北极菊 bei ji ju

Arctanthemum arcticum (Linnaeus) Tzvelev; Dendranthema arcticum (Linnaeus) Tzvelev; Leucanthemum arcticum (Linnaeus) Candolle; L. arcticum subsp. gmelinii (Ledebour) Kitamura; L. gmelinii Ledebour.

Herbs, perennial, 10-30 cm tall, with thick, fleshy, creeping rhizome. Stems erect or nearly so, solitary or few, simple or with a few lateral branches, glabrous or arachnoid pubescent and glabrescent. Basal and lower stem leaves many; petiole long, thick; leaf blade oblong to suborbicular, 9-12 × 3-4 cm, both surfaces glabrous or subglabrous, palmately to pinnately 3-7-lobed, usually divided to less than half way, base broadly cuneate, margin coarsely toothed to entire. Distal stem leaves linear. Synflorescence with 1-5 capitula; peduncles long. Involucres 1.2-2.2 × 0.4-0.7 cm; phyllaries abaxially glabrous or sparsely arachnoid pubescent at base, scarious margin broad, blackish brown or brownish. Ray floret lamina white, 10-22 × 3-5 mm; disk florets 2.3-3 mm. Achenes 1.8-2.6 × ca. 0.5 mm.

Stony and sandy places, gravel beds, grassy patches along coasts. Hebei [Russia (Far East); W North America].