Patrick B. Shafroth, Michael L. Scott, Jonathan M. Friedman, Richard D. Laven, Establishment, Sex Structure and Breeding System of an Exotic Riparian Willow, Salix X rubens, The American Midland Naturalist, Vol. 132, No. 1 (Jul., 1994), pp. 159-172
No takes yet. Share an insight, caveat, or question.
Shafroth et al. (1994) studied this question.
Synapse has enriched 4 closely related papers on similar clinical questions. Consider them for comparative context: