Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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Elizabeth McClintock

Annual to perennial herb, rarely shrub, sometimes armed with prickles
Stem generally branched
Leaves simple, generally in basal rosettes and cauline, generally opposite, ± fused at base around stem, entire, toothed, or pinnately lobed or dissected, petioled or sessile; stipules 0
Inflorescence: head, terminal, on long peduncle, many-flowered, dense, ± spheric or cylindric, subtended by involucre; each flower generally enclosed ± at base by an involucel of 1–2 generally fused bractlets, this generally expanded above or in fruit, generally subtended by a receptacle bract
Flower bisexual, ± bilateral, especially outermost; calyx limb cup-shaped or divided into 4–5(10) linear or bristle-like segments; corolla ± funnel-shaped, lobes 4–5, < tube, generally unequal; stamens generally 4, attached to corolla tube, alternate lobes; ovary inferior, 1-chambered, style slightly exserted from corolla, stigma 2-lobed
Fruit: achene, enclosed by sometimes enlarged involucel, generally topped by persistent calyx
Genera in family: 10–11 genera, 270–350 species: Eur to e Asia, c&s Africa; several cultivated for ornamental
Reference: [Moore 1976 Flora Europaea 4:56–72]
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