Jepson Flora Project: Jepson Interchange    

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

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



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.


Species in genus: 1 sp
Etymology: (Greek: mountain Chaenactis )


O. thysanocarpha (A. Gray) Coville

Annual 1–25 cm, short-hairy to ± tomentose and glandular
Stems spreading to erect, simple or ± branched, very slender
Leaves opposite below, alternate above, simple, 1–4 cm, linear to narrowly oblong-oblanceolate, entire
Inflorescence: heads discoid, very small, sessile in small, leafy-bracted clusters at stem tips; involucre cylindric; phyllaries 4–7 in 1 series, 3–6 mm, free, oblong, ± purple; receptacle naked
Flowers 4–9; corollas 3–5 mm, yellow, lobes short-triangular; anther tips short-triangular; style tips tapered
Fruit 2.5–4 mm, club-shaped, ribbed, minutely puberulent; pappus of 11–17 scales, 1.5–2.5 mm, oblanceolate, obtuse, fringed, deciduous together in a ring
Chromosomes: 2n=18
Ecology: Open forests, dry meadows, gravelly slopes
Elevation: 2200–3800 m.
Bioregional distribution: s High Sierra Nevada.

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bioregional map for OROCHAENACTIS%20thysanocarpha being generated

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