Herbs, annual or biennial; stems 10-35 cm tall, striate, glabrous, unbranched or branched from base. Basal leaves withered by anthesis. Lower and middle stem leaves sessile; leaf blade oblanceolate-oblong or oblong, 5.5-9.5 × 2.5-3 cm, both surfaces glabrous, tripinnatisect; ultimate segments filiform. Distal stem leaves gradually smaller, similar to proximal and middle leaves. Capitula few to many, in an apical corymb, 1-1.5 cm in diam., pedunculate. Involucres hemispheric; phyllaries in 2 or 3 rows, margin white or brownish scarious, outer ones broadly lanceolate, inner ones oblong. Ray florets white; lamina 4(-6) mm. Disk florets yellow, 5-lobed; lobes each with a resin sac. Achenes brown, triquetrous, ca. 2.5 mm, wrinkled, with 1 adaxial and 2 lateral whitish ribs, apically and abaxially with 2 distinct resin sacs. Corona ca. 0.5 mm, 3-lobed. Fl. and fr. Jun-Aug.
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