. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. PRIMULACEAE 63 The narrowness of the corolla-tube protects the nectar from rain-drops, which are unable to displace the air. Kerner states that many species are heterostylous. 1803. A. septentrionalis L. (Herm. jNIuller,'Alpenblumen,'p. 35S ; Kerner, 'Nat. Hist. PI.,' Eng. Ed. i, II, p. 341.)—The white flowers of this species are only 6 mm. in diameter. {C/. Fig. 237.) Kerner says that automatic self- pollination is ultimately ef- fected by contact of the an
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. PRIMULACEAE 63 The narrowness of the corolla-tube protects the nectar from rain-drops, which are unable to displace the air. Kerner states that many species are heterostylous. 1803. A. septentrionalis L. (Herm. jNIuller,'Alpenblumen,'p. 35S ; Kerner, 'Nat. Hist. PI.,' Eng. Ed. i, II, p. 341.)—The white flowers of this species are only 6 mm. in diameter. {C/. Fig. 237.) Kerner says that automatic self- pollination is ultimately ef- fected by contact of the anthers and stigma. Visitors.—Herm. Miiller observed an Empid, a Syrphid, and 3 IMuscids. 1804. Willd. (Herm. ^Miiller, 'Al- penhlumen,' pp. 358-9.)—In this species the flowers are 7-8 mm. in diameter. The nectar-guide is at first yellow in colour, but becomes car- mine-red after polUnation has been effected. Should insect- visits fail, the latter takes place automatically by the fall of pollen. (C/. Fig. 238.) Visitors.—Herm. IVIiiller observed 15 flies, 4 Lepidoptera, and a Fig. 2^7. Aiidrosacc septciib'totialis^ L. (after Herm. M'iller). A. Flower seen directly from .above. B. Do. in longitudinal section. C. Pistil seen otiliquely from abo\ c { x 7).. 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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