. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. PRIMULACEAE 65 V JJ \ 7. These results were confirmed by the investigations of Hildebrand, who further proved that when flowers were artificially self-pollinated fertility was at a minimum. By sowing separately the seeds resulting from the different kinds of union, Hildebrand found that when both parents were long-styled the offspring were predominatingly so, and similarly for short-styled stocks. Crosses between the two kinds of stock resulted in off- sprin
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. PRIMULACEAE 65 V JJ \ 7. These results were confirmed by the investigations of Hildebrand, who further proved that when flowers were artificially self-pollinated fertility was at a minimum. By sowing separately the seeds resulting from the different kinds of union, Hildebrand found that when both parents were long-styled the offspring were predominatingly so, and similarly for short-styled stocks. Crosses between the two kinds of stock resulted in off- spring which were long- and short- styled in approximately equal pro- portions. The researches of Darwin and Hildebrand threw entirely new light on the significance of crossing and sexuality in general. 1813. P. elatior Hill. (Herm. Miiller, 'Fertilisation,' pp. 384-5, 'AI- penblumen,' p. 369,' Weit. Beob.,' Ill, pp. 64-5; Schulz, ' Beitrage,' II, pp. 145-6; Kirchner, 'Flora v. Stutt- gart,' pp. 533-4 ; Knuth, ' Bloemen- biol. Bijdragen'; MacLeod, Bot. Jaarb. Dodonaea, Ghent, v, 1893, pp. 444-6.)—This species bears hetero- stylous flowers belonging to class HhL, which do not attain their full size till towards the end of anthesis. The corolla is of pale-yellow colour with a yolk-yellow throat, and its tube differs in length and shape in the long- and short- styled forms. (a) brachystyla: corolla-tube 15-17 mm. long, gradually narrowing to a little distance (3-5 mm.) below the horizontally expanded limb, and then at a level of 12-13 mm. from its base enlarging again. The five anthers, borne on filaments with wider bases, are situated in this enlarged region, and they extend to the opening of the tube, where their tips converge. The pollen-grains are about twice as large as in (b). The relatively thick style is about half the length of the corolla-tube; the stigma is broader than deep, and beset with short papillae. (b) macrostyla : corolla-tube 12-14 ™m- long, widening somewhat i
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