A genus of 9 species, herbs, of e. and se. Asia.
ID notes: additional species are likely naturalized in our area. See references.
Ref: Conran & Tamura In Kubitzki (1998a); Floden & Avent (2019); Judd (2003); Nesom (2010j); Roling, Howlett, & Brown (2011); Serviss et al. (2016); Spaulding, Barger, & Nesom (2010). Show full citations.