Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora.

ASTERACEAE

SUNFLOWER FAMILY

David J. Keil, Family Editor and author, except as specified

Annual to tree
Leaves basal or cauline, alternate to whorled, simple to compound
Inflorescence: 1° inflorescence a head, each resembling a flower, 1–many, generally arrayed in cymes, generally subtended by ± calyx-like involucre; flowers 1–many per head
Flowers bisexual, unisexual, or sterile, ± small, of several types; calyx 0 or modified into pappus of bristles, scales, or awns, which is generally persistent in fruit; corolla radial or bilateral (rarely 0), lobes generally (0)4–5; stamens 4–5, anthers generally fused into cylinder around style, often appendaged at tips, bases, or both, filaments generally free, generally attached to corolla near throat; pistil 1, ovary inferior, 1-chambered, 1-seeded, style 1, branches 2, generally hair-tufted at tip, stigmas 2, generally on inside of style branches
Fruit: achene, cylindric to ovoid, generally deciduous with pappus attached
Genera in family: ± 1300 genera, 21,000 species (largest family of dicots): worldwide. Largest family in CA. Also see tribal key to CA genera: Strother 1997 Madroño 44(1):1–28. See glossary p. 25 for illustrations of general family characteristics.

ONOPORDUM

David J. Keil and Charles E. Turner

Biennial, coarse
Stem spiny-winged
Leaves basal and cauline, alternate, dentate to deeply pinnately lobed, very spiny
Inflorescence: heads discoid, 1–7, in cymes, in CA; involucre 3–7 cm diam, (hemi)spheric; phyllaries many, in several series, spine-tipped, outer generally spreading or reflexed; receptacle naked, deeply pitted
Flowers many; corollas (nearly) radial, white to purple, tube slender, lobes linear; anther base acutely tailed, tips awl-shaped; style tip with minutely hairy node, terminal appendage subentire, 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
Species in genus: ± 40 species: Eurasia, Medit
Etymology: (Greek: name for cotton thistle)
Weedy.

Introduced

O. illyricum L.

ILLYRIAN THISTLE

Plant < 25 dm, canescent-tomentose
Leaves 1–5 dm, (deeply) pinnately lobed (lobes 8–10 pairs, triangular, entire or again lobed)
Inflorescence: phyllaries lanceolate to ovate, glabrous or ± cobwebby, spines < 5 mm
Flowers: corollas 25–35 mm, purple, lobes glandular-puberulent
Fruit 4–5 mm; pappus 10–12 mm, ± white
Chromosomes: 2n=34
Ecology: Disturbed sites
Elevation: < 500 m.
Bioregional distribution: s San Francisco Bay Area
Distribution outside California: native to se Europe

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bioregional map for ONOPORDUM%20illyricum being generated
 
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Onopordum illyricum
Retrieve dichotomous key for Onopordum
Retrieve multiple-entry key (MEKA) for Onopordum
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
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