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Anulocaulis leiosolenus

Anulocaulis leiosolenus (Torr.) Standl.

Southwestern Ringstem

Nyctaginaceae (Four O'clock Family)


USDA Symbol: ANLE5

USDA Native Status: L48 (N)

An ungainly, spindly plant with large fleshy leaves near base and pale pink or pink and white, trumpet-shaped flowers scattered about widely branched top.

In the heat of the day, the tubes of spent flowers hang bedraggled. At sundown, as new flowers open, the long stamens and style unravel and align in a graceful sweep from the narrow opening. The common name ringstem derives from the sticky, glandular rings encircling the stem.


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Plant Characteristics

Duration: Perennial
Habit: Herb
Size Class: 3-6 ft.

Bloom Information

Bloom Time: Jun , Jul , Aug , Sep , Oct , Nov


USA: AZ , NM , NV , TX
Native Distribution: Southern Nevada, central Arizona, southern New Mexico, and western Texas.
Native Habitat: On rocky soil containing gypsum.

Additional resources

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


Record Modified: 2007-01-01
Research By: TWC Staff

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