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Ragweed
Family, Genus species: Asteraceae, Ambrosia artemisifolia
| Size | 19 - 22 um | |
| Shape | oblate to suboblate | |
| Exine | 1.5 - 1.8 um thick | |
| Intine | relatively thin | |
| Pores/furrows | tricolporate, furrows very short | |
| Sculpting | echinate | |
| Bloom Period | July to September | |
| Allergenicity | highly allergenic, main cause of allergies in late summer |
Thumbnails:
Ambrosia trifida (Giant Ragweed) taken by Brian Hoffman
Dr. M. Davis images:
Ragweed
References:
Bassett, John, Clifford Crompton and John Parmelee. An Atlas of Airborne Pollen Grains and Common Fungus Spores of Canada. Canada Department of Agriculture, 1978.
Jelks, Mary, M.D. Allergy Plants that Cause Sneezing and Wheezing. World Wide Printing, Tampa, 1986.
Kapp, Ronald O. Pollen and Spores, Second Edition. The American Association of Stratigraphic Palynologists Foundation, 2000.
Lewis, Walter H., Prathibha Vinay and Vincent E. Zenger. Airborne and Allergenic Pollen of North America. The Johns Hopkins University Press, Baltimore and London, 1983.
page created by: Brian Hoffman