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Suid-Afrikaanse Tydskrif Vir Wetenskap (Volume 86, Nos. 7-10)

Suid-Afrikaanse Tydskrif Vir Wetenskap (Volume 86, Nos. 7-10)


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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. 1904. Excerpt: ... 19.--ALIEN PLANTS SPONTANEOUS IN THE TRANSVAAL. By Joseph Burtt Davy, F.L.S., F.R.G.S. SUMMARY. Definition of the term, " Spontaneous Alien PIant." Classified and Annotated List of Species. Numerical distribution among genera and families. Relative Abundance of the Different Species. Colonists. Adventives. Common Species. Abundant Species. Economic Aspect of the Subject. Noxious Weeds. Troublesome Weeds. Innocuous Weeds. Useful Weeds and Other Aliens. Geographical Distribution. Factors Governing PIant Migration. The Origin of our Aliens. Routes of Travel. How PIants may Migrate. DEFINITION. The phrase "alien plants spontaneous in the Transvaal" refers to all non-indigenous plants growing in the Transvaal which are known, or believed, to have made their first appearance in the country within historic times, and which grow spontaneously, that is, without having been artificially planted or cultivated. It has been found necessary to a clear presentation of the subject, to include a few species which are native to South Africa, but which are either adventive on the High Veldt of the Transvaal, or are spreading as weeds on roadsides, vacant -rven, or cultivated lands, and are thus becoming weeds. Most, but not all, of the troublesome weeds of farm and garden, e.g., Burr-weed and Black-jack, are aliens. But not all aliens become weeds; for instance. Cosmos, the African Marigold and the Evening Primrose, are aliens, and have become naturalised, being spontaneous in several places in the Transvaal, but they are not weeds. What, then, are weeds? Bailey's English Dictionary (17th Edition, I7o7) defines a weed as "any rank or wild herb that grows of itself." Our ideas of weeds have, however, become specialised, and more definite, with increased knowledge of Bot...


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Product Details
  • ISBN-13: 9781150810374
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Edition: Annotated edition
  • Language: English
  • Returnable: N
  • Weight: 435 gr
  • ISBN-10: 1150810378
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Height: 246 mm
  • No of Pages: 240
  • Spine Width: 13 mm
  • Width: 189 mm


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Suid-Afrikaanse Tydskrif Vir Wetenskap (Volume 86, Nos. 7-10)
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