. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. Fig. 28. HuntbU-hec Flowers-with Nectar concealed parlic7tlarly deeply. (i) Aconitum Lycoc- tonum L. (in outline). (2j Corydalis solida Sm. (the corolla-tube has been Ijitten through by Bombas tcrrester). Aconitum Lycoctonum is of particular interest in this connection. The nectar of this flower is hidden so deeply that only insects with an exceptionally long proboscis are able to reach it. Especially interesting is the fact that in central Germany this flow
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. Fig. 28. HuntbU-hec Flowers-with Nectar concealed parlic7tlarly deeply. (i) Aconitum Lycoc- tonum L. (in outline). (2j Corydalis solida Sm. (the corolla-tube has been Ijitten through by Bombas tcrrester). Aconitum Lycoctonum is of particular interest in this connection. The nectar of this flower is hidden so deeply that only insects with an exceptionally long proboscis are able to reach it. Especially interesting is the fact that in central Germany this flower is visited exclusively by Bombus hortorum Z., and in the Alps exclusively by B. opulentus Gersi. 2 . These two humble-bees possess a proboscis longer than that of any other species of the same genus living in the districts named. That of B. hortorum is 21 mm. long, and that of B. opulentus 22 mm. The latter species has hitherto been observed on no other flower. We have here, therefore, vicarious species. In Jamtland (in central Sweden) C. Aurivillius (Hot. Centralbl., xxix, 1887, pp. 125 and 126) frequently observed B. consobrinus Dahlh. acting as a pollinator, in addition to B. hortorum L. Both species are ' particularly well adapted to reach the nectar.' We have here, then, a second vicarious species, characteristic of the ' northern alpine regions,' or perhaps it is only a vicarious variety, for Schmiede- knccht ('Apidae Europ.,' pp. 295, 297,305) describes the former as a race of the latter. Lastly, MacLeod has again met with B. hortorum L. as a visitor of Aconitum. 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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