Minuartia pusilla

(S. Watson) Mattfeld

Bot. Jahrb. Syst. 57(Beibl. 126): 28. 1921.

Common names: Annual sandwort dwarf stitchwort
Basionym: Arenaria pusilla S. Watson Proc. Amer. Acad. Arts 17: 367. 1882
Synonyms: Alsinopsis pusilla (S. Watson) Rydberg
Treatment appears in FNA Volume 5. Treatment on page 132. Mentioned on page 116, 118, 123.

Plants annual. Taproots threadlike. Stems spreading to erect, green, 1–5 cm, glabrous, internodes of all stems 2–10 times as long as leaves. Leaves not overlapping, irregularly spaced, connate proximally, with loose, mostly herbaceous sheath 0.2–0.3 mm; blade ascending to widely spreading, green, concave proximally, flat distally, obscurely 1-veined, awl-shaped to lanceolate, 1.5–5 × 0.2–1.5 mm, flexuous, margins not thickened, scarious throughout or proximally, smooth, apex green or purple, acute to obtuse, flat to navicular, often shiny, glabrous; axillary leaves absent. Inflorescences 2–9-flowered, open cymes; bracts subulate, herbaceous, margins scarious proximally. Pedicels 0.1–0.5 cm, glabrous. Flowers: hypanthium disc-shaped; sepals 1-veined, or weakly 3-veined in proximal 1/5, ovate to lanceolate (herbaceous portion lanceolate to narrowly so), 1.5–3.5 mm, not enlarging in fruit, apex green or purple, acute to acuminate, not hooded, glabrous; petals narrowly lanceolate, 0.5–1 times as long as sepals, apex narrowly acute, entire, or absent. Capsules on stipe ca. 0.1 mm, ± ovoid, ca. 3 mm, equaling or longer than sepals. Seeds brown or reddish, asymmetically reniform with radicle prolonged into beak, not compressed, 0.5–0.6 mm, minutely papillate.

Phenology: Flowering spring–summer.
Habitat: Plains, pine barrens, dry rock cliffs
Elevation: 50-2400 m


V5 271-distribution-map.gif

B.C., Calif., Idaho, Nev., Oreg., Utah, Wash.


Selected References


Lower Taxa

... more about "Minuartia pusilla"
Richard K. Rabeler +, Ronald L. Hartman +  and Frederick H. Utech +
(S. Watson) Mattfeld +
Arenaria pusilla +
Annual sandwort +  and dwarf stitchwort +
B.C. +, Calif. +, Idaho +, Nev. +, Oreg. +, Utah +  and Wash. +
50-2400 m +
Plains, pine barrens, dry rock cliffs +
Flowering spring–summer. +
Bot. Jahrb. Syst. +
Alsinopsis pusilla +
Minuartia pusilla +
Minuartia +
species +