Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

Leaf Temperatures of Heliotropium tenellum and Their Ecological Implications

Jerry M. Baskin and Carol C. Baskin
The American Midland Naturalist
Vol. 100, No. 2 (Oct., 1978), pp. 488-492
DOI: 10.2307/2424854
Stable URL: http://www.jstor.org/stable/2424854
Page Count: 5
  • Read Online (Free)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Leaf Temperatures of Heliotropium tenellum and Their Ecological Implications
Preview not available

Abstract

Heliotropium tenellum (Nutt.) Torr. is a characteristic summer annual plant species of the hot, dry cedar glade environment in southeastern United States and in Missouri. During periods of intense solar radiation, temperatures of its small (ca. 70 mm2) leaves remain near air temperature, fluctuating from 2.5 C above to 3.0 C below air temperature. The small leaves of H. tenellum, by maintaining temperatures near those of the air, may have a twofold physiological value to the plant. Temperatures near air temperatures would be better for enzyme-mediated reactions, and transpiration rates would be reduced.

Page Thumbnails

  • Thumbnail: Page 
488
    488
  • Thumbnail: Page 
489
    489
  • Thumbnail: Page 
490
    490
  • Thumbnail: Page 
491
    491
  • Thumbnail: Page 
492
    492