Strychnos asperula Sprague & Sandwith
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Floras and Monographs
Strychnos asperula Sprague & Sandwith: [Article] Krukoff, Boris A. 1965. Supplementary notes on the American species of Strychnos VII. Mem. New York Bot. Gard. 12: 1-94.
Strychnos asperula Sprague & Sandwith: [Article] Krukoff, Boris A. & Barneby, Rupert C. 1969. Supplementary notes on the American species of Strychnos. VIII. Mem. New York Bot. Gard. 20: 1-93, IX. 94-99.