Sessile-flowered species in the Navarretia leucocephala group (Polemoniaceae)

Navarretia myersii and N. prostrata of sect. Navarretia have a reduced habit, are nearly acaulescent, and have a terminal inflorescence. Mature floral heads bear sessile flowers and bracts on a common receptacle, surrounded by involucral leaves and bracts. This combination of features occurs also in...

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