. Elementary botany : theoretical and practical. A text-book designed primarily for students of science classes connected with the science and art department of the committee of council on education . Botany. spines and Tendrils 6i If all the normal buds of the plant were developed, the branching would follow regularly the arrangement of the leaves. This uniformity is often interfered with : ist, by the non- development of buds ; 2nd, by the formation of adventitious buds. Sometimes many of the buds remain entirely undeveloped. At other times, instead of being developed into leaf-bearing branc
. Elementary botany : theoretical and practical. A text-book designed primarily for students of science classes connected with the science and art department of the committee of council on education . Botany. spines and Tendrils 6i If all the normal buds of the plant were developed, the branching would follow regularly the arrangement of the leaves. This uniformity is often interfered with : ist, by the non- development of buds ; 2nd, by the formation of adventitious buds. Sometimes many of the buds remain entirely undeveloped. At other times, instead of being developed into leaf-bearing branches, they form subsidiary organs. 1. Spines are often modified branches. They are met with in the Sloe or Blackthorrl. At times they are small and desti- tute of leaves ; often they bear leaves, and under cultivation they become developed into leaf-bearing branches. Thus, whilst the Sloe is spiny, the cultivated Plum bears only leafy branches. There is a great difference between spines (as in the Sloe and Locust-tree) and prickles (as in the Rose and Bramble). In the former case the spines are modified branches, and as such are connected with the internal parts of the stem ; in the latter case the prickles are simply hairs of the epidermis which have become hardened by the deposition of secondary deposit. 2. Tendrils. — Sometimes the buds become developed as tendrils or cirrhi, as in the Grape Vine, enabling the plant to hold on to the object of support. Both spines and tendrils may be modifications of parts of leaves. The spines of the Barberry, and of some species of Acacia (fig. 129), and the tendrils of the Sweet Pea (fig. 93), are Fig. ^2.—Stem tendrils of the Grape-vine: 7/, in the normal state; v, bearing a bunch of 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 Edmonds, Henry
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1888
