. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 388 ANGIOSPERMAE—DICOTYLEDONES (Pyrenees) a short-tongued bee, a beetle, and 2 flies (op. cit., iii, 1891, pp. 433-43)- H. de Vries saw the honey-bee in the Netherlands (Ned. Kruidk. Arch., Nijmegen, 2. sen, 2. deel, 1875). In Dumfriesshire, Apis (freq.), a humble-bee, a Dolichopodid, and another fly were recorded (Scott-Elliot, ' Flora of Dumfriesshire,' p. 64). Hermann Miiller also observed extra-floral nectaries on the hawthorn : a sweet sap sometimes ooz
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 388 ANGIOSPERMAE—DICOTYLEDONES (Pyrenees) a short-tongued bee, a beetle, and 2 flies (op. cit., iii, 1891, pp. 433-43)- H. de Vries saw the honey-bee in the Netherlands (Ned. Kruidk. Arch., Nijmegen, 2. sen, 2. deel, 1875). In Dumfriesshire, Apis (freq.), a humble-bee, a Dolichopodid, and another fly were recorded (Scott-Elliot, ' Flora of Dumfriesshire,' p. 64). Hermann Miiller also observed extra-floral nectaries on the hawthorn : a sweet sap sometimes oozes from the tips of the young twigs, which is licked by bees (Anthophora pilipes F. S, Bombus terrester L. 5, Andrena sp. S) and wasps (Odynerus parietum L. 5). H. Schiitte (Elsfleth) saw large numbers of wasps (Vespa germanica F.) attracted by the juice exuding from the Psylla larvae which live on the hawthorn. He also noticed a humble-bee (Bombus terrester L.) licking this juice. 925. C. monogyna Jacq.—The flowers of this species agree with those of C. Oxyacantha as regards their mechanism. Visitors.—I observed the same insects in the island of Pellworm as for C. Oxyacantha (q. v.).. Fig. 122. Co/oneasier integerrima. Medic, (after Herin. A. Flower seen from the side and somewhat obliquely from above. B. The same, seen Ironi above. C. The same, rn longitudinal section. (X 7.) w, nectary. 263. Cotoneaster Rupp. Flowers white or red; homogamous or protogynous; with concealed nectar secreted by the fleshy inner wall of the receptacle. 936. C. integerrima Medic. ( = C. vulgaris Zzwrf/., and Mespilus Cotoneaster Z.). (Herm. Miiller, ' Alpenblumen,' pp. 214-15 ; Schulz,' Beitiage,' H, pp. 70-1.)— The blossoms of this species are wasp flowers, with persistent stigmas. They are protogynous in the Alps, but homogamous to protogynous at Halle and in North Thuringia (Schulz). The petals and stamens bend so closely together over the nectar as to leave but a small passage
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