Technical Publication Volume 15-16

Technical Publication Volume 15-16

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ...SALICACEAE Trees or shrubs with brittle twigs, alternate, simple leaves, aments of dioecious flowers, soft light wood, and bitter bark. The family includes but two genera, Salix comprising the willows and osiers, and Populus, the aspens and cottonwoods. Leaves alternate, deciduous, simple, stipulate (stipules often caducous). Floners dioecious, without perianth, borne solitary in the axils of scales in axillary aments which appear before the leaves in spring; staminate flowers consisting of 1-many stamens, inserted on a receptacle, subtended by a glandlike or cup-shaped disk; anthers 2-celled, longitudinally dehiscent; pistillate flowers consisting of a pistil with a 1-celled ovary surmounted by a short style and 2--4-lobed stigma; ovules numerous. Fruit a 1-celled, 2--4-valved, ovoid capsule bearing numerous, comose, minute, exalbuminous seeds. KEY TO THE GENERA Page 1. Scales of the ament entire; disk minute, glandular; buds with a single scale.... Salix 352 2. Scales of the ament laciniate; disk cup-shaped; buds with numerous scales.... Populus 313 THE WILLOWS. Genus SALIX (Tourn.) L. The genus Salix includes about one hundred and seventy moisture-loving species of trees and shrubs, widely scattered throughout the northern hemisphere, a few forms occurring south of the equator. They thrive along stream banks and on moist bottom lands, and invade alpine summits and subarctic regions a.s scraggly, dwarfed shrubs. Approximately seventy species occur in North America, twenty-one of which are recognized as trees. A number of European species have been introduced for ornament and have become widely naturalized in eastern United States. Hybrids between European and native species are common. Leaves alternate, simple, lanceolate to linear more

Product details

  • Paperback
  • 189 x 246 x 10mm | 336g
  • United States
  • English
  • black & white illustrations
  • 1236983122
  • 9781236983121