Smithiana and S
stipularis are supposed to be hybrids between this species and S. Caprea or, in the latter, S. cinerea. Both closely resemble S. viminalis.
S. viridis (green). fl., catkins on short, leafy, lateral branches, spreading or recurved, cylindrical, dense in flower, lax in fruit. May and June. l. narrowly lanceolate-elliptic, attenuated at base and long-acuminate at apex, or equally attenuated at each end, glandular-serrated, glabrous on both sides when mature; young ones silky. Young branches downy. h. 30ft. Europe (Britain). (Sy. En. B. 1808.) SYN. S. Russelliana.