Tsymbalyuk, Z.M., Ivanova, D., Bell, C.D. & Nitsenko, L.M. (2022)

Pollen morphology of selected taxa of Valeriana (Caprifoliaceae): taxonomic and evolutionary implications

. Phytotaxa 577 (1): 57–78. https://doi.org/10.11646/phytotaxa.577.1.3