Robert E. Woodson, Jr., Studies in the Apocynaceae. VIII. An Interim Revision of the Genus Aspidosperma Mart. & Zucc., Annals of the Missouri Botanical Garden, Vol. 38, No. 2 (May, 1951), pp. 119-204+206
No takes yet. Share an insight, caveat, or question.
Robert E. Woodson (1951) studied this question.