protologue: Syn. Pl. 1: 39 (1805)
URL protologue: https://archive.org/stream/mobot31753002602149#page/39/mode/2up
6 783455 Phyllactis rigida (Ruiz & Pavon) Pers. [125 1049764 Valeriana rigida Ruiz & Pavon] M. Barnas-Pomeroy, C.F.J. Barnas, Wildflowers and landscapes of Ecuador - The way we knew it fasicle DG, : t. 29 (2014) [M. Barnas-Pomeroy]
6 783455 Phyllactis rigida (Ruiz & Pavon) Pers. [125 1049764 Valeriana rigida Ruiz & Pavon] H. Ruiz, J. Pavón, Draw. Roy. Bot. Exped. Viceroy. Peru: t. 145 [65], fig. c (1777) [I. Galvez]
6 783455 Phyllactis rigida (Ruiz & Pavon) Pers. [125 1049764 Valeriana rigida Ruiz & Pavon] H. Ruíz López, J.A. Pavon, Fl. Peruv., vol. 1 (Plates 1-152): p. 39, t. 65, fig. c (1798) [I. Galvez]
6 783455 Phyllactis rigida (Ruiz & Pavon) Pers. [125 1049764 Valeriana rigida Ruiz & Pavon] H. Ruíz López, J.A. Pavon, Fl. Peruv., vol. 1(coloured version): (Plates 1-152): p. 39, t. 65, fig. c (1798)