Wist, T. J., & Davis, A. R. Floral structure and dynamics of nectar production in Echinacea pallida var. angustifolia (Asteraceae).

Wist, Tyler J., و Arthur R. Davis. Floral Structure and Dynamics of Nectar Production in Echinacea Pallida Var. Angustifolia (Asteraceae).

Wist, Tyler J., و Arthur R. Davis. Floral Structure and Dynamics of Nectar Production in Echinacea Pallida Var. Angustifolia (Asteraceae).