Gamochaeta ustulata
Gerald D. Carr

Flora of Oregon

Plants annual, biennial, or perennial, 0.4–45 cm.

Leaves basal usually withering before flowering; cauline blades spatulate to oblanceolate, 1–10 cm.

Inflorescences bracts shorter than to slightly surpassing flower clusters.

Involucres narrowly campanulate, 4.5–5 mm.

Phyllaries in 4–6 series, chartaceous, becoming brownish in fruit, sometimes green along midlines, tips sharply acute, surfaces tomentose.

Florets corollas 1–2 mm.

Fruits 0.7–0.8 mm, tan or brownish; pappi white.

Forests, grasslands, ocean bluffs, dunes, riverbanks, roadsides, disturbed areas. Flowering May–Aug. 0–1100 m. Casc, CR, Est, Sisk, WV. CA, WA; north to British Columbia. Native.

Flora of North America

as described under Gamochaeta ustulata

Annuals, biennials, or perennials, 10-40 cm; fibrous-rooted. Stems erect to ascending (commonly decumbent-ascending and rhizome like), densely white-pannose. Leaves basal and cauline, basal usually withering before flowering, blades spatulate to oblanceolate, 2-5 cm × 6-12(-35) mm (little smaller distally), faces bicolor, abaxial white-pannose, adaxial sparsely to densely arachnose-tomentose. Heads in usually continuous, rarely interrupted (proximally), cylindric arrays 1-6(-8+) cm × 12-18 mm (pressed). Involucres campanulo-urceolate, 4.5-5 mm, bases sparsely arachnose. Phyllaries in 4-6 series, outer (brown or greenish brown) broadly ovate-triangular, lengths ca. 1/2 inner, apices acute to acute-acuminate (mid phyllaries ± keeled near apices), inner oblong, laminae usually dark brown, sometimes purplish (at stereome-lamina junction), apices rounded to obtuse, apiculate. Florets: bisexual (3-)4-6; all corollas usually yellowish, sometimes purplish distally. Cypselae (tan to brownish) 0.7-0.8 mm.Flowering Apr-Jul(-Oct). Mostly coastal and near-coastal sites, dunes, ocean bluffs, sandy fields, and roadsides, clay-loam, roadcuts, ditches, cliffs, pine woods, chaparral slopes, tidal marsh edges; 0-700(-1100) m; B.C.; Calif., Oreg., Wash.Gamochaeta ustulata usually has been included in G. purpurea; it differs mostly in its longer duration, thicker and shorter stems, larger, more compact arrays of larger, brown heads, and aspects of phyllary morphology.

Photo images

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Herbarium specimens

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