Onopordum L. is a genus of about 40 species of thistles belonging to the family Asteraceae, native to Europe (mainly the Mediterranean region), 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 (rarely short-lived perennials) 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 (seldom white or pink) 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.
These plants propagate only by seed. The seed heads mature in mid-summer, releasing their seeds. The fruit is a glabrous achene, 4-6 mm long and with 4-50 ribs. The pappus consists of many rows of simple, fine to minutely rough hairs, united in a circular base.
Maturation temperature regulates germinability and chemical constituents of Scotch thistle (Onopordum acanthium) cypselas.
Jan 01, 2006; Abstract: The effects of maturation temperature on germinability and chemical constituents of Scotch thistle (onopordum...
Evaluation of antioxidant potentials of extracts of cotton thistle (Onopordum leptolepis DC.) obtained by various solvents
Dec 13, 2011; Abstract Medicinal plants are valuable natural resources that recently have interested in developed countries and are considered...
Evaluation of antioxidant potentials of extracts of cotton thistle (Onopordum leptolepis DC.) obtained by various solvents.(Report)
Sep 01, 2011; Introduction Onopordon (Onopordon leptolepis DC.) is a perennial plant belonging to Asteraceae family. There are seven species of...