Stellaria obtusa |
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blunt-sepal starwort, obtuse starwort, Rocky Mountain chickweed, Rocky Mountain starwort |
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Habit | Plants perennial, creeping, often matted but not forming cushions, rhizomatous. |
Stems | prostrate, branched, 4-sided, 3–23 cm, internodes equaling or longer than leaves, glabrous, rarely pilose. |
Leaves | sessile or short-petiolate; blade broadly ovate to elliptic, 0.2–1.2 cm × 0.9–7 mm, base round or cuneate, margins entire, apex acute, shiny, glabrous or ciliate near base. |
Inflorescences | with flowers solitary, axillary; bracts absent. |
Pedicels | spreading, 3–12 mm, glabrous. |
Flowers | 1.5–2 mm diam.; sepals 4–5, veins obscure, midrib sometimes apparent, ± ovate, 1.5–3.5 mm, margins narrow, scarious, apex ± obtuse, glabrous; petals absent; stamens 10 or fewer; styles 3(–4), curled, shorter than 0.5 mm. |
Capsules | green to pale straw colored, translucent, globose to broadly ovoid, 2.3–3.5 mm, 1.9–2 times as long as sepals, apex obtuse, opening by 6 valves; carpophore absent. |
Seeds | grayish black, broadly elliptic, 0.5–0.7 mm diam., finely reticulate. |
2n | = 26, 52, ca. 65, ca. 78. |
Stellaria obtusa |
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Phenology | Flowering late spring–summer. |
Habitat | Moist areas in woods, shaded edges of creeks, talus slopes |
Elevation | 300-3400 m (1000-11200 ft) |
Distribution |
CA; CO; ID; MT; OR; UT; WA; WY; AB; BC
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Source | FNA vol. 5, p. 110. |
Parent taxa | Caryophyllaceae > subfam. Alsinoideae > Stellaria |
Sibling taxa | |
Synonyms | Alsine obtusa, Alsine viridula, Alsine washingtoniana, S. viridula, S. washingtoniana |
Name authority | Engelmann: Bot. Gaz. 7: 5. (1882) |
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