. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. ^58 A NGIOSPERMAE—DICO TYLEDONES Sprengel, humble-bees. Knuth, 3 humble-bees, all skg.— i. Bombus agrorum i^. §; 2. E. lapidarius Z. 5; 3- B. terrester L. J. Herm. Miiller, the small bee Halictus cylindricus F. 5, po-dvg. Scott-Elliot (Dumfriesshire), a humble-bee ('Flora of Dumfriesshire,' p. 124). 2036. H. albus L. (Knuth, ' Bliitenbiol. Beob. a. d. Ins. Capri,' p. 11; Comes, ' Ult. stud.')—In this species the yellowish-white corolla projects for 2 cm. fro

. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. ^58 A NGIOSPERMAE—DICO TYLEDONES Sprengel, humble-bees. Knuth, 3 humble-bees, all skg.— i. Bombus agrorum i^. §; 2. E. lapidarius Z. 5; 3- B. terrester L. J. Herm. Miiller, the small bee Halictus cylindricus F. 5, po-dvg. Scott-Elliot (Dumfriesshire), a humble-bee ('Flora of Dumfriesshire,' p. 124). 2036. H. albus L. (Knuth, ' Bliitenbiol. Beob. a. d. Ins. Capri,' p. 11; Comes, ' Ult. stud.')—In this species the yellowish-white corolla projects for 2 cm. fro Stock Photo
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. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. ^58 A NGIOSPERMAE—DICO TYLEDONES Sprengel, humble-bees. Knuth, 3 humble-bees, all skg.— i. Bombus agrorum i^. §; 2. E. lapidarius Z. 5; 3- B. terrester L. J. Herm. Miiller, the small bee Halictus cylindricus F. 5, po-dvg. Scott-Elliot (Dumfriesshire), a humble-bee ('Flora of Dumfriesshire, ' p. 124). 2036. H. albus L. (Knuth, ' Bliitenbiol. Beob. a. d. Ins. Capri, ' p. 11; Comes, ' Ult. stud.')—In this species the yellowish-white corolla projects for 2 cm. from the villous sticky calyx, which is 1-5 cm. long. The stigma is receptive when the flower opens, at which time the anthers of uppermost five stamens dehisce and pollinate it. The remaining stamens develop successively, and in doing so approximate themselves to the stigma. Automatic self-pollination is therefore inevitable, and Comes states that it is effective. 634. Petunia Juss. 2037. P- violacea Lindl.—Darwin describes this species as self-sterile. 2038. P. nyctaginifolia Juss. (Comes, ' Ult. stud.')—Comes states that this species is infertile if insect-visits fail. 635. Nicotiana L. Protogynous or homogamous flowers belonging to class C or L: with nectar secreted by the base of the ovary, and stored in the corolla-tube. 2039. N. Tabacum L. (Kirchner, 'Flora v. Stuttgart, ' pp. 572-3; Knuth, pecies the corolla is 50-70 mm. long: its upper part is bell - shaped, ' Bloemenbiol. Bijdragen.')—In thi A. with a throat 10 mm. in dia- meter, and rose-coloured with a darker middle line on each of the expanded lobes. The corolla-tube is about 30 mm. long and 5 mm. broad. A considerable part of it is filled with the abundant nectar. The lower parts of the filaments are fused with the corolla-tube, and these parts are covered with soft hairs. When the flower opens the stigma is mature, while the anthers either dehisce simul- taneously, or later, according to the variet}'. Th

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