. Flower ecology. Plant ecology; Fertilization of plants. 33 the same, I always expect to find less specialized insects on the crowded ; \_yhe relation between conspicuousness and pollination of flowers is noticeable in some flowers, as in Lysimachia vul- garis of which two forms occur, one in which the parts of the flower are larger and colored more intense; in this case self- pollination rarely occurs; but a form which grows in shaded places has smaller and less conspicuous flowers and these are seldom visited by insectaJuAn equally instructive lesson is afibrded by the small hea
. Flower ecology. Plant ecology; Fertilization of plants. 33 the same, I always expect to find less specialized insects on the crowded ; \_yhe relation between conspicuousness and pollination of flowers is noticeable in some flowers, as in Lysimachia vul- garis of which two forms occur, one in which the parts of the flower are larger and colored more intense; in this case self- pollination rarely occurs; but a form which grows in shaded places has smaller and less conspicuous flowers and these are seldom visited by insectaJuAn equally instructive lesson is afibrded by the small heart's ease {Viola tricolor). The. FIG. 18. Fig, 18. Nectaries. I. to tlie left, Hellebore iUellehorua viriMa). II. Colum- bine {A^wUegia vulgaris). III. Violet (Virila oAorata). I. and II. three times en- larged. I. to the right, Parnassus (Panias8ta palusCrte). s. nectary, d. portion where nectar is secreted; f. stamen, b petal. species has two varieties. The large flowered variety with conspicuous flowers, variety vulgaris, which has given rise to our pansy, is frequently visited by bumble-bees and other insects. In fact there is no occasion for self-pollination since insects carry pollen from one flower to another. The variety arvensis on the other hand is smaller and is a weed in gardens and fields. It is seldom visited by insects. Yet in both cases the spur of the lower petal contains the honey. Bhin- anthus crista galli variety major is abundantly visited by insects while the vartety minor is not. It follows from this that colors are important in pollination.^. 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 Pammel, Louis Herman, 1862-1931. [n. p. ] Press of J. B. Hungerford
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectfertili, bookyear1898
