. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 20 ANGIOSPERMAE—DICOTYLEDONES 46. R. sulphiireus Sol.—According to Ekstam, the diameter of the flowers is 16 mm.; in Arctic Siberia (Kjellman) and on Nova Zemlia it is distinctly greater. In Spitzbergen this observer (op. cit., p. 23) found the flowers to be protogynous- homogamous, and faintly fragrant. In expanded blossoms the gynoecium projects so far beyond the stamens that autogamy is prevented. Andersson and Hesselman (op. cit., p. 49) state that this
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 20 ANGIOSPERMAE—DICOTYLEDONES 46. R. sulphiireus Sol.—According to Ekstam, the diameter of the flowers is 16 mm.; in Arctic Siberia (Kjellman) and on Nova Zemlia it is distinctly greater. In Spitzbergen this observer (op. cit., p. 23) found the flowers to be protogynous- homogamous, and faintly fragrant. In expanded blossoms the gynoecium projects so far beyond the stamens that autogamy is prevented. Andersson and Hesselman (op. cit., p. 49) state that this species flowers in Spitzbergen from the end of June until August, the fruits being ripe at the end of the latter month—or much earlier near the deep fjords. Visitors.—Ekstam observed seven distinct cases in Spitzbergen where the flowers were visited by numerous Diptera, and he also noticed these insects elsewhere. 47. R. pyrenaeus L. (Ricca, ' Oss. suUa fecondaz. incroc. d. veget. alp, e subalp.,' p. 3; Herm. Miiller, 'Alpenblumen,' pp. 132-3 ; MacLeod, ' Pyreneenbl.,' p. 114.)—In this species the nectaries are also very variable, as the accompanying figure shows (Fig. 6). According to Ricca, cross-pollination is at first favoured by feebly. Fig. 6, Rannnctthis pynnaeuSy L. (after Herm. Miiller). 1-12. Various forms of nectary. h, nectar. 13. Transition from petal to stamen. marked protogyny. Subsequently—according to Miiller—cross- and self-pollination are equally possible as the result of insect-visits. During this stage, automatic self- pollination by means of the inner stamens can easily take place. Visitors.—Hermann Miiller observed—in the Alps—2 beetles, 9 flies, one Ichneumon, and one micro-Lepidopterid. MacLeod observed—in the Pyrenees— 2 flies. 48. R. alpestris L. (including R. Traunfellneri Hoppi). (Herm. MuUer, 'Alpenblumen,' pp. 130-1; Kerner, 'Nat. Hist. PI.,' Eng. Ed. i, II.) — According to Miiller, cross-pollination is at first favoured
Size: 2052px × 1217px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisheroxfor, bookyear1906
