trionum

Updated: June 9, 2025

The petals of this beautiful and fragrant shrub, as well as of the Oenothera, tree primrose, and others, continue expanded but a few hours, falling off about noon, or soon after, in hot weather. And the flowers of the Hibiscus trionum are said to continue but a single hour.

Erasmus Darwin - The Botanic Garden. Part II.: Containing the Loves of the Plants. a Poem.: With Philosophical Notes.