Minuartia howellii

(S. Watson) Mattfeld

Bot. Jahrb. Syst. 57(Beibl. 126): 27. 1921.

Common names: Howell’s stitchwort
Basionym: Arenaria howellii S. Watson Proc. Amer. Acad. Arts 20: 354. 1885
Synonyms: Alsinopsis howellii (S. Watson) A. Heller
Treatment appears in FNA Volume 5. Treatment on page 127. Mentioned on page 117, 124.

Plants annual. Taproots moderately stout. Stems erect to spreading, green, becoming purple, 12–30 cm, mostly glabrous, internodes of all stems 2–7 times as long as leaves. Leaves sometimes overlapping proximally, often connate proximally, with loose, scarious to herbaceous sheath 0.2–0.5 mm; blade straight to recurved, green, becoming purple, concave, prominently 1(–3)-veined abaxially, linear-lanceolate, 5–15 × 1–2.5 mm, rigid, margins not thickened, slightly scarious, smooth, apex green to purple, obtuse to acute, often apiculate, flat to navicular, dull, densely stipitate-glandular; axillary leaves absent. Inflorescences 5–25+-flowered, open cymes; bracts lanceolate to ovate, herbaceous. Pedicels 0.3–4+ cm, stipitate-glandular. Flowers: hypanthium disc-shaped; sepals weakly veined proximally, ovate (herbaceous portion ovate to narrowly so), 1.9–3 mm, not enlarging in fruit, apex often purple, ± acute to acuminate, not hooded, stipitate-glandular proximally; petals oblanceolate, 1.8–2.3 times as long as sepals, apex rounded, entire. Capsules on stipe ca. 0.2 mm, broadly ovoid, 2.7–3.5 mm, usually longer than sepals. Seeds blackish brown, suborbiculate with radicle prolonged to rounded beak, somewhat compressed, 1.4–1.7 mm, tuberculate; tubercles low, rounded, often elongate.

Phenology: Flowering spring–summer.
Habitat: Chaparral, Jeffrey pine-oak woodlands, serpentine
Elevation: 500-1000 m


Selected References


Lower Taxa

... more about "Minuartia howellii"
Richard K. Rabeler +, Ronald L. Hartman +  and Frederick H. Utech +
(S. Watson) Mattfeld +
Arenaria howellii +
Howell’s stitchwort +
Calif. +  and Oreg. +
500-1000 m +
Chaparral, Jeffrey pine-oak woodlands, serpentine +
Flowering spring–summer. +
Bot. Jahrb. Syst. +
Alsinopsis howellii +
Minuartia howellii +
Minuartia +
species +