. Gray's school and field book of botany. Consisting of "Lessons in botany," and "Field, forest, and garden botany," bound in one volume. Botany; Botany. 46 STEMS. [SECTION That of Indian Turnip is formed one year and is consumed the next. Fig. 104 represents it in early summer, having below the corm of last year, from which the roots have fallen. It is partly consumed by the growth of the stem for the season, and the corm of the year is forming at base of the stem above the line of roots. 112. The corm of Crocus (Fig. 105, 106), like that of its relative Gladiolus, is
. Gray's school and field book of botany. Consisting of "Lessons in botany," and "Field, forest, and garden botany," bound in one volume. Botany; Botany. 46 STEMS. [SECTION That of Indian Turnip is formed one year and is consumed the next. Fig. 104 represents it in early summer, having below the corm of last year, from which the roots have fallen. It is partly consumed by the growth of the stem for the season, and the corm of the year is forming at base of the stem above the line of roots. 112. The corm of Crocus (Fig. 105, 106), like that of its relative Gladiolus, is also reproduced annually, the new ones forming upon the summit aud sides of the old. Such a corm is like a tuber in bud- ding from the sides, i. e. from the axils of leaves ; but these leaves, instead of being small scales, are the sheathing bases of fo- liage-leaves which covered the surface. It resem- bles a true bulb in having these sheaths or broad scales; but in the corm or solid bulb, this soHd part or stem makes up the principal bulk. 113. The Bulb, strictly so-called, is a stem like a reduced corm as to its solid part (or plate); while the main body consists of thickened scales, which are leaves or leaf-bases. These are like bud- scales ; so that in fact a bulb is a bud with fleshy scales on an exceedingly short stem. Compare a White Lily bulb (Fig. 107) with the strong scaly buds of the Hickory and Horse-chestnut (Fig. 72 and 73), and the resemblance will appear. In corms, as in tubers and rootstocks, the store of food for future growth is deposited in the stem; while in the bulb, the greater part is deposited in the bases of the leaves, changing them into tliiclf scales, which closely overlap or enclose one another. ] 14. A Scaly Bulb (like that of the Lily, Fig. 107,108) is one in whicli the scales are thick but comparatively narrow. 115. A Tunicated or Coated Bulb is one in which the scales enwrap each other, forming concentric coats or layers, as in Hyacinth and On
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1887
