. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. CRUCIFERAE 83 54. Arabis L. Flowers usually small, seldom of considerable size; white or whitish, rarely rose-red or lilac or blue; generally homogamous, infrequently protogynous. Nectar half-concealed; nectaries 2, 4, or 6. 182. A. alpina L. (Sprengel, 'Entd. Geh.,' p. 333; Axell, 'Om Anord. for Fanerog. Vaxt. Befrukt.'; Herm. Mttller,' Alpenblumen,' pp. 143-4; Schulz,' Beitrage,' II, pp. 11-2.)—The flowers are homogamous. Of the four nectaries those outsid
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. CRUCIFERAE 83 54. Arabis L. Flowers usually small, seldom of considerable size; white or whitish, rarely rose-red or lilac or blue; generally homogamous, infrequently protogynous. Nectar half-concealed; nectaries 2, 4, or 6. 182. A. alpina L. (Sprengel, 'Entd. Geh.,' p. 333; Axell, 'Om Anord. for Fanerog. Vaxt. Befrukt.'; Herm. Mttller,' Alpenblumen,' pp. 143-4; Schulz,' Beitrage,' II, pp. 11-2.)—The flowers are homogamous. Of the four nectaries those outside the bases of the two short stamens are the largest; their nectar collects in the dilatations of the sepals beneath them. The two smaller nectaries outside and between the bases of each pair of long stamens, secrete hardly any nectar. The form of the nectaries is very variable. The long stamens sometimes turn their pollen-covered sides towards the adjacent short stamens, so that an insect probing for nectar must touch them, and therefore cross-pollination is likely to take place. In other cases these stamens turn towards the stigma, and then, especially in dull weather (and always in Greenland), either pollen falls from them on the stigma, or. 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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