Overview

Distribution

National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Localities documented in Tropicos sources

Argemone arizonica G.B. Ownbey:
United States (North America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
  • Flora of North America Editorial Committee, e. 1997. Magnoliidae and Hamamelidae. 3: i–xxiii, 1–590. In Fl. N. Amer. Oxford University Press, New York.   http://www.tropicos.org/Reference/24627 External link.
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Ariz.
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Global Range: North wall of Grand Canyon, Coconino County, Arizona.

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Physical Description

Morphology

Description

Plants perennial. Stems 5-8 dm, diffusely branched, often decumbent, copiously long-prickly. Leaf blades: surfaces sparingly long-prickly on veins; basal and proximal lobed nearly to midrib, lobe length often to 5 times width; distal not clasping. Inflorescences: buds ellipsoid-oblong, body 15-18 × 12-15 mm, prickly; sepal horns slender, terete, 12-15 mm, prickly at base. Flowers 7-10 cm broad; petals white; stamens 100 or more; filaments pale yellow; pistil 3-carpellate. Capsules narrowly ellipsoid-oblong, 35-45 × 10-14 mm (including stigma and excluding prickles), closely prickly, longest prickles 8-10 mm. Seeds ca. 2 mm.
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Ecology

Habitat

Precipitous slopes; of conservation concern; 1000-2000m.
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Comments: Rocky, steep slopes in pine forests and on north and south walls of canyons. 1000-2000 m elevation.

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Life History and Behavior

Cyclicity

Flowering/Fruiting

Flowering spring; fruiting summer.
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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: N1 - Critically Imperiled

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NatureServe Conservation Status

Rounded Global Status Rank: G1 - Critically Imperiled

Reasons: Known only from the north wall of the Grand Canyon in Arizona.

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Threats

Comments: Possible threats from trampling by hikers from trail.

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Notes

Comments

Argemone arizonica grows well in Grand Canyon National Park, especially along the Kaibab and Bright Angel trails.
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Names and Taxonomy

Taxonomy

Comments: A distinct species in a genus of about 30 species in North and South America.

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