. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. ELA TINEAE—HYPERICINEAE 203 XVIII. ORDER ELATINEAE CAMB. There is only one plant included in this order, of which the flowers have been studied as regards pollination. 145. Elatine L. 507. Elatine hexandra DC.—Vaucher says that automatic self-pollination takes place in the small reddish-white flowers of this species, the anthers dehiscing introrsely, and shedding pollen directly upon the three stigmas. XIX. ORDER HYPERICINEAE DC. This order is represented by
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. ELA TINEAE—HYPERICINEAE 203 XVIII. ORDER ELATINEAE CAMB. There is only one plant included in this order, of which the flowers have been studied as regards pollination. 145. Elatine L. 507. Elatine hexandra DC.—Vaucher says that automatic self-pollination takes place in the small reddish-white flowers of this species, the anthers dehiscing introrsely, and shedding pollen directly upon the three stigmas. XIX. ORDER HYPERICINEAE DC. This order is represented by the genus 146. H5T)ericum L. The flowers are rendered conspicuous not only by the usually large, bright yellow corolla, but also by the similarly coloured branched stamens (described as 'bundles'), and the three styles. They are homogamous pollen flowers. The glands on the calyx in many species keep away creeping insects. The flower mechanisms of the various species agree as regards size, number of stamens and possibility of automatic self-pollination, with those of— 508. H. perforatum L. (Herm. Miiller, 'Fertilisation,' pp. 139-40; Kirchner, ' Weit. Beob.,' II, pp. 211-12; Kirchner, 'Flora v. Stuttgart,' p. 325 ; Knuth, 'Bl. u. Insekt. a. d. nordfr. Ins.,' pp. 49,152,' Weit. Beob. ii. Bl. u. Insekt. a. d. nordfr. Ins.,' p. 232, ' Bliiten- biol. Beob. a. d. Ins. Riigen,' ' Bloemenbiol. Bijdragen.') — In the flowers of this species the three spreading styles are situated between the three bundles of filaments. The anthers dehisce upwards—the innermost first—and do not usually touch the stigmas, which are on the same level, so that cross- and self-pollination alike depend upon insect-visits. When anthesis is over, the petals and stamens are drawn inwards, the stig- mas being thus generally brought into contact with the anthers, which are still covered with pollen, so that automatic self-pollination takes place if insect-visits have failed. Visitors. — Hermann Miill
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