July Flowering Phenology

by Carl Strang

July was the last month in which I collected phenology data from Mayslake Forest Preserve. The results provided a satisfactory conclusion.

Many of Mayslake’s prairie plants first open their flowers in July.

Many of Mayslake’s prairie plants first open their flowers in July.

First flower dates become less different among years as the summer progresses, and that was true this year as well. The median difference from 2014 was 0 days for 47 species, an insignificant 2 days earlier than in 2013 for 31 species and the same vs. 2011 for 37 species, 1 day later than in 2010 for 37 species, and a slightly larger 5 days earlier for 35 species in comparison to 2009. The odd early year of 2012 continued to be the outlier, but even that difference was down to 10.5 days for 38 species.

Michigan lily provides one of the preserve’s more extravagant floral displays.

Michigan lily provides one of the preserve’s more extravagant floral displays.

All those medians were smaller than those for June, except the one for 2013, which was the same.

 

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