. Flowers, fruits and leaves. Botany; Flowers; Seeds; Leaves. 142 CEPHALANDRA. [chap. Now we shall have no difficulty in finding cases where, while in mature plants the leaves are more or less lobed and palmate, the first leaves succeeding the cotyledons are entire. This would seem to point to the fact that when in any genus we find heart-shaped and lobed leaves, the former may represent the earlier or ancestral condition. In support of this it will be sufficient here to give three instances belonging to three distinct families— namely, Cephalandra palmata (Fig. 92), one of the. Fig. 92.—Cepha
. Flowers, fruits and leaves. Botany; Flowers; Seeds; Leaves. 142 CEPHALANDRA. [chap. Now we shall have no difficulty in finding cases where, while in mature plants the leaves are more or less lobed and palmate, the first leaves succeeding the cotyledons are entire. This would seem to point to the fact that when in any genus we find heart-shaped and lobed leaves, the former may represent the earlier or ancestral condition. In support of this it will be sufficient here to give three instances belonging to three distinct families— namely, Cephalandra palmata (Fig. 92), one of the. Fig. 92.—Cephalandra palmata. Seedling. Cucurbitaceae; Hibiscuspedunculatus (Fig. 93), belong- ing to the Malvaceae; and, one of the most striking of all, Passiflora ccerulea (Fig. 94). Other species of Passiflora show the same passage from entire to trifid leaves, while on the contrary in P. van Volscenii even the leaves just following the cotyledons are more or less divided. The advantage of the palmate form may perhaps consist in its bringing the centre of gravity nearer to the point of support. Broad leaves, moreover, are of two types : cordate,. 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 Lubbock, John, Sir, 1834-1913. London : Macmillan
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Keywords: ., bookcentury1800, bookdecad, booksubjectbotany, booksubjectflowers
