. South African botany. Botany. 42 SOUTH AFRICAN BOTANY (b) The tuber (fig. 26) is a portion of a stem growing underground and swollen by the deposition of food material. It differs from a rhizome in that it is only a portion of a stem, instead of a continuous stem. A potato is a good example of a tuber. It bears modified leaf buds called " eyes ". These are inserted in a similar order to the leaves on the aerial part. Tubers form a valuable method of propagating plants, and this is the chief means of propagation in the case of the potato plant and Jerusalem Pig. 26.—Tube
. South African botany. Botany. 42 SOUTH AFRICAN BOTANY (b) The tuber (fig. 26) is a portion of a stem growing underground and swollen by the deposition of food material. It differs from a rhizome in that it is only a portion of a stem, instead of a continuous stem. A potato is a good example of a tuber. It bears modified leaf buds called " eyes ". These are inserted in a similar order to the leaves on the aerial part. Tubers form a valuable method of propagating plants, and this is the chief means of propagation in the case of the potato plant and Jerusalem Pig. 26.—Tubers of Potato. (c) The bulb (fig. 27) consists of a flattened disc-like portion of the stem, surrounded by the swollen bases of leaves. The outside is often protected by thin membranous leaves. There are two kinds of bulbs, tunicated bulbs (in which the outer leaves are large and completely ensheath the inner leaves), onion, and scaly bulbs, in which all leaves are about the same size and overlap each other, tulip. In the interior of the bulb in the axil of one of the fleshy leaves is a bud which grows in spring at the expense of the food stored. 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 Storey, Francis W; Wright, K. London, New York, Longmans, Green
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1922
