons for this are not clearly understood. About sixty species of plants are known to be more or less self-sterile. (4) The separa- tion of the sexes in different flowers or on different individuals. It is thought by some that there is a gradual evolution among some kinds of plants toward uni- sexuality, and that adaptations for insect- pollination, dichogamy and self - sterility teps in this process. elf-: of Pollination. |)luins, and in gra]M-s. Whenever isolated trees or large blocks of a single variety blossom full, year after year, but drop most of the fruit before it is half-gri>\vn, the trees maybe self-sterile, provided the failure cannot be attributed to fungous disease, insect attack, frost or other in- jury. Familiar examples of self-sterilo varieties are : Wild Goose and Miner plums. Kiefter and Bartlett pears and Esopus Spitzenburg apple. Self-sterility in orchard fruits does not usually result from defectiveness of pollen or pistil, but from a lack of affinity between the two. It is not a constant factor in any variety, but seems to be as easily influenced by the conditions under which the tree is gn^wn as is the size, shape or color of the fruit. The adaptation of a variety to f efore, do with i iftei ity. Sprengel, Kni-lii. 1 . 1. \l experiments. 11 - i ili tinued self-fen; !\ 1 in inferior oil 1 - zation, within â â _).:, vigor to the ..n _ ' ' ⢠::..n between diff. 1. : .nir plant has ii*u;:,,. :. |.].i. ,.. an- tage. The rea,
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