Coefficient of Conservatism:
Coefficient of Wetness:
BAY-LEAVED WILLOW, LAUREL WILLOW
A European species, occasionally escaped from cultivation and apparently established in fields and on dunes, streamsides, borders of forests, and other places. First collected in 1916 in Marquette Co. Trees 10–12 m tall, much larger than usually found, are well established in Gogebic Co. along the Middle Branch of the Ontonagon River northeast of Watersmeet (W. W. Brodowicz 261, MICH).
Sometimes difficult to distinguish from S. serissima and S. lucida (see full descriptions in the key), but with leaves typically paler beneath than in S. lucida and not long-acuminate, but not so glaucous as in S. serissima. The measurements in the key for mature capsules are based on cultivated and escaped Michigan plants; some European specimens have capsules as long as 8 mm and granular-roughened, as in S. serissima.
Zinovjev (2011) suggests that collections from North America of Salix pentandra escaped into the wild are primarily the easily propagated hybrid of S. pentandra with S. euxina: S. ×meyeriana Willd., not S. pentandra itself.