Two glade goldenrods

Solidago ridiga (stiff goldenrod) is now in full bloom at Victoria Glades Conservation Area in Jefferson. Co., and I took the chance to photograph it alongside its more common congener, Solidago nemoralis (old field goldenrod), to show the differences between the two species. Solidago ridiga has a flat-topped or shallowly rounded inflorescence (versus pyramidal for the latter), relatively larger individual flowers, and upper leaves wider at the base and often clasping the stem. It occurs throughout the central region of the continental U.S. and just began blooming in these glades (versus mid-August for S. nemoralis).

Solidago ridiga (stiff goldenrod) inflorescence.
Solidago nemoralis (old field goldenrod) inflorescence.
Solidago ridiga (stiff goldenrod) florets.
Solidago nemoralis (old field goldenrod) florets.
Solidago ridiga (stiff goldenrod) leaves.
Solidago nemoralis (old field goldenrod) leaves.
Black-and-yellow lichen moth (Lycomorpha pholus) on inflorescence of old field goldenrod (Solidago nemoralis).
Black-and-yellow lichen moth (Lycomorpha pholus) on inflorescence of old field goldenrod (Solidago nemoralis).

©️ Ted C. MacRae 2021

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