. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. LEGUMINOSAE 265 until the upper edges of the carinal petals are caused to separate. Each ala possesses a fold which interlocks with an acutely angular projection on the upper margin of the corresponding half of the carina. It therefore follows that when a bee settles on the flower, resting with its limbs on the alae, and thrusting its head under the vexillum, the alar folds slip down the column formed by the filaments and the pistil, and at the same time the
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. LEGUMINOSAE 265 until the upper edges of the carinal petals are caused to separate. Each ala possesses a fold which interlocks with an acutely angular projection on the upper margin of the corresponding half of the carina. It therefore follows that when a bee settles on the flower, resting with its limbs on the alae, and thrusting its head under the vexillum, the alar folds slip down the column formed by the filaments and the pistil, and at the same time the carina splits open above from base to tip. When the splitting has extended as far as the end of the style, the stretched parts suddenly separate, the carina and alae moving down, the style with its superimposed pollen springing up. The stigma thus first touches the ventral surface of the bee, and if this has previously visited another flower of the same species it gets pollinated. Immediately afterwards the pollen is pressed against the under-side of the visitor. If cross-pollination is not effected, self-pollination is. /^ Fig. 83. Genista ttnc/oria, L. (after Herm. Muller). (i) The stamens with style and stigma; taken from a bud. (3) Position of the parts enclosed in the carina in a flower not yet visited by insects. (3)^Right ala, seen from within. (4) Exploded flower. (5) Unexploded flower, after removal of calyx and \exillum ; seen from above. (6) The same, after the carina has been split open almost to tlie tip by pressure from above. (7) Unexploded flower, after removal of vexillum and alae; seen from above (8) Anterior part of a flower split open and about to explode ; seen from above (enlarged to twice the scale of the other Ggures). a, stamens with style and stigma ; d, the four outer stamens that have remained short (2, 4, 8, 10 in Fig. i); c, the five inner stamens (i, 3, 5, 7, q) ; rf, the outer stamen (6) that lies under tlie style ; c, tip of the style ; f, stig
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