. A text-book of elementary botany. Botany. 52 ELEMENTARY BOTANY. contact with long and short pistils respectively, the pollen of one flower would in each case be applied to the stigma of an- other flower; or, in other words, cross-pollination would neces- sarily result. It is found, besides, that the pollen grains of the two sets of stamens are of different sizes, and each less active upon its own stigma than upon the stigma of another flower. In some genera three sets of flowers with stamens and pistils of differing lengths exist (trimorphism), evidently designed for intercrossing. 10. There
. A text-book of elementary botany. Botany. 52 ELEMENTARY BOTANY. contact with long and short pistils respectively, the pollen of one flower would in each case be applied to the stigma of an- other flower; or, in other words, cross-pollination would neces- sarily result. It is found, besides, that the pollen grains of the two sets of stamens are of different sizes, and each less active upon its own stigma than upon the stigma of another flower. In some genera three sets of flowers with stamens and pistils of differing lengths exist (trimorphism), evidently designed for intercrossing. 10. There are other adaptations for cross-pollination besides dichogamy and dimorphism. An interesting case is furnished by papilionaceous flowers ; for example, the Pea (Figs. 79-81).. 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 Kellerman, William Ashbrook, 1850-1908. Philadelphia, Eldredge & Brother
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