Pycnophyllum in Ann. Sci. Nat., Bot., ser. 3, 6: 355. 1846 sec. Timaná (2017)
A genus of 17 Andean species that clusters close to Drymaria, a result first reported by Smissen & al. (2003) and confirmed in four further studies. This contradicts the earlier placement (e.g., Bittrich 1993b) as a member of subfamily Alsinoideae.