. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. POLYGON ACE AE 341 766. Polygonum L. Literature.—Herm. Miiller, ' Fertilisation,' p. 516 ; Knuth, ' Bl. u. Insekt. a. d. nordfr. Ins.,' pp. 127-8; Meehan, Proc. Acad. Nat. Sci., Philadelphia (Pa.), (1889) 1890. Flowers mostly homogamous or protandrous, belonging to classes Po, EC, and C. Perianth generally petaloid, and flowers frequently aggregated into conspicuous inflorescences. Nectar either secreted in the base of the flower or absent. Some- times dimor
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. POLYGON ACE AE 341 766. Polygonum L. Literature.—Herm. Miiller, ' Fertilisation,' p. 516 ; Knuth, ' Bl. u. Insekt. a. d. nordfr. Ins.,' pp. 127-8; Meehan, Proc. Acad. Nat. Sci., Philadelphia (Pa.), (1889) 1890. Flowers mostly homogamous or protandrous, belonging to classes Po, EC, and C. Perianth generally petaloid, and flowers frequently aggregated into conspicuous inflorescences. Nectar either secreted in the base of the flower or absent. Some- times dimorphism. Gynodioecism or gynomonoecism frequent. Meehan says that numerous species, P. Persicaria L., P. aviculare Z., and P. Hydropiper L., bear cleistogamous flowers. Hermann Miiller states that ' The species of Polygonum, like those of Geranium, show clearly how with conspicuousness and abundance of honey the number and variety of visitors increase, and how, as the likelihood of cross-fertiliza- lion is thus increased, the possibility of self-fertilization becomes less important; the converse is also clear. But they show at the same time that the abundance of a plant is in no way determined alone by the certainty of cross-fertilization ' (op. cit., p. 516). 2469. P. Fagopyrum L. (= Fagopyrum esculentum MoencK). (Hildebrand, ' D. Geschlechts-Vert. b. d. Pfl.,' p. 40; Jordan, K. F., Ber. D. bot. Ges., Berlin, v,. Fig. 350. PolygortuTn Fagopyrum^ L. (after Herm. Miiller). (r) Long-styled, and (2) short-styled flower, after removal of two perianth leaves. a, anthers; M, nectary; st^ stigmas. 1887; Herm. Miiller, 'Fertilisation,' pp. 509, 516; Knuth, 'Bl. u. Insekt. a. d. nordfr. Ins.,' pp. 129, 166-7; Kirchner, 'Flora v. Stuttgart,' p. 213; Schulz, ' Beitrage,' II.)—The flowers of this species are dimorphous, with exposed to half- concealed nectar. They are white or reddish in colour, and crowded together so as to be highly conspicuous; in consequence of this, their honey
Size: 2861px × 873px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisheroxfor, bookyear1906
