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- Helianthella uniflora (category Helianthella)uniflorus Nuttall J. Acad. Nat. Sci. Philadelphia 7: 37. 1834 Synonyms: Helianthella uniflora var. douglasii (Torrey & A. Gray) W. A. Weber Treatment appears in4 KB (394 words) - 20:11, 5 November 2020