A Manual of Structural Botany; For the Use of Classes, Schools, & Private Students

A Manual of Structural Botany; For the Use of Classes, Schools, & Private Students

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1865 edition. Excerpt: ...generally characterized as a monstrosity. Flower-buds proceed from the axils of leaves. Such leaves are termed floral leaves, or bracts (bractea, Lat. a thin leaf). Sometimes these bracts are coloured, as in Bougainat others they remain green, as in the Lime. All intermediate leaves, of whatever size, form, or colour, intervening between the bract and the calyx, are called bractlets. A. single bract may become so enlarged and folded as to inclose many flowers, which are arranged on a spadix. Such form of bract is termed a spathe (spatha, Lat. fruit-branch of a palm). It is either membranaceous, foliaceous, or woody (Fig. 108). Ex. Arum. If several bracts are arranged in a whorl or verticel around the base of certain kinds of inflorescence, such as an umbel or capitulum, such a verticel of bracts is called an involucre. Ex. Fool's parsley. Small bracts which overlap, or imbricate, like the tiles of a house, are often termed scales. When the bracts of an involucre cohere and form a cup around the base of the fruit, as in the acorn, it is called a cupule (cupula, Lat. a little cup (Fig. 109). The manner in which the floral en-mg. 109. vdopes, i. e., the calyx and corolla, are arranged in the bud, is termed (estivation (cestivus, Lat. belonging to summer). This arrangement often differs from that of leafbuds considerably, and is commonly of one of the following kinds: --Valvate. This is the same as valvate vernation in leaf-/ buds (Fig. 110). V / Induplicate. When the mar-w gins are folded inwards m9-no(Fig. 111). Contorted, or Twisted. When twisted in the bud (Kg. 112). Imbricate. When overlapping, as in the tiles of a house (Fig. 113). Quincuncial (quincunx, Lat. arranged as five in cards). Five sepals or petals, arranged in a spiral; so that two...show more

Product details

  • Paperback | 30 pages
  • 189 x 246 x 2mm | 73g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236560507
  • 9781236560506