Bright purple/blue flower with five petals and prominent stamens arising from herb with ovate hairy leaves.
Last week, I met Hydrolea spinosa (photo) at Cambridge Botanic Garden. Tomorrow, I'll hear a talk on taxonomy of Hydroleaceae at Edinburgh Botanic Garden. The family has 1 genus & 11 species. Part of Solanales. This species doesn't even have its own Wikipedia page :(
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