. Handbook of flower pollination : based upon Hermann MuÌller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 36 ANGIOSPERMAEâDICOTYLEDONES. Fig. 232. Cassiope tetragona, D. Don (after E. Wanning). A. Diagram of a flower seen from the side (x 4), B. A stamen. C- Diagrammatic plan of the same. D. Longitudinal section of a flower (x 4). E. Stamens and stigma seen fn m below (â 10). 522. Cassiope D. Don. Bell-shaped pendulous flowers, with nectar secreted by yellow nectaries at the base of the ovary. 1760. C. tetragona D. Don. (Warming, Bot. Tids., Kjobenhavn, xv, 1885
. Handbook of flower pollination : based upon Hermann MuÌller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 36 ANGIOSPERMAEâDICOTYLEDONES. Fig. 232. Cassiope tetragona, D. Don (after E. Wanning). A. Diagram of a flower seen from the side (x 4), B. A stamen. C- Diagrammatic plan of the same. D. Longitudinal section of a flower (x 4). E. Stamens and stigma seen fn m below (â 10). 522. Cassiope D. Don. Bell-shaped pendulous flowers, with nectar secreted by yellow nectaries at the base of the ovary. 1760. C. tetragona D. Don. (Warming, Bot. Tids., Kjobenhavn, xv, 1885, pp. 25-9.)âWarming thinks this arctic species possibly belongs to flower class Lm. The yellowish-white flowers exhale an odour of hawthorn, especially towards evening. The pollen is scattered by the impact of the proboscis of insect visitors against the diverging appendages of the anthers. Crossing by insects is possible, but in Greenland automatic self- pollination generally takes place while the flowers are closed. The species is abundant on heaths in Spitzbergen, and Ekstam says that its pendulous flowers erect themselves when anthesis is over ('Bliitenbiol. Beob. a. Spitzbergen,' p. 9). It blossoms in that island from the end of June to the middle of September, and sets abundant fruits (Andersson and Hesselman, ' Bidrag till Kanned. om Spetsbergens o. Beeren Eil. Karlvaxtflora,' p. i8). Vanhoffen was unable to perceive the odour of hawthorn described by Warming (Abromeit, 'Bot. Ergeb. von Drygalski's Gronlandsexped.,' p. 49). Visitors.âEkstam observed numerous small insects in Spitzbergen. 1761. C. hypnoides D. Don (=r Andromeda hypnoides Z.). (Warming, op. cit., pp. 29-31.)âWarming describes the flowers of this species as white with purple-red corolla-lobes. They are more widely open than those of the last species, and Lindman says that they possess a tolerably strong odour. Warming found the species to be homogamous in Greenland, but on the Dovre- fjeld Lindman ob
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