. Class-book of botany: being outlines of the structure, physiology and classification of plants; with a flora of the United States and Canada. Botany; Plants; Plants. THE STEM, OR ASCENDING AXIS. 39 leaves and flowers to perish in autumn—a new bud to open the following spring— and a new internode with its roots to abide several years. The number of joints in- dicates, not the age of the plant, but the destined age of each internode. Thus if there are three joints, we infer that they arc triennial, perishing after the third sea- son, while the plant still grows on. 185. The premorse root-stock
. Class-book of botany: being outlines of the structure, physiology and classification of plants; with a flora of the United States and Canada. Botany; Plants; Plants. THE STEM, OR ASCENDING AXIS. 39 leaves and flowers to perish in autumn—a new bud to open the following spring— and a new internode with its roots to abide several years. The number of joints in- dicates, not the age of the plant, but the destined age of each internode. Thus if there are three joints, we infer that they arc triennial, perishing after the third sea- son, while the plant still grows on. 185. The premorse root-stock, formerly described as a root, is a short, erect rhizome, ending abruptly below as if bitten square off (prsemorsus). This is owing to the death of the earlier and lower in-, ternodes in succession, as in the horizontal rhizome. Scabious, Viola pedata, benjamin-root (Trillium) are examples. 186. Crown op the root designates a short stem with condensed internodes, remaining upon some perennial roots, at or beneath the sur- face soil after the leaves and annual stems have perished. 187. The tuber is an annual thickened portion of a subterranean stem or branch, provided with latent buds called eyes, from which new plants ensue the succeeding year. It is the fact of its origin with the ascending axis, and the production of buds that places the tuber among stems instead of roots. The potato and artichoke are examples. 56 53 54. Tubers as they prow. 54, The common potato (Salanum). 55, Artichoke (Ilelianthus) 56, Sweet potato (Convolvulus). 188. How the potato grows. The stem of the potato plant sends out roots from its base, and branches above, like other plants; but we observe that its branches have two distinct modes of development. Those branches which arise into the air, whether issuing from the above-ground or the under-ground portion of the stern, expand regularly into leaves, &c, while those lower branches which continue to grope in the dark, damp ground, cease at le
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