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Information Phyllaries oblong or narrowly triangular, scarious margins pale to dark brown, 0.2–0.4 mm wide. Cypselae: resin gland lengths often much more than twice widths. 2n = 18, 36.

Information Perennials (sometimes biennials), 10–50(–80) cm. Stems 1–5+, usually procumbent, sometimes ascending (± erect), branched distally, glabrous or sparsely hairy. Leaf blades 2–8 cm, ultimate lobes ± cylindric, 4–20 mm, ± fleshy, apices obtuse or mucronate. Heads (3–)10–50 in corymbiform arrays or borne singly. Phyllaries centrally dark greenish or brownish, oblong to narrowly triangular or broadly triangular, unequal, scarious margins pale to dark brown or blackish brown, 0.2–1 mm wide. Ray florets 10–34+; corollas 10–16[–20] mm. Disc corollas ca. 2.5 mm. Cypselae pale to dark blackish brown, ribs ± contiguous or separated by less than 1/4 their widths (1–2 supernumerary ribs sometimes present), abaxial-apical resin glands elongate (lengths 2+ times widths), abaxial faces transversely rugose, minutely roughened on faces and between ribs. 2n = 18, 36.

Information Phyllaries broadly triangular, scarious margins blackish brown, 0.4–1 mm wide. Cypselae: resin gland lengths usually little more than twice widths. 2n = 18.

Information Annuals, biennials, or perennials, 5–80 cm (taprooted; scentless or nearly so). Stems 1–5+, usually erect or ascending, sometimes procumbent, branched or simple, glabrous or sparsely hairy (hairs basifixed). Leaves (not marcescent) basal (usually withering by flowering) and cauline; petiolate or sessile; blades oblong, 1–3-pinnately lobed, ultimate margins crenate or serrate, faces glabrous or sparsely hairy. Heads radiate [discoid or disciform], borne singly or in corymbiform arrays. Involucres hemispheric to patelliform, 8–12+ mm diam. Phyllaries persistent, 28–60+ in 2–5 series, distinct, broadly ovate, unequal to subequal, margins and apices (pale to dark brown or black) narrowly to widely scarious (abaxial faces glabrous). Receptacles convex to conic (± solid), epaleate. Ray florets [0] 10–34+, pistillate, fertile; corollas white [seldom pinkish], laminae mostly oblong. Disc florets 300–500, bisexual, fertile; corollas yellow [greenish], tubes cylindric (sessile-glandular), throats narrowly campanulate (cylindric or compressed), lobes 5, deltate (with resin sacs). Cypselae trigonous, ± compressed (apices truncate), ribs 3–5 (0–2 abaxial, 2 lateral, 1 adaxial, usually whitish, relatively thick, smooth), faces often rugose or tuberculate abaxially and between ribs and glabrous (pericarps sometimes with myxogenic cells and usually 2–3, sometimes 1–5, abaxial-apical resin sacs; embryo sac development tetrasporic); pappi 0 [coroniform or each an adaxial auricle]. x = 9.

Information Annuals (sometimes biennials or perennials), (5–)30–60(–80) cm. Stems 1, ascending to erect, usually branched distally, sometimes proximally, glabrous or glabrate (sparsely hairy when young). Leaf blades 2–8 cm, ultimate lobes filiform, 4–20 mm, not fleshy, apices apiculate. Heads (1–)10–200+, 3–4.5 cm diam., in corymbiform arrays of solitary heads at ends of branches. Phyllaries centrally dark greenish or brownish, oblong, subequal, scarious margins colorless to light brown, 0.1–0.2 mm wide. Ray florets 10–25; corollas (4–)10–13(–20) mm. Disc corollas 1–2.5 mm. Cypselae pale brown, ribs separated by 1/3+ their widths, abaxial-apical resin glands ± circular, faces minutely roughened between ribs. 2n = 18, 36.