Coefficient of Conservatism:
Coefficient of Wetness:
A shrub to large tree, along rivers, streams, and lakes, and in other moist places.
The very fine reticulation of veinlets visible on the undersides of the leaves is similar to that in S. amygdaloides, which differs in having the leaves glaucous beneath and normally somewhat broader as well as estipulate. The narrow leaves, many curved (slightly sickle-shaped) are distinctive, giving a fine texture to plants of this species.
The hybrid of the two species, S. ×glatfelteri C. K. Schneid., is known from Michigan and should be expected where the two are found together. Dried specimens of S. nigra could be confused superficially with S. petiolaris if the strongly glaucous lower surface of the leaves in the latter were thought to have been lost in drying. However, S. petiolaris lacks stipules, while young shoots of S. nigra are generally stipulate. See also comments under S. eriocephala. The common name “Black Willow” is often loosely applied to the large introduced trees, S. euxina and S. ×fragilis (S. alba × S. euxina), which have the leaves whitened beneath and petiolar glands. Often, the introduced trees have multiple diverging trunks rather than single, upright trunks as is often the case in the native tree willows.