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H. CALYCINUM. Aaron's Beard, or Rose of Sharon. South-east Europe. This is a well-known native species of shrubby growth, bearing large yellow flowers from 3 inches to 4 inches in diameter. It is a prostrate plant, with coriaceous glossy leaves with small pellucid dots, and of great value for planting in the shade.
Adventitious buds may proceed from specialized cells, as on the margin of the leaves of Bryophyllum calycinum; or from the cells of special tissues, as in the epidermis of the begonias; or they may be provoked by wounds in nearly every part of the plant, provided it be able to heal the wound by swelling tissues or callus. The best instance is afforded by elms and by the horse-chestnut.
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