1 literature reference for Pirea olgae (Regel & Schmalh.) T. Durand ex Prantl:

Author: Durand, T.A. ex Prantl, K.A.E.
Year: 1891
Title:
Source: In: Engler, H.G.A. & Prantl, K.A.E. Natürl. Pflanzenfam. 3(2): 183.