Amsinckia grandiflora is a species of fiddleneck known by the common name large-flowered fiddleneck. This is a wildflower endemic to California and considered an endangered species on the state and national level. Amsinckia grandiflora is one of four 1248 rare heterostylous species within the genus Amsinckia that have highly restricted distributions from which the more weedy homostylous congeners are thought to have evolved.

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