Gratiola Linnaeus. Hedge-hyssop.
A genus of about 20 species, herbs, of temperate regions (and tropical mountains) of the Old and New Worlds. Circumscription of the genus includes Amphianthus (following Estes & Small 2007, 2008).
ID notes: Gratiola amphiantha somewhat resembles Callitriche, but has floating leaves in single pairs rather than in a whorl.
Ref: Estes & Small (2007); Estes & Small (2008); Freeman (2019b) In Flora of North America Editorial Committee (2019); Pennell (1935). Show full citations.
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© Ken-ichi Ueda, some rights reserved (CC BY), uploaded by Ken-ichi Ueda | Gratiola lutea source | Original Image ⭷
© Scott Ward | 
© Michelle, some rights reserved (CC BY), uploaded by Michelle | Gratiola brevifolia source | Original Image ⭷
© Scott Ward |