. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 466 ANGIOSPERMAE—MONOCOTYLEDONES. pendulous bells the style projects up to 2 mm. beyond the anthers. Pollen-collecting bees therefore first touch the stigma and then the anthers, so that cross-pollination is ensured by insect-visits. Should these fail, automatic self-pollination takes place by the fall of pollen upon the papillose edge of the stigma. Besides the usual form with bright yellow anthers and pure white perianth, Ludwig observed another in Thuring
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 466 ANGIOSPERMAE—MONOCOTYLEDONES. pendulous bells the style projects up to 2 mm. beyond the anthers. Pollen-collecting bees therefore first touch the stigma and then the anthers, so that cross-pollination is ensured by insect-visits. Should these fail, automatic self-pollination takes place by the fall of pollen upon the papillose edge of the stigma. Besides the usual form with bright yellow anthers and pure white perianth, Ludwig observed another in Thuringia with vivid yellow anthers and certain parts of the flower coloured red, such as the base of the perianth, hypogynous disk, or the base of the filaments. Lud- wig states that this large-flowered form secretes free nectar on the disk situated .) ;rXt;^'^'" "rsef^l'ri ^elow the ovary, so that it appears to be the side after removal of half the perianth with three of the entomophilous tO a greater degree than epipetalous stamens, a, anthers; /r, ovary; ii, stigma; ,. r> ^ ^ ^ j(', filaments. the Ordinary One. Schulz, however, says that this is not the case, as in both forms the flowers are of the same size, and the hypogynous disk is provided with sugary juice without secretion of free nectar. Visitors.—Knuth observed the honey-bee,, freq., po-ckg. Herm. Miiller records the honey-bee, and also (in the Alps) the Cerambycid beetle Acmaeops collaris L. 902. Polygonatum Adans. Homogamous humble-bee or bee flowers, white in colour, with a greenish tip. Nectar secreted, usually in large quantities, by the septal glands of the ovary, and stored at the base of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Knuth, Paul, 1854-1899; Knuth, Paul, 1854-1899; Mu?ller, Hermann,
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