Dwarf Blue Penstemon <i>(Penstemon glaber)</i>. (IMAGE)

Botanical Society of America

Dwarf Blue Penstemon <i>(Penstemon glaber)</i>.

Caption

This <i>American Journal of Botany</i> article confirm multiple, unidirectional evolutionary shifts from ancestral bee-pollinated flowers to hummingbird-pollinated flowers in the <I>Penstemon</i> genus.

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Photo credit: Carolyn A. Wessinger.

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