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blunt-sepal starwort, obtuse starwort, Rocky Mountain chickweed, Rocky Mountain starwort

beach starwort, beach starwort or chickweed, shore chickweed

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.

Stellaria obtusa

Stellaria littoralis

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
from FNA
CA; CO; ID; MT; OR; UT; WA; WY; AB; BC
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
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.)

Source FNA vol. 5, p. 110. FNA vol. 5, p. 107.
Parent taxa Caryophyllaceae > subfam. Alsinoideae > Stellaria Caryophyllaceae > subfam. Alsinoideae > Stellaria
Sibling taxa
S. alaskana, S. alsine, S. americana, S. borealis, S. calycantha, S. corei, S. crassifolia, S. crispa, S. cuspidata, S. dicranoides, S. fontinalis, S. graminea, S. holostea, S. humifusa, S. irrigua, S. littoralis, S. longifolia, S. longipes, S. media, S. neglecta, S. nitens, S. pallida, S. palustris, S. parva, S. porsildii, S. pubera, S. ruscifolia, S. umbellata
S. alaskana, S. alsine, S. americana, S. borealis, S. calycantha, S. corei, S. crassifolia, S. crispa, S. cuspidata, S. dicranoides, S. fontinalis, S. graminea, S. holostea, S. humifusa, S. irrigua, S. longifolia, S. longipes, S. media, S. neglecta, S. nitens, S. obtusa, S. pallida, S. palustris, S. parva, S. porsildii, S. pubera, S. ruscifolia, S. umbellata
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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