. Plant studies; an elementary botany. Botany. FLO WEES AND INSECTS 129 least two forms of flowers, wliicli differ from one another in the relative lengtlis of their stamens and styles. In the accompanying illustrations of Honslonia (see Fig. 135) it is to be noticed that in one flower the stamens are short and included in the tube, and the style is long and pro- jecting, with the four stigmas exjiosed well above tlie tube. In the otlier flower the relative lengths are exactly re- V e r s e d , t h e stylo Ij e i n g short and in- cluded in the tube, and tlie stamens long and projecting. It ap
. Plant studies; an elementary botany. Botany. FLO WEES AND INSECTS 129 least two forms of flowers, wliicli differ from one another in the relative lengtlis of their stamens and styles. In the accompanying illustrations of Honslonia (see Fig. 135) it is to be noticed that in one flower the stamens are short and included in the tube, and the style is long and pro- jecting, with the four stigmas exjiosed well above tlie tube. In the otlier flower the relative lengths are exactly re- V e r s e d , t h e stylo Ij e i n g short and in- cluded in the tube, and tlie stamens long and projecting. It appears that the pollen f I'om the sliort sta- mens is most effective upon the stigmas of the short styles, and that the jiollen from the long stamens is most efl'ective upon the stig- mas of tlie long styles ; and as short stamens and long styles, or long stamens and short styles, are associated in the same flower, the pollen must be transferred to some other flower to find its ajipropriate stigma. Tliis means that there is a dilference between the pollen of the short stamens and that of the long ones. In some cases there are three forms of flowers, as in one. Fig. flower Flowers of Houdoiiia, showing two forms of In 1 there are short stamens and a long style ; in 2 long stamens and short style. An insect visiting 1 wiJl receive a band of pollen abont the front part of its body ; upon visiting 2 this band will nib against the stigmas, and a fresli pollen band will be received upon the hinder part of the body, which, npon visiting another flower like No. 1, will brush against the stigmas.— After Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Coulter, John Merle, 1851-1928. New York, D. Appleton and Company
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