Overview

Distribution

National Distribution

Canada

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Localities documented in Tropicos sources

Stellaria americana (Porter ex B.L. Rob.) Standl.:
China (Asia)
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.
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Alta.; Mont.
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Global Range: Montana (5 counties) and southwest Alberta. Falsely reported from British Columbia (Kartesz 1999).

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Physical Description

Morphology

Description

Plants perennial, forming loose, prostrate mats, from rhizomatous rootstocks. Stems spreading, branched, very leafy, 4-angled, 10-20 cm, short glandular-puberulent on internodes. Leaves sessile; blade ovate to ovate-lanceolate, widest at or above middle, 8-30 × 2-13 mm, base round to cuneate, margins not scarious, apex usually obtuse, viscid. Inflorescences terminal, 1-5-flowered, very leafy cymes; bracts foliaceous. Pedicels ca. 10 mm in flower, elongating, recurved, and tortuous in fruit, glandular-pubescent, pushing capsule into substrate. Flowers 5-10 mm; sepals 5, obscurely veined, ovate-obtuse, 3-5 mm, margins narrow, scarious, glandular-pubescent; petals 5, 4-6 mm; stamens 5; styles 3, ascending, equaling petals. Capsules green to straw colored, broadly ovoid to globose, 5-6 mm, apex obtuse, tardily dehiscent with 3 valves; carpophore absent. Seeds 3-6, rusty brown, ± ovate, ca. 2.5 mm diam., finely tuberculate.
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Diagnostic Description

Synonym

Stellaria dichotoma Linnaeus var. americana Porter ex B. L. Robinson, Proc. Amer. Acad. Arts 29: 289. 1894; Alsine americana (Porter ex B. L. Robinson) Rydberg; Arenaria stephaniana (Willdenow ex Schlechtendal) Shinners var. americana (Porter ex B. L. Robinson) Shinners
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Ecology

Habitat

Rocky slopes, talus; 1400-2800m.
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Comments: Rocky slopes, high elevations.

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Life History and Behavior

Cyclicity

Flowering/Fruiting

Flowering late Jul-Aug.
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Conservation

Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: N1 - Critically Imperiled

United States

Rounded National Status Rank: N3 - Vulnerable

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NatureServe Conservation Status

Rounded Global Status Rank: G3 - Vulnerable

Reasons: Small range and high-elevation habitat are limiting factors; information on local abundance at good sites needed.

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Notes

Comments

Stellaria americana is remarkable for its tortuous fruiting pedicels, which push the opening capsule with its small number of large seeds into the substrate.
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