. 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. 24 THE BOOT, OB DESCENDING AXIS, 112. The fruit. After the flower has fulfilled its office, the do- ciduous parts fall away, and the remaining energies of the plant arc directed to the development of the pistils into the perfect fruit. Let U3 illustrate this doctrine by tracing out 113. A view op the organs op tue pjeont, for example, (r) The root with its numerous fibers and fabrillce (some fibers tuberous) continues the axis d
. 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. 24 THE BOOT, OB DESCENDING AXIS, 112. The fruit. After the flower has fulfilled its office, the do- ciduous parts fall away, and the remaining energies of the plant arc directed to the development of the pistils into the perfect fruit. Let U3 illustrate this doctrine by tracing out 113. A view op the organs op tue pjeont, for example, (r) The root with its numerous fibers and fabrillce (some fibers tuberous) continues the axis downward, and ($) the stern upward. The leaves (a) approaching the summit, gradually loso their characteristic divisions, and at length become simple bracts, (b) still undoubted loaves. Next by an easy gradation they appear as sepals (c, d, e,) in the calyx, the outer envelope of the flower, with stalk expanded and blade contracted. Then by a somewhat abrupt transition they pass into the delicate and highly colored petals of the corrlla (/ g.), still retaining the essential marks of the leaf. To tho corolla uext succeed those slender organs called stamens (in, n\ known to bo altered leaves from the fact of their being often converted into petals (i, h). Lastly the pistils (»,) destined to bear the seeds, two or more central organs green in color, are each the result of the infolding of a leaf, tho mid-vein and united edges being ye*, discernible. CHAPTER IV THE EOOT OR DESCENDING AXIS. 114. Definition. The root is the basis of the plant and the princi- pal organ of nutrition. It originates with the radiclo of the seed ; the tendency of its growth is downward, and it is generally immersed in the soil. 115. Diagnosis. Roots are distinguished from stems by their downward di- rection, by the presence of absorbing fibers, (fibrillee), and by the absence of color, pith, buds, leaves, and all other stem-appendages. 116. Office. The two important offices in vegetable life which tho roo
Size: 1227px × 2037px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectbotany, booksubjectplants, bookyear18
