Stellaria obtusa |
Stellaria littoralis |
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blunt-sepal starwort, obtuse starwort, Rocky Mountain chickweed, Rocky Mountain starwort |
beach starwort, beach starwort or chickweed, shore chickweed |
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Habit | Plants perennial, creeping, often matted but not forming cushions, rhizomatous. | Plants perennial, straggling to scandent, from elongate rhizomes. |
Stems | prostrate, branched, 4-sided, 3–23 cm, internodes equaling or longer than leaves, glabrous, rarely pilose. |
ascending, often decumbent at base, branched, 4-sided, 10–60 cm, uniformly and softly pubescent. |
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 ovate to ovate-lanceolate, widest proximal to middle, 1–4.5 cm × 4–20 mm, base round, margins densely ciliate, apex shortly acuminate, pubescent on both surfaces. |
Inflorescences | with flowers solitary, axillary; bracts absent. |
terminal, 5–many-flowered, leafy cymes; bracts foliaceous, 4–40 mm, margins ciliate, not scarious. |
Pedicels | spreading, 3–12 mm, glabrous. |
ascending to erect, straight, spreading to reflexed at base in fruit, 5–20 mm. |
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. |
9–10 mm diam.; sepals (4–)5, 3-veined, lanceolate, 2.8–5 mm, margins narrow, scarious, apex acuminate, ciliate-pubescent mainly on margins and veins; petals 5, 4–6 mm, equaling or slightly longer than sepals, blade apex deeply 2-fid; stamens 10; styles 3, ascending, ca. 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. |
green to straw colored, lanceoloid-ovoid, 5–6 mm, slightly longer than sepals, apex obtuse, opening by 3, tardily 6, ascending valves; carpophore absent. |
Seeds | grayish black, broadly elliptic, 0.5–0.7 mm diam., finely reticulate. |
reddish brown, broadly and obliquely ovate, ± 1 mm diam., minutely rugose. |
2n | = 26, 52, ca. 65, ca. 78. |
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Stellaria obtusa |
Stellaria littoralis |
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Phenology | Flowering late spring–summer. | Flowering spring. |
Habitat | Moist areas in woods, shaded edges of creeks, talus slopes | Marshy fields, marshes, coastal bluffs |
Elevation | 300-3400 m (1000-11200 ft) | less than 100 m (less than 300 ft) |
Distribution |
CA; CO; ID; MT; OR; UT; WA; WY; AB; BC
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CA
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Discussion | Stellaria littoralis is very similar to S. dichotoma Linnaeus from China, the Russian Far East, and Siberia. It may be conspecific with the latter and may have been introduced into the San Francisco area in the early days of exploration of the Pacific coast. A more detailed study is warranted. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 5, p. 110. | FNA vol. 5, p. 107. |
Parent taxa | Caryophyllaceae > subfam. Alsinoideae > Stellaria | 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) | Torrey: in War Department [U.S.], Pacif. Railr. Rep. 4(5): 69. (1857) |
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