. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. Fig. 24,^. Primula villosa, Jacq. (?) (after Herm. Miillerl. Short- and long-styled flowers, seen from the side (natural size). Do., seen from above. E, F. Do. in longitudinal section. A, B. C,D. (=P. latifolia Koch, and P. graveolens Heg). (Herm. Miiller, ' Alpenblumen,' pp. 367-9.)—This species bears dimorphous heterostylous butterfly flowers. The corolla-tube is so narrow, that between it and the stigma the distance is scarcely i mm., and consequendy the.
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. Fig. 24,^. Primula villosa, Jacq. (?) (after Herm. Miillerl. Short- and long-styled flowers, seen from the side (natural size). Do., seen from above. E, F. Do. in longitudinal section. A, B. C,D. (=P. latifolia Koch, and P. graveolens Heg). (Herm. Miiller, ' Alpenblumen,' pp. 367-9.)—This species bears dimorphous heterostylous butterfly flowers. The corolla-tube is so narrow, that between it and the stigma the distance is scarcely i mm., and consequendy the. Fig. 244. Primula viscosa, L. (after Herm. Miiller). A, B. Short- and long-styled flowers, partly dissected ( X 2). C, D. Stigmas of do. (.x 7). E, F. Stigmatic papillae of do. G,H. DrypoUcn. grains of do. J, K. The same, moistened. L. Cross-section of a flower just above the stigma (X 7). nectar can only legitimately be sucked by the proboscis of a lepidopterous insect, which must at the same time touch the anthers and stigma. The requisite length of proboscis is 12-14 mm.' {Cf. Fig. 244.) Visitors.—Herm. Miiller only observed useless (Rhingia campestris Mg.) and injurious (Bombus mastrucatus Gersl., stealing nectar) Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Knuth, Paul, 1854-1899; Knuth, Paul, 1854-1899; Mu?ller, Hermann, 1829-1883; Ainsworth Davis, J. R. (James Richard), 1861-1934. Oxford : Clarendon Press
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