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Observations by Gary Fewless for Green Bay WI (Lat.N 44.51° Long. W 88.02° ), except as noted. For flowers lacking conspicuous petals or sepals I define "anthesis" as release of pollen by mature anthers.

August 2006

Aug 28 Rhus typhina (staghorn sumac) leaves are still green (see Aug 16 and Sep 6 photos of the same plant).
Aug 16 Rhus hirta (staghorn sumac) leaves are still healthy and green, UWGB. I'll post a photo of the same plants over the next few weeks as the leaf color change begins.
Aug 10 Helianthus giganteus (giant sunflower) well into flower, Marinette County.
Aug 09 First day of flower for Solidago rigida (stiff goldenrod), UWGB. This site is usually a little later than the Baird Creek area.
Aug 07 Ambrosia artemisiifolia (common ragweed) is now in flower in northeastern Wisconsin. It is the most important source of pollen for late summer hayfever. It is not uncommon to hear someone remark that they have a "summer cold" during this season, when in fact they are more likely to be experiencing an alergic reaction to the pollen of ragweed. The showy goldenrods (especially Solidago canadensis, Canada goldenrod) are often blamed for hayfever, but they are simply conspicuous during the time that the inconspicuous ragweed is releasing its pollen.
Aug 02 First day of fully open flowers for Solidago canadensis (Canada goldenrod)
Aug 01

First day of flower for Euthamia graminifolia (grass-leaved goldenrod) on UWGB.

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Last updated on May 20, 2015