Herman, P.P. 2022.

Hilliardiella elaeagnoides and H. oligocephala (Asteraceae, Vernonieae), two distinct species and the description of a new variety

. Phytotaxa. 570, 1 (Oct. 2022), 29–42. DOI:https://doi.org/10.11646/phytotaxa.570.1.3.