Place of publication:
Engl. bot. ed. 3[B], 2:191. 1864 (C. H. Persoon, Syn. pl. 2:234. 1806 "β prostratum")
Comment:
fide Greuter (1968 and pers. comm. via e-mail on 4 Aug 2014) the taxa preceded by Greek letters in Persoon's work should be treated as unranked