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Key to families | Table of families and genera
Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.
Generally biennial, coarse. Stem: spiny-winged. Leaf: basal and cauline, alternate, dentate to deeply pinnately lobed, very spiny. Inflorescence: heads discoid, 1–7, in cyme-like clusters; involucre 3–7 cm diam, (hemi)spheric; phyllaries many, in 8–10+ series, spine-tipped, outer generally spreading or reflexed; receptacle epaleate, deeply pitted. Flower: many; corolla (nearly) radial, white to purple, tube slender, lobes linear; anther base acutely tailed, tips awl-shaped; style tip with minutely hairy distal node, terminal appendage ± entire, long, cylindric, minutely papillate. Fruit: ± cylindric, 4–5-angled, glabrous, generally ± cross-roughened, brown to gray-black, mottled; pappus bristles many, barbed or plumose, fused at base.
± 40 species: Eurasia, Mediterranean. (Greek: name for cotton thistle) [Keil 2006 FNANM 19:87–88]
1. Herbage green, ± sticky-glandular, short-hairy ..... O. tauricum
1' Herbage ± canescent-tomentose
2. Leaves dentate to shallowly lobed; phyllaries linear; corolla lobes not glandular ..... O. acanthium subsp. acanthium
2' Leaves ± deeply 1–2 × lobed; phyllaries lanceolate to ovate; corolla lobes glandular-puberulent ..... O. illyricum
Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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