Archive image from page 306 of The different forms of flowers The different forms of flowers on plants of the same species differentformsof01darw Year: 1877 Chap. VII. POLYGAMOUS PLANTS. 295 the pistils in the males. The pistil varies consi- derably in length in the female plants, so that they may be divided into two sub-forms according to the Fig. 14. Long-styled Short-styled female. female. RhAMNUS CATIIARTICUS. length of this organ. Both the petals and sepals are decidedly smaller in the females than in the males; and the sepals do not turn downwards, as do those of the male flowers wh
Archive image from page 306 of The different forms of flowers The different forms of flowers on plants of the same species differentformsof01darw Year: 1877 Chap. VII. POLYGAMOUS PLANTS. 295 the pistils in the males. The pistil varies consi- derably in length in the female plants, so that they may be divided into two sub-forms according to the Fig. 14. Long-styled Short-styled female. female. RhAMNUS CATIIARTICUS. length of this organ. Both the petals and sepals are decidedly smaller in the females than in the males; and the sepals do not turn downwards, as do those of the male flowers when mature. All the flowers on the same male or same female bush, though subject to some variability, belong to the same sub-form; and as my son never experienced any difficulty in decid- ing under which class a plant ought to be included he believes that the two sub-forms of the same sex do not graduate into one another. I can form no satisfactory theory how the four forms of this plant originated. Bliamnus laneeolatus exists in the United States, as I am informed by Professor Asa Gray, under two hermaphrodite forms. In the one, which may be called the short-styled, the flowers are sub-solitary, and in- clude a pistil about two-thirds or only half as long as that in the other form ; it has also shorter stigmas. The stamens are of equal length in the two forms ; but the anthers of the short-styled contain rather less pollen, as far as I could judge from a few dried flowers. My
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