Glabrate, branched, aromatic perennial herb to 1 mn tall, densely leafy; stems soft, stout, glabrous, slightly striate. Basal leaves spatulate, to 15 cm long, the lower half narrowed into a slender winged petiole, prominently serrate upwards, callose margined; cauline leaves lanceolate, to 10 cm long, remotely denticulate or entire, sessile and somewhat clasping at the base, callose margined, glabrous or apically sparingly pubescent. Heads radiate, showy, solitary, 5-9 cm across with white ray and yellow disc florets, sometimes with one or two slender subinvolucral bracts; involucral bracts herbaceous in ca. 3 imbricate series, narrowly deltoid to oblong, ca. 10 mm long with broad, brownish, erose, hyaline margins, glabrous; receptacle convex; ray florets 20-30 in apparently 1 series, ligules 3 cm long, 5 mm broad, apically denticulate, drying with longitudinal brown lines, the tube 1-2 mm long, the style white, included, the branches colored, exserted, with a prominent, ventral groove and an expanded, truncate, flat, short-fringed apex, the ovary ca. 2 mm long, glabrous, dorsiventrally flattened, deeply 10-sulcate, the pappus an interrupted ring of scales; disc florets numerous, ca. 6 mm long, the corolla not differentiated into tube and limb, 4 mm long, obconical, apically 5-dentate, the anthers 2 mm long, basally truncate, the appendages obtuse or deltoid, the ovary 2 mm long, resembling that of the ray florets but less compressed, the style branches like those of the ray florets but the apical fringe much larger. Achene black, compressed, with conspicuously contrasting ribs, glabrous; pappus of irregular scales or wanting.
"Rhizomatous perennial 2–8 dm, simple or nearly so, glabrous or inconspicuously hairy; basal lvs oblanceolate or spatulate, 4–15 cm (petiole included), crenate and often also ± lobed or cleft, the cauline reduced and becoming sessile, deeply and distantly blunt-toothed or sometimes more closely toothed or subentire; heads solitary at the ends of the branches, naked-pedunculate, the disk 1–2 cm wide; rays 15–35, white, 1–2 cm; achenes terete, ca 10- ribbed; x=9; typically diploid, sometimes polyploid. Fields, roadsides, and waste places; native of Eurasia, naturalized throughout most of temp. N. Amer. May–Oct. (Leucanthemum l.; L. vulgare)"
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