[chap. D1C HO GA MO U S PLANTS. 32 do easily, though on the other hand, from the same cause, it is impossible for them to return. Thus they are imprisoned in the flower ; gradually, however, the pistil passes maturity, and the stigma ceases to be capa¬ ble of fertilisation, while the stamens ripen… … Fig. 29.— Diagram- is impossible, therefore, that the plant Arum. sXhairs°-" should fertilise itself. Nor can the pol- stigmas. , len be carried by wind. When it is shed it drops to the bottom of the tube, where it is so effectually sheltered that nothing short of a hurricane could dislodge it ;…
Flowers -- Color · Plants -- Variation · Fertilization of plants
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