Family Code: PLANTA Genus Code: GRATI Genus CN: hedgehyssop Genus Authority: L. Genus Summary: A genus of about 20 species, herbs, of temperate regions (and tropical mountains) of the Old and New Worlds. Genus Identification: Identification notes: Gratiola amphiantha somewhat resembles Callitriche, but has floating leaves in single pairs rather than in a whorl. Genus References: Estes & Small (2007)=Z; Estes & Small (2008)=Y; Pennell (1935)=P. Key based in part on Estes & Small (2007). [including Amphianthus] Last Updated: 2019-11-29 Publish: 1