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Allionia choisyi (Smooth trailing four o'clock)
Bransford, W.D. and Dolphia

Allionia choisyi

Allionia choisyi Standl.

Smooth Trailing Four O'Clock, Trailing Four O'Clock, Annual Windmills, Umbrellawort, Garapatilla

Nyctaginaceae (Four O'clock Family)



USDA Native Status: L48 (N)

Allionia choisyi 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. It is found from southwestern North America (Utah, Arizona, New Mexico, and Texas) south through Mexico and Central America to South America, as well as throughout the Caribbean.


From the Image Gallery

4 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Annual
Habit: Herb
Fruit Type: Accessory
Size Notes: Stems procumbent, up to about 6 feet long.

Bloom Information

Bloom Color: White , Pink
Bloom Time: May , Jun , Jul , Aug , Sep
Bloom Notes: Pale pink to magenta, sometimes nearly white. May flower year-round under the right conditions.


USA: AZ , CO , NM , TX , UT

Herbarium Specimen(s)

NPSOT 0870 Collected May 4, 1994 in Bexar County by Harry Cliffe
NPSOT 0561 Collected Oct 13, 1993 in Comal County by Mary Beth White
NPSOT 0629 Collected Nov 6, 1993 in Bexar County by Mike Fox

3 specimen(s) available in the Digital Herbarium

Web Reference

Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

USDA: Find Allionia choisyi in USDA Plants
FNA: Find Allionia choisyi in the Flora of North America (if available)
Google: Search Google for Allionia choisyi


Record Modified: 2022-11-04
Research By: TWC Staff

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