The different forms of flowers on plants of the same species / by Charles Darwin.

  • Darwin Charles, 1809-1882.
Date:
1877
Catalogue details

Licence: Public Domain Mark

Credit: The different forms of flowers on plants of the same species / by Charles Darwin. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    CHAPTER III. Hetekostyled Dimobphic Plants—continued. Linum grandiflorum, long-styled form utterly sterile with own-form pollen—Linnm perenne, torsion of the pistils in the long-styled form alone—Homostyled species of Linum—Pnlmonaria offici- nalis, singular difference in self-fertility between the English and German long-styled plants—Pnlmonaria angustifolia shown to he a distinct species, long-styled form completely self-sterile— Polygonum fagopyrum—Various other heterostyled genera— Kubiacese—Mitchella repens, fertility of the flowers in pairs— Houstonia—Faramea, remarkable difference in the pollen-grains of the two forms; torsion of the stamens in the short-styled form alone; development not as yet perfect—The heterostyled structure in the several Rubiaceous genera not due to descent in common Page 81-136 CHAPTER IV. Heterostyled Teimoephic Plants. Lythrum salicaria—Description of the three forms—Their power and complex manner of fertilising one another—Eighteen different unions possible—Mid-styled form eminently feminine in nature —Lythrum Grjefferi likewise trimorphic—L. thymifolia dimor- phic—L. hyssopifolia homostyled—Nesa3a verticillata trimorphic —Lagerstroemia, nature doubtful—Oxalis, trimorphic species of —0. Valdiviana—0. Eegnelli, the illegitimate unions quite barren—0. speciosa—0. sensitiva—Homostyled species of Oxalis —Pontederia, the one monocotyledonous genus known to include heterostyled species 137-187 CHAPTER V. Illegitimate Ofespeing of Heterostyled Plants. Illegitimate offspring from all three forms of Lythrum salicaria— Their dwarfed stature and sterility, some utterly barren, some
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