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Onopordum
Family: Asteraceae
Onopordum image
Max Licher  
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David J. Keil in Flora of North America (vol. 19, 20 and 21)
Biennials, 50-400+ cm, coarse, prickly. Stems usually erect, ± branched, spiny-winged. Leaves basal and cauline; winged-petiolate (basal) or sessile (cauline); blade bases narrowing. margins pinnately lobed or divided and dentate, teeth and lobes tipped with stout spines. Heads discoid, borne singly or in corymbiform arrays; (peduncles 0 or spiny winged). Involucres hemispheric to ovoid or spheric. Phyllaries many in 8-10+ series. linear to ovate, entire, tapered to stiff spines, middle and outer often spreading or reflexed. Receptacles flat to convex, epaleate, not bristly, alveolate with apically fringed pits. Florets many; corollas white or purple, actinomorphic or weakly zygmorphic, tubes slender, throats cylindric or narrowly goblet-shaped. lobes linear; anther bases acute-tailed, apical appendages subulate; style branches: fused portions with minutely hairy nodes, long, cylindric, minutely papillate, distinct portions minute. Cypselae ± cylindric, 4-5-angled, usually ± transversely roughened, glabrous, attachment scars basal; pappi falling in ring, of many barbed or plumose bristles, basally connate. x = 17.
Vascular plants of NE US and adjacent Canada
Similar to Cirsium, differing chiefly in the receptacle, which is flat, fleshy, and honey-combed, often with short bristle-tips on the partitions, but not densely bristly; pappus-bristles naked or plumose; spiny biennials, mostly tomentose or woolly. 40, sw. and c. Asia.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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Show all taxa
Onopordum acanthium
Image of Onopordum acanthium
Onopordum illyricum
Images
not available
Onopordum nervosum
Image of Onopordum nervosum
Onopordum tauricum
Image of Onopordum tauricum
The National Science Foundation
Developments of SEINet, Symbiota, and associated specimen databases have been supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)