. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 53° ANGIOSPERMAE—DICOTYLEDONES climbing shrub had been cuUivated there, and grown very luxuriantly, the bloom being remarkably fine during that year. I found very noticeable deviations from the description of Hermann Muller. The buds are vertical, and the anthers dehisce within them between 6 and 7 ; the stigma becoming receptive at the same time. But automatic self- pollination cannot take place, because the stigma projects 2 mm. beyond the longest stam
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 53° ANGIOSPERMAE—DICOTYLEDONES climbing shrub had been cuUivated there, and grown very luxuriantly, the bloom being remarkably fine during that year. I found very noticeable deviations from the description of Hermann Muller. The buds are vertical, and the anthers dehisce within them between 6 and 7 ; the stigma becoming receptive at the same time. But automatic self- pollination cannot take place, because the stigma projects 2 mm. beyond the longest stamens. {C/.Yig. 175, i.) The first flowers open about 7 o'clock; by 8 most of the flowers have already closed. The lower lip of the corolla first separates from the upper one, then the stamens successively protrude from under the latter, while the end of the style is still held fast by its hood-like tip. More rarely the style protrudes before the stamens. The flower now gradually sinks, passing from the vertical to the horizontal position. This rotation through 90° is complete by the time the style and stamens have escaped from the upper lip, and the former curves down between the stamens till it rests on the horizontal or at first slightly curved Fig. 174. Loniixra CaprifoUuin^ L, (after Herm. Waller). (i) Flower, natural size, seen from the side. (2) Ditto, seen from the front. The stigma projects beyond the anthers, and is therefore first touched by visitors, so that it receives pollen from other flowers. At the same time a strong odour is exhaled ; this is very faint during the day. Hover-flies (Syrphus sp.) at once make their appearance, and settle on the anthers to devour the pollen, though frequently they alight on the stigma, and must therefore occasionally effect crossing. The versatile anthers are placed in front of the entrance to the flower, with their dehisced sides facing upwards or outwards, so that the pollen which covers them must be rubbed off' by
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