Genus of North American onagraceous plants named after the US explorer who discovered it (7)
I believe the answer is:
clarkia
(Other definitions for clarkia that I've seen before include "Lack air (anag) - garden flower" , "White, pink or purple-flowered plant" , "Showy garden plant; lack air (anagram)" .)
I've seen this clue in The Independent.
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