Page authors: Don Knoke, David Giblin
Mirabilis nyctaginea
four-o'clock, heartleaf umbrellawort four-o'clock

Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Washington, east to Motana; native to central and eastern North America.

Habitat: Disturbed areas of dry valleys and plains.

Flowers: June-August

Origin: Introduced from east of the Rocky Mountains

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Bees, moths, self-pollination


Herbaceous perennial from a fleshy root, erect or ascending, glabrous below and puberulent above, branching mostly above.


Leaves opposite, the lower ones broadly deltoid or deltoid-ovate, rounded at the base and pointed at the tip, narrowed abruptly to petioles 5-20 mm. long, glabrous except for the marginal hairs, gradually reduced upward.


Inflorescence usually a congested cyme on a peduncle; flowers usually 3 in a broadly bell-shaped involucre, which is 5-7 mm. long with broadly obtuse or rounded lobes; perianth with 5 flaring lobes, 1 cm. long, glabrous, pink or white; corolla none; stamens 3-5, exerted; style 1.


Achene obovoid, 5 mm. long, wrinkled, strongly 5-ribbed.

Accepted Name:
Mirabilis nyctaginea (Michx.) MacMill.
Publication: Metasp. Minnesota Valley. 217. (as nyctagineus). 1892.

Synonyms & Misapplications:
Allonia nyctaginea Michx.
Oxybaphus nyctagineus (Michx.) Sweet
Additional Resources:

PNW Herbaria: Specimen records of Mirabilis nyctaginea in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Mirabilis nyctaginea checklist entry

OregonFlora: Mirabilis nyctaginea information

E-Flora BC: Mirabilis nyctaginea atlas page

CalPhotos: Mirabilis nyctaginea photos

11 photographs:
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