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Key to Hackelia

Boraginaceae

Hackelia

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1 Widest stem leaves (0-8-) 1.0-2.5 (-5) cm wide; corolla blue; upper stems and branches of the inflorescence with tightly appressed hairs
1 Widest stem leaves (2.5-) 3-5 (-9.5) cm wide; corolla white; upper stems and branches of the inflorescence with spreading-ascending hairs