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

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

LASTHENIA

GOLDFIELDS

Robert Ornduff

Annual, perennial herb, glabrous or hairy
Stem generally branched, generally erect, < 60 cm
Leaves opposite, < 20 cm, entire to pinnately cut
Inflorescence: heads radiate, solitary or in cymes; phyllaries in 1 or 2 series, free or partly fused; receptacle narrowly conic to hemispheric, naked, smooth, pitted, or rough
Ray flowers 4–21; ligules generally yellow
Disk flowers generally many; corollas generally 5-lobed, generally yellow; anther tips acuminate to triangular; style tips triangular or round, generally hair-tufted
Fruit < 5 mm, cylindric to obovoid, black or gray; pappus of awns, scales, or 0
Species in genus: 17 species: w North America, Chile
Etymology: (Greek: female pupil of Plato)
Reference: [Ornduff 1966 Univ Calif Publ Bot 40:1–92]
Generally self-incompatible (cross-pollinated).

Native

L. minor (DC.) Ornduff

Annual < 35 cm
Stem erect, simple or much-branched, sparsely to densely woolly
Leaves 2–12 cm, linear, entire or irregularly toothed (teeth < 1.5 cm), glabrous to soft-hairy
Inflorescence: involucre 4–6 mm, hemispheric, phyllaries 7–14, free, hairy; receptacle conic, glabrous, rough
Ray flowers < 13; ligules 4–8 mm
Disk flowers many; anther tips ovate or elliptic; style tips triangular or dome-shaped, hair-tufted
Fruit < 2.6 mm, narrowly club-shaped, glabrous or hairy; pappus of 2–3 narrowly tapered to lanceolate, brown or white scales intermixed with ± truncate, fringed shorter scales, or 0
Chromosomes: 2n=8
Ecology: Grasslands
Elevation: < 700 m.
Bioregional distribution: North Coast, s Sacramento Valley, San Joaquin Valley, Central Coast
Horticultural information: DRN, SUN: 5, 8, 9, 14, 15, 16, 17, 19, 20, 21, 22, 23, 24.

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