Entire-leaved daisy

Chrysanthemum integrifolium Richardson in J. Franklin et al., Narr. Journey Polar Sea, 749. 1823; Arctanthemum integrifolium (Richardson) Tzvelev; Dendranthema integrifolium (Richardson) Tzvelev; Leucanthemum integrifolium (Richardson) de Candolle

Rhizomes 1–3 mm diam. Leaves: blades (2–)4–18(–30) × 0.8–1.2(–2) mm. Peduncular bracts 0–3, remote, distal (mostly beyond midstem), 4.5–7 mm, margins and apices brown, hyaline, erose, scarious. Phyllaries 5–8 × 2–3 mm. Ray laminae (4–)6–7 × 2–3.2 mm, with 2–5 hairs inside opening of tube. Disc corollas 2.5–3 mm, tubes greenish, lobes 0.35–0.5 mm, reflexed, tips brown and callous. Cypselae brown, 1.5–2 mm, ribs pale. 2n = 18.

Flowering summer. Alpine zones, moist to mesic gravelly sites, arctic tundra, moist to well-drained, exposed areas with low organic content, on rock, gravel, sand, silt, clay, till, or moss, calcareous or not, seldom on sea beaches or areas exposed to salt spray; 0–500+ m; B.C., N.W.T., Nunavut, Que., Yukon; Alaska; e Asia (Russian Far East).