Gratiola L.

Fertile stamens 2, staminodes 2 or absent Gratiola

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Flowers on short peduncles less than 5 mm long. Staminodes present

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Calyx glandular pubescent. Leaves lanceolate, up to 6 mm wide, distinctly dentate. Widespread. Wet places. Fl. spring–summer. Gratiola pubescens

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Calyx glabrous. Leaves ovate to elliptic, mostly more than 8 mm wide, entire or undulate or sometimes ± dentate. Widespread. Wet places. Fl. spring–summer Gratiola peruviana