. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 36o ANGIOSPERMAE—DICOTYLEDONES von Dalla Torre (Tyrol) saw the bee Halictoides dentiventris Nyl. 5, and Schletterer records the same visitor. Lindman (Dovrefjeld) observed 2 species of flies; and Holmgren (Spitzbergen) Hymenoptera (Hemiteles septentrionalis Holmgr., and Orthocentrus pedestris Holmgr.) and Diptera (Aricia (Spilogaster) dorsata Zett., A. (Chortophila) megastoma Bohem., and Scaeva dryadis Holmgr.), Ekstam noticed several small and medium-sized
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 36o ANGIOSPERMAE—DICOTYLEDONES von Dalla Torre (Tyrol) saw the bee Halictoides dentiventris Nyl. 5, and Schletterer records the same visitor. Lindman (Dovrefjeld) observed 2 species of flies; and Holmgren (Spitzbergen) Hymenoptera (Hemiteles septentrionalis Holmgr., and Orthocentrus pedestris Holmgr.) and Diptera (Aricia (Spilogaster) dorsata Zett., A. (Chortophila) megastoma Bohem., and Scaeva dryadis Holmgr.), Ekstam noticed several small and medium-sized flies in Nova Zemlia. MacLeod saw a short-tongued bee, a hover-fly, and a Muscid in the Pyrenees (Bot. Jaarb. Dodonaea, Ghent, iii, 1891, p. 427). 847. D. integrifolia Vahl.—Warming observed this species in Greenland, and states that both hermaphrodite and male flowers occur there (' Bestovningsmaade af. Fig. 113. Dryas integrifolia^ T'lj/i/(from Greenland ; after E. Warming). A. Entire plant (x %). B. Hermaphrodite flower. C Male flower. D. Protogynous hermaphrodite flower. E. A carpel. F. Tip of a style with germinating pollengiaina. G. Anther. H. A foliage-leaf. nogle gronlandske Blomst.,' pp. 127-8). The hermaphrodite flowers are homoga- mous or slightly protogynous, or even slightly protandrous : automatic self-pollination can readily take place. (Cf. Fig. 113.) 247. Geum L. Flowers yellow; protogynous or rarely homogamous; with concealed nectar secreted in the receptacle. Sometimes androdioecious or andromonoecious. 848. G. rivale Z. (Herm. Miiller, ' Fertilisation,'p. 229 ; Kerner,' Nat. Hist. PI.,' Eng. Ed. I, II; Loew, ' Bliitenbiol. Floristik,' p. 390; Schulz, ' Beitrage,' I, pp. 33-4; Warnstorf, Verh. bot. Ver., Berlin, xxxviii, 1896; Knuth, ' Bloemenbiol. Bijdragen.') — In the flowers of this species the calyx is brownish-red, and the petals bright yellow streaked with red; nectar is secreted in numerous drops in the receptacle. According to Hermann Miiller, t
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