Allionia incarnata L.
Trailing Windmills, Trailing Four O'Clock, Pink Windmills, Trailing Allionia
Nyctaginaceae (Four O'clock Family)
USDA Symbol: ALIN
The orchid-colored trailing four-o’clock is a vine that grows along the ground; the plant may be 10 feet across. The stems, leaves, and buds are covered with soft white hair. The stems and flowers are sticky, and one rarely finds a flower without grains of sand stuck on the upper surface. Technically, what appears to be 1 flower is a cluster of 3 resembling a single radially symmetrical flower but no one but a trained botanist would ever guess it.
The flowers remain open most of the day, not just in the evening as suggested by the name. The other species, Smooth Trailing Four-o'clock (A. choisyi), from Arizona to Texas and southward, has a perianth 3/16 of an inch (5 mm) long or less, and the curved edges of the fruit each bear 5-8 slender, gland-tipped teeth.
From the Image Gallery
Plant CharacteristicsDuration: Perennial
Size Notes: Stems procumbent, up to about 5 feet long.
Bloom InformationBloom Color: Pink , Purple
Bloom Time: Jan , Feb , Mar , Apr , May , Jun , Jul , Aug , Sep , Oct , Nov , Dec
Bloom Notes: Primary flowering time is spring through fall, but may flower year-round.
DistributionUSA: AZ , CA , CO , NM , NV , OK , TX , UT
Native Distribution: Southeastern California to southern Utah and Colorado; south to Texas, Mexico, and beyond.
Native Habitat: Dry gravelly or sandy soils in sun.
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Sibley Nature Center - Midland, TX
Herbarium Specimen(s)NPSOT 0616 Collected Oct 30, 1993 in Comal County by Mary Beth White
BibliographyBibref 248 - Texas Wildflowers: A Field Guide (1984) Loughmiller, C. & L. Loughmiller
Bibref 328 - Wildflowers of Texas (2003) Ajilvsgi, Geyata.
Search More Titles in Bibliography
Web ReferenceWebref 30 - Calflora (2018) Calflora
Webref 38 - Flora of North America - beta site (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter
Additional resourcesUSDA: Find Allionia incarnata in USDA Plants
FNA: Find Allionia incarnata in the Flora of North America (if available)
Google: Search Google for Allionia incarnata
MetadataRecord Modified: 2022-11-04
Research By: TWC Staff