. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. LEGUMINOSAE 263 present that despite the absence of nectar, and the whip-like action of the style, the bee continues to visit other flowers. While the honey-bee is obliged to make considerable efforts before it can effect explosion, the stronger and heavier humble-bees (Bombus terrester and B. lapidarius) do this with the greatest ease. Cross-pollination takes place because the style springs out of the carina a moment sooner than the stamens, so that the sti
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. LEGUMINOSAE 263 present that despite the absence of nectar, and the whip-like action of the style, the bee continues to visit other flowers. While the honey-bee is obliged to make considerable efforts before it can effect explosion, the stronger and heavier humble-bees (Bombus terrester and B. lapidarius) do this with the greatest ease. Cross-pollination takes place because the style springs out of the carina a moment sooner than the stamens, so that the stigma of the second flower visited is dusted with foreign pollen. Even the first flower visited will very probably be crossed, though its own pollen lies all around, for the style rolls up to such an extent that the stigma once more faces upwards, so that subsequent visitors may still effect cross-pollination. The honey-bee and humble-bees hardly ever settle on exploded flowers, which are almost exclusively visited by smaller bees, hover-flies, or flower-beetles. Failing visits from humble-bees or the honey-bee, explosion does not take place. Darwin states that in this case the flowers remain Fig. 82. SarothamTius scoparitts, Koch (after Herm. MiiUer). (1) Flower seen from the side. (2) The same with vexillum somewhat more erect, to show the nectar-guides ; seen from the right front. (3) The same after removal of the vexillum, seen from above. (4) The same, after removal of the alae. (4 b) The left ala, seen from the inner side, showing the fold_/i which lies upon a projection (4 c and 6y') of the carina, (4^:) The projection of the carina, seen from the front. (5) Position of the stamens and pistil in the unexploded flower. (6) Flower after explosion of the short stamens and removal of the vexillum and alae ; seen from the side. (7) Position of the parts after explosion. (8) Staminal tube, split longitudinally to the right of the posterior stamen (1) and spread ou
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