Species plantarum: exhibentes plantas rite cognitas, ad genera relatas, cum differentiis specificis, nominibus trivialibus, synonymis selectis, locis natalibus, secundum systema sexuale digestas Author Linnaeus, Carolus text 1753 Laurentius Salvius Stockholm https://doi.org/10.5962/bhl.title.669 book 10.5281/zenodo.3931989 3931989 Dorstenia contrajerva var. houstonii , var. nov. β. Dorstenia dentariae radice, folio minus laciniato, placenta quadrangulari & undulata. Houst. act. n. 421. f.2.