. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 3i8 ANGIOSPERMAE—DICOTYLEDONES Pieris napi Z.). H. de Vries (Netherlands), the humble-bee Bombus agrorum F. 5 (Ned. Kruidk. Arch., Nijmegen, 2. Ser., 2. Deel, 1875). Willis (neighbourhood of south coast of Scotland), 4 bees, skg. (' Fls. and Insects in Gt. Britain,' Part I)— I. Bombus agrorum F., freq.; 2. B. hortorum Z.; 3. B. terrester Z., freq.; 4. Psithyrus campestris Pz. Scott-Elliot (Dumfriesshire), the honey-bee, 5 humble- bees, and a hover-fly (' Flo
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 3i8 ANGIOSPERMAE—DICOTYLEDONES Pieris napi Z.). H. de Vries (Netherlands), the humble-bee Bombus agrorum F. 5 (Ned. Kruidk. Arch., Nijmegen, 2. Ser., 2. Deel, 1875). Willis (neighbourhood of south coast of Scotland), 4 bees, skg. (' Fls. and Insects in Gt. Britain,' Part I)— I. Bombus agrorum F., freq.; 2. B. hortorum Z.; 3. B. terrester Z., freq.; 4. Psithyrus campestris Pz. Scott-Elliot (Dumfriesshire), the honey-bee, 5 humble- bees, and a hover-fly (' Flora of Dumfriesshire,' p. 141). 2381. T. Chamaedrys L. (Herm. Miiller, ' Alpenblumen,' pp. 309-11 ; Schulz, ' Beitrage,' II, pp. 197, 222 ; Loew,' Bliitenbiol. Floristik,' p. 400 ; Kirchner, ' Flora V. Stuttgart,' p. 638.)—The mechanism of the purple-red flowers of this species agrees essentially with that of T. Scorodonia, but the stamens do not bend back so far. Hermann Miiller states that the style is about the same length as the short stamens; Schulz, however, says that it now and then projects 1-3 mm. beyond the long stamens, so that automatic self-pollination is excluded in such flowers. It can be effected in those with short styles, for the stigma is dusted with pollen still clinging to the anthers as it glides between them. A proboscis of 7-10 mm. is necessary in order to suck all the 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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