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The North American sunflowers (Helianthus)

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Helianthus laetiflorus and Helianthus rigidus _ hybrids or species

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ANTHOCYANIDINS OF SOME IMPATIENS SPECIES

S. Clevenger, 1971, Evolution; international journal of organic evolution.

A NEW ANTHOCYANIDIN IN IMPATIENS

S. Clevenger, 1964 .

Anthocyanidins of Impatiens Species

S. Clevenger, 1971 .