. Handbook of flower pollination : based upon Hermann MuÌller's work 'The fertilisation of flowers by insects' . Fertilization of plants. ERICACEAE 37 â white flowers, the corolla-lobes of which are of a purple-red colour (op. cit., p. 49). Nathorst found it in full bloom in Spitzbergen ( '68) (Andersson and Hesselman, op. cit., p. 12). 3. Tribe Ericeae. 523. Calluna Salisb. Feebly protandrous, pinkish-red, rarely white flowers, aggregated into racemes ; with concealed nectar, secreted in the base of the flower by eight little swellings alternating with the filaments. 1762. C. vulgaris Sal
. Handbook of flower pollination : based upon Hermann MuÌller's work 'The fertilisation of flowers by insects' . Fertilization of plants. ERICACEAE 37 â white flowers, the corolla-lobes of which are of a purple-red colour (op. cit., p. 49). Nathorst found it in full bloom in Spitzbergen ( '68) (Andersson and Hesselman, op. cit., p. 12). 3. Tribe Ericeae. 523. Calluna Salisb. Feebly protandrous, pinkish-red, rarely white flowers, aggregated into racemes ; with concealed nectar, secreted in the base of the flower by eight little swellings alternating with the filaments. 1762. C. vulgaris Salisb. (=Erica vulgaris Z.). (Sprengel, ' Entd. Geh.,' p. 230; Herm. IMuUer, 'Fertilisation,' pp. 377-80, ' Alpenblumen,' p. 382, ' Weit. Beob.,' Ill, p. 67 ; Lindman, ' Bidrag till Kanned. om Skandin. Fjellvaxt. Blomn. o. Befruki.'; Verhoeff, ' Bl. u. Insekt. a. d. Ins. Norderney'; de Vries, Ned. Kruidk. Arch., Nijmegen, 2. Ser., 2. Deel, 1875 ; IMacLeod, Bot. Jaarb. Dodonaea, Ghent, iii, 1891, V, 1893; Knuth, ' Bl. u. Insekt. a. d. nordfr. Ins.,' pp. loi, 163, 'Weit. Beob. ii. Bl. u. Insekt. a. d. nordfr. Ins.,' pp. 227, 238 ; Kerner, ' Nat. Hist. PI.,' Eng. Ed. i, II, p. 139; Loew, ⢠Bliitenbiol. Floristik,' p. 390; Warnstorf, Verh. bot. Ver., Berlin, xxxviii, 1896.)âThe attraction of i nsects effecting cross-pollination is brought about by the enlarged red, rarely white calyx, the aggregation of the flowers into dense unilateral racemes, and last, but not least, by the asso- ciation together of vast numbers of plants. Hermann Miiller describes the flowers as feebly protan- drous, with small bells 2-3 mm. in length. The stamens and pistil are so bent up in the almost horizontal blossoms that the nectar is conveniently accessible from below. The larger insects (bees and humble-bees) hang on to the flowers, pulling them down by their weight, and suck from below ; the smaller ones, on the contrary, push their head or proboscis into the flowers from the front in order to sec
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