Diana B. Stein, David S. Barrington, Recurring Hybrid Formation in a Population of Polystichum x potteri: Evidence from Chloroplast DNA Comparisons, Annals of the Missouri Botanical Garden, Vol. 77, No. 2 (1990), pp. 334-339
No takes yet. Share an insight, caveat, or question.
Stein et al. (1990) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: