Definitions for onopordum

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Princeton's WordNet

  1. Onopordum, genus Onopordum, Onopordon, genus Onopordon(noun)

    a genus of Eurasian herbs of the family Compositae with prickly foliage and large purplish flowers

Freebase

  1. Onopordum

    Onopordum L. is a genus of about 40 species of thistles belonging to the family Asteraceae, native to Europe, northern Africa, the Canary Islands, the Caucasus, and southwest and central Asia. They grow on disturbed land, roadsides, arable land and pastures. They are biennials with branched, spinose winged stems, growing 0.5–3 m tall. In the first season they form a basal rosette of gray-green felted leaves and rarely a few flower heads. In the second season they grow rapidly to their final height, flowering extensively, and then die off after seed maturation. The leaves are dentate or shallowly lobed to compound with several pinnatifid or deeply cut leaflets, and strongly spiny. The terminal flower head is typical for thistles, a semi-spherical to ovoid capitulum with purple disc florets. There are no ray florets. The receptacle is glabrous with dentate margins. The tube of the corolla is slender, sac-shaped and symmetrical. The anthers have awl-shaped outgrowths on the top. The capitula have several overlapping rows of leathery basal simple linear-lanceolate spines. These are smooth to slightly pubescent.

U.S. National Library of Medicine

  1. Onopordum

    A plant genus of the family ASTERACEAE. Members contain eudesmane and elemane SESQUITERPENES.

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