. Plant life [microform]. Botany; Botanique. laa^ HTOBY OF THE PLANTS. it has below it what seems at first sight to be a big green calyx of very nuinorous sepals. What 18 this deceptive object ? Weil, it is called an involucre, and it really acts to the compound flower-head very much as the calyx acts to the single blossom. The florets having got rid of their sepa- rate calyxes, the flower-head pro- vides itself with a cup of leaves (technically called bracts), which pro- tect the unopened head in its early stages, and serve to keep off ants or other creeping insects exactly as a calyx does fo
. Plant life [microform]. Botany; Botanique. laa^ HTOBY OF THE PLANTS. it has below it what seems at first sight to be a big green calyx of very nuinorous sepals. What 18 this deceptive object ? Weil, it is called an involucre, and it really acts to the compound flower-head very much as the calyx acts to the single blossom. The florets having got rid of their sepa- rate calyxes, the flower-head pro- vides itself with a cup of leaves (technically called bracts), which pro- tect the unopened head in its early stages, and serve to keep off ants or other creeping insects exactly as a calyx does for the single flower. Inside this invo- lucre, again, all the florets of the thistle are equal and similar. Each has a tiny calyx, hardly recognis- able as such, made up of feathery hairs which cap the inferior ovary. Within this fallacious calyx, once more, the floret has a purple corolla. no. 36.—PLOWEB - HEAD OP A THISTLE, CONSISTINQ OP VEBY NUMKROUS PURPLE PL0BET8, ALL EQUAL AND 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 Allen, Grant, 1848-1899. London : Hodder and Stoughton
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