Harrisia gracilis var. simpsonii (Small ex Britton & Rose) D.B.Ward in Novon 14: 367. 2004.

Nomenclatural References

• person : Daniel Bertram Ward (1928-2016) Based on occurrence of standard abbreviation 'D.B.Ward' in the authors string.
• person : John Kunkel Small (1869-1938) Based on occurrence of standard abbreviation 'Small' in the authors string.
• person : Joseph Nelson Rose (1862-1928) Based on occurrence of standard abbreviation 'Rose' in the authors string.
• person : Nathaniel Lord Britton (1859-1934) Based on occurrence of standard abbreviation 'Britton' in the authors string.