May 2015 Phenology

by Carl Strang

April’s phenological signal held true in May’s first flowering dates. This year continues to run ahead of most, but not by much.

Ohio buckeye was among the plants that bloomed in May.

Ohio buckeye was among the plants that bloomed in May.

Median first flower dates this May at Mayslake Forest Preserve were 7 days earlier than last year (54 species), 5 days earlier than in 2013 (70 species), 18 days later than in 2012 (69 species), 4 days earlier than in 2011 (68 species), 7 days later than in 2010 (45 species), and 3 days earlier than in 2009 (46 species).

Common spiderwort is peaking now, but started blooming in May.

Common spiderwort is peaking now, but started blooming in May.

The respective numbers for April were, in the same order: 6 days earlier, 9 days earlier, 25 days later, 6 days earlier, 9 days later, and 3 days earlier. On the whole this shows the usual trend of convergence among years as the season progresses.

A number of sedges first bloomed in May, including the small yellow fox sedge.

A number of sedges first bloomed in May, including the small yellow fox sedge.

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