BioStor
 | Supplementary notes on the American species of Strychnos - X R C Barneby and B A Krukoff (1969) Phytologia 19: 176-185 |
 | Supplementary notes on the American species of Strychnos - XI R C Barneby and B A Krukoff (1971) Phytologia 22: 225-243 |
 | Supplementary notes on the American species of Strychnos. XII B A Krukoff (1972) Phytologia 25: 49-54 |
 | Supplementary notes on the American species of Strychnos. XIII Rupert Barneby and Boris Krukoff (1973) Phytologia 27: 97-107 |
 | Supplementary notes on the American species of Strychnos. XIV B A Krukoff (1976) Phytologia 33: 305-322 |
 | Supplementary notes on the American species of Strychnos. XV B A Krukoff (1977) Phytologia 36: 17-22 |
 | Supplementary notes on the American species of Strychnos---XVII B A Krukoff (1979) Phytologia 41: 201-238 |
 | Supplementary notes on the American species of Strychnos. XIX B A Krukoff (1980) Phytologia 46: 65-77 |
 | Supplementary notes on the American species of Strychnos---XX B A Krukoff (1982) Phytologia 50: 73-79 |