Tripleurospermum maritimum

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.