Torreya Volume 18-22

Torreya Volume 18-22

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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. 1918 edition. Excerpt: ...the vast majority of species, in the neighborhood of a boundary which coincides more or less roughly with that of southern British Columbia. What may be termed the Alaskan or sub-arctic flora in like manner seems to have reached the limits within which it may be called dominant somewhere north of the 49th parallel: and although many of its members continue southward in the Rockies, this region lies too far eastward of the eastern boundary of Washington to have much influence on the flora of that state. The exact limits of Henry's manual are not very clearly defined to the northward. In his own words. "The region covered is mainly the southern part of the province extending from Vancouver Island to the Rockies, with a rather indefinite northern limit, to about the Skeena." Since the valley of the Skeena, with its embouchure at Prince Rupert in latitude 54, does not cross the entire breadth of the Province, but is replaced on the eastern slope by the, valley of the Peace and its tributaries, it becomes somewhat difficult to fix an exact northern limit. But in any case the territory covered by this manual cannot be less than twice as large as the State of Washington, and extends far enough to the east to take in the entire western slope of the Rocky Mountain region, which lies far to the eastward of any part of the State of Washington, so that the casual observer would not unreasonably assume that of the two Floras, Henry's would surpass Piper's in the total number of species. But over against this hasty generalization must be set the fact, not only of the steady increase of species from the poles toward the equator, but the further consideration that the Upper Sonoran Zone, which dominates the semi-arid portion of eastern...show more

Product details

  • Paperback | 288 pages
  • 189 x 246 x 15mm | 517g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236937821
  • 9781236937827