. A text-book of botany for secondary schools. Botany. T2 A TEXT-BOOK OP BOTANY and work of roots. One of the most obvious contrasts with the stem in external appearance is that roots bear no leaves or scales, and are not made up of nodes and inter- nodes. The root that comes from the seed, including all of its subsequent branches, is the primary root. In some cases the primary root develops a single prominent vertically- descending axis, called the tap-root, which gives off small branches, as in the dandelion (Fig. 68, ^4); in other cases the primary root breaks up at once into a cluster of b
. A text-book of botany for secondary schools. Botany. T2 A TEXT-BOOK OP BOTANY and work of roots. One of the most obvious contrasts with the stem in external appearance is that roots bear no leaves or scales, and are not made up of nodes and inter- nodes. The root that comes from the seed, including all of its subsequent branches, is the primary root. In some cases the primary root develops a single prominent vertically- descending axis, called the tap-root, which gives off small branches, as in the dandelion (Fig. 68, ^4); in other cases the primary root breaks up at once into a cluster of branches, as in many grasses (Fig. 68, B). In many cases the tap- root becomes conspicuously thickened for food storage, as illustrated by such common vegetables as radish (Fig. 69, A), turnip, and parsnip. In some cases where there is no. Fig. 69.—Fleshy roots; A, radish with fleshy tap-root; B, dahlia with cluster of fleshy roots tap-root, the branches become thickened, forming such clusters of thickened roots as those of the dahlia (Fig. 69, B) and of the sweet potato. Roots that from the stem or the leaA'es are secondari/ roots. For example, a subterranean stem or a creeping stem strikes root from the. 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 Coulter, John Merle, 1851-1928. New York, D. Appleton
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1906
