. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. LINEAR i6i. Linum L. 215 544. L. catharticum L. (Heim. MuUei-, 'Fertilisation,' p. 147; MacLeod, Bot. Jaarb. Dodonaea, Ghent, vi, 1894, pp. 238-9; Warnstorf, Verb. bot. Ver., Berlin, xxxviii, 1896.)—The filaments of the small white homogamous flowers are fused at the base into a fleshy ring, which, as Herm. Miiller explains, secretes on its outer side five drops of nectar from five small, flat pits situated in the middle of the filaments. The five petals are
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. LINEAR i6i. Linum L. 215 544. L. catharticum L. (Heim. MuUei-, 'Fertilisation,' p. 147; MacLeod, Bot. Jaarb. Dodonaea, Ghent, vi, 1894, pp. 238-9; Warnstorf, Verb. bot. Ver., Berlin, xxxviii, 1896.)—The filaments of the small white homogamous flowers are fused at the base into a fleshy ring, which, as Herm. Miiller explains, secretes on its outer side five drops of nectar from five small, flat pits situated in the middle of the filaments. The five petals are inserted into the same ring, a little higher than the nectar-pits, and alternating with them. The lower halves of their edges are closely applied, but their bases suddenly narrow, so as to leave a small round aperture—giving access to the nectar—immediately above each nectar-pit. The anthers are at the same level as the stigmas, but are at first remote from Fig. 65. Linum catharticum^ L. (after Herm. MuUer). (i) Young flower, seen from above: the anthers are stil! remote from the stigmas. (2) The same seen obliquely from above. (3) Somewhat older flower seen from above : the anthers are applied to the stigmas (4) Flower after removal of the calyx to show the insertion of the petals and the position of the nectaries. (5) Stamens and stigmas in the act of automatic self-pollination. (6) SepaJ seen from the inner side, with a drop of nectar. a, anthers: a', the united filaments; j/, stigma; k, nectaries. so that insect visitors may effect either self- or cross-pollination. Failing such visitors, automatic self-pollination takes place, the stamens bending more and more inwards, and the flowers closing in the evening. Warnstorf describes the flowers as slightly protogynous, the stigmas maturing before the flower opens. The pollen-grains are large, golden-yellow, spherical or ellipsoidal, tuberculated, with a maximum length of 50 /x and breadth of 30-37 yu,. Visitors.
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