Coefficient of Conservatism:
Coefficient of Wetness:
A. A. Reznicek
Fens, open cedar and tamarack swamps, shores and streamsides, usually in calcareous sites.
Frequently distinguished in manuals from S. lucida by shorter aments. Although this is a tendency, it is not sufficiently consistent to use as a key character. Mature pistillate aments of Michigan specimens of S. serissima range 2–5 cm long; those of S. lucida 1.5–5 cm long. Staminate aments are ca. 2.5–3.5 cm long in S. serissima and 1.5–6 cm in S. lucida.
The name autumn willow is espressive, as this species is unique in fruiting in summer and fall. It is an intriguing sight to see the catkins of this species shedding the last of their fluffy seeds in mid winter. In fall, one can occasionally see striking shrubs looking as if cotton balls had been strung on them.