. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. s \, Fig. 4. Lylhfum salicaria, L. (after Herm. Miiller). (i) Long-styled flower. Seen from above, after removal of the upper third of the calyx, corolla, and stamens. (2) Flower with style of medium length similarly treated. (3) Flower with short style similarly treated — a. Long stamens and style. b. Medium stamens and style, c. Short stamens and style. (4) Flower with medium style seen obliquely from the right front. Trimorphous flowers differ from one an
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. s \, Fig. 4. Lylhfum salicaria, L. (after Herm. Miiller). (i) Long-styled flower. Seen from above, after removal of the upper third of the calyx, corolla, and stamens. (2) Flower with style of medium length similarly treated. (3) Flower with short style similarly treated — a. Long stamens and style. b. Medium stamens and style, c. Short stamens and style. (4) Flower with medium style seen obliquely from the right front. Trimorphous flowers differ from one another in similar ways to the dimorphous, as regards size of stigmatic papillae, pollen-grains, and the like In the typical trimor- phic plant LythiTim Salicaria, the pollen-grains of the long stamens are the largest, those of the medium stamens are of inter- mediate size, and those of the short stamens the smallest; the anthers of the long stamens are green, those of the medium and short are yellow; the filaments of the long stamens are red, those of the medium and short are green; the stigmatic pa- pillae of the long-styled flowers are noticeably longer than those of the medium, and these are a little longer than those of the short-styled; the seeds of long-styled flowers are larger than those of medium-styled flowers, and these again are larger than those of short-styled flowers. Epigaea, according to Asa Gray, has even tetramorphous flowers, differing from one another partly in the length of the style, partly in regard to the stigma and anthers. ^V l^ Skirfi §y. Fig. 5. Diagram of i/te possible legitimate and illegi- tifnate unions in a dimorphous plant (Primula) (after Darwin). The arrows indicate the anthers from which pollen must be brought to the stigma of either of the two forms, so as to give a legitimate union (the straight horizontal lines), or an illegitimate union (the curved lines on right and left). <Loew.). Please note that these images are extracted from
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