A contribution to our knowledge of seedlings / by the Right Hon. Sir John Lubbock.

  • John Lubbock, 1st Baron Avebury
Date:
1896
Catalogue details

Licence: Public Domain Mark

Credit: A contribution to our knowledge of seedlings / by the Right Hon. Sir John Lubbock. Source: Wellcome Collection.

    17/308
    A CONTRIBUTION TO OUR KNOWLEDGE OF SEEDLINGS Forms of Leaves. I have elsewhere1 called attention to the forms of leaves, and discussed the causes to which we may ascribe the endless differences which they present. Vertical leaves, for instance, are generally long and narrow, horizontal ones have a tendency towards width, which brings the centre of gravity nearer to the point of sup- port. Wide leaves, again, are sometimes heart-shaped, sometimes palmate. The former shape is obviously that' which would arise if a linear leaf were gradually widened at the base; and L have pointed out that in many species with palmate leaves—for instance, species of Passiflora, Cephalandra, Hibiscus, &c.—the first, or few first, leaves are entire and more or less cordate. 1 Flowers, Fruits, and Leaves (Nature Series), Macmillan & Co. See also various papers in the Journal of the Linnean Society. 15
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