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

salt-marsh starwort, saltmarsh stitchwort

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

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
from FNA
CA; CO; ID; MT; OR; UT; WA; WY; AB; BC
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; ME; BC; MB; NB; NL; NS; NT; NU; ON; PE; QC; YT; SPM; Greenland; arctic Europe; Asia (Russian Far East, Siberia)
[WildflowerSearch map]
[BONAP county map]
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.)

Source FNA vol. 5, p. 110. FNA vol. 5, p. 106.
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. irrigua, S. littoralis, 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 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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