. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. LEGUMINOSAE 301 either cross- or self-pollination may take place. The latter, however, is ineffective. When the pressure is removed, the parts of the flower return to their original positions. Automatic self-pollination, by the pollen surrounding the stigma of an unvisited flower, does not take place, for it appears that the stigmatic papillae must be rubbed before becoming receptive. Kemer states, however, that the flowers are fertile when insects are exclu
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. LEGUMINOSAE 301 either cross- or self-pollination may take place. The latter, however, is ineffective. When the pressure is removed, the parts of the flower return to their original positions. Automatic self-pollination, by the pollen surrounding the stigma of an unvisited flower, does not take place, for it appears that the stigmatic papillae must be rubbed before becoming receptive. Kemer states, however, that the flowers are fertile when insects are excluded. Warnstorf describes the pollen-grains as very small, shining, white, and smooth, resembling blunt-ended prisms in shape, with a slight constriction in the middle. On an average they are 25 /x long and 12 1^ Fig. 98. Lotus comtculatus, L. (after Henn. Miiller). (i) Flower seen from the front. (2) Flower seen obliqaely from the side. (3) Flower after removal of the vexillura, seen from the side. (4) The same, seen from above. (5) Flower after removal of the vexillum and alae, seen from the side, and more highly magnified. (6) Flower after removal of the right half of the carina, seen from the right side. (7) Flower after removal of the vexillum and alae, seen from above. (8) The stamens, style, and stigma, enclosed in the anterior part of the carina, more highly magniSed than in 6. (9) Stamens, style, and stigma of a bud, immediately after the pollen has been shed ; removed from the flower and seen from the side. The outer filaments have become thicker than they were in S. (10) The same, seen from above; the outer filaments, thickened at the end, spread out, being freed from the pressure of the carina. (i 1} The nine united filaments of a fully developed flower spread out. a, nectar-passage; b^ up- ward bend of the free filament; t, depressions in the two carinal petals, into which projections (c') of thi- alae fit; d^ the five inner filaments that remain short; e^ t
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