Stellaria obtusa |
Stellaria humifusa |
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blunt-sepal starwort, obtuse starwort, Rocky Mountain chickweed, Rocky Mountain starwort |
salt-marsh starwort, saltmarsh stitchwort |
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Habit | Plants perennial, creeping, often matted but not forming cushions, rhizomatous. | Plants perennial, forming small to large mats or clumps, from slender rhizomes. |
Stems | prostrate, branched, 4-sided, 3–23 cm, internodes equaling or longer than leaves, glabrous, rarely pilose. |
decumbent, freely branched, square, 2–20 cm, glabrous, rooting at proximal nodes. |
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. |
sessile; blade elliptic to elliptic-lanceolate, 0.4–1.5 cm × 1–5 mm, succulent, base cuneate to rounded, margins entire, apex acute to obtuse, glabrous or with few cilia along margins. |
Inflorescences | with flowers solitary, axillary; bracts absent. |
with flowers solitary in axils of foliage leaves; bracts absent. |
Pedicels | spreading, 3–12 mm, glabrous. |
ascending, straight or nearly so, usually 5–10(–30) 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. |
ca. 10 mm diam.; sepals 5, prominently 1–3-veined, lanceolate, 4–5 mm, margins convex, narrow, scarious, apex acute, glabrous; petals 5, 4–6 mm, equaling sepals; stamens 10; styles 3, ascending and outwardly curved, 1–1.5 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. |
straw colored, ovoid, 4–5 mm, equaling sepals, apex obtuse, opening by 6 valves; carpophore absent. |
Seeds | grayish black, broadly elliptic, 0.5–0.7 mm diam., finely reticulate. |
pale brown, broadly and obliquely reniform, 0.8–1 mm diam., smooth to slightly rugose. |
2n | = 26, 52, ca. 65, ca. 78. |
= 26. |
Stellaria obtusa |
Stellaria humifusa |
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Phenology | Flowering late spring–summer. | Flowering summer. |
Habitat | Moist areas in woods, shaded edges of creeks, talus slopes | Lake shores, beaches, marshes, salt marshes, mainly northern coastal |
Elevation | 300-3400 m (1000-11200 ft) | 0-100 m (0-300 ft) |
Distribution |
CA; CO; ID; MT; OR; UT; WA; WY; AB; BC
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AK; ME; BC; MB; NB; NL; NS; NT; NU; ON; PE; QC; YT; SPM; Greenland; arctic Europe; Asia (Russian Far East, Siberia)
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Discussion | Stellaria humifusa is often confused with S. crassifolia, but has thicker stems and fleshy leaves that wrinkle and tend to turn brownish when dried. Also, in S. crassifolia the long pedicels are very slender and sharply angled below the capsule. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 5, p. 110. | FNA vol. 5, p. 106. |
Parent taxa | Caryophyllaceae > subfam. Alsinoideae > Stellaria | Caryophyllaceae > subfam. Alsinoideae > Stellaria |
Sibling taxa | ||
Synonyms | Alsine obtusa, Alsine viridula, Alsine washingtoniana, S. viridula, S. washingtoniana | Alsine humifusa, S. humifusa var. marginata, S. humifusa var. oblongifolia, S. humifusa var. suberecta |
Name authority | Engelmann: Bot. Gaz. 7: 5. (1882) | Rottbøll: Skr. Kiøbenhavnske Selsk. Laerd. Elsk. 10: 447, plate 4, fig. 14. (1770) |
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