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

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

Phenology Flowering late spring–summer.
Habitat Moist areas in woods, shaded edges of creeks, talus slopes
Elevation 300-3400 m (1000-11200 ft)
Distribution
from FNA
CA; CO; ID; MT; OR; UT; WA; WY; AB; BC
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 5, p. 110.
Parent taxa 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
Synonyms Alsine obtusa, Alsine viridula, Alsine washingtoniana, S. viridula, S. washingtoniana
Name authority Engelmann: Bot. Gaz. 7: 5. (1882)
Web links