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©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.

PLEUROCORONIS

ARROW-LEAF

A. Michael Powell

Perennial or subshrub
Leaves opposite below, alternate above
Inflorescence open; heads discoid, few; phyllaries in several series, outer short, ovate, inner lanceolate; receptacle ± flat, naked
Flowers 25–30; anther bases ± rounded, tips ovate or oblong; style branches, ± 1.5 mm, club-shaped
Fruit ellipsoid to obconic, 4–5-ribbed; sides densely hairy; pappus of bristles and scales
Species in genus: 3 species: sw US, nw Mex
Etymology: (Greek & Latin: side crown, from pappus)
Reference: [King & Robinson 1987 Monogr Syst Bot Missouri Bot Garden 22:237–239]

Native

P. pluriseta (A. Gray) R.M. King & H. Rob.

Subshrub < 60 cm
Leaves thin; blades 3–10 mm (<< glandular petioles), lanceolate to ± diamond-shaped, generally few-toothed, glabrous or ± glandular
Inflorescence: heads 6–11 mm; phyllaries ± 25, 2.5–6 mm, glandular, tips darker, generally recurved
Flowers: corollas 4–5 mm
Fruit 3–4 mm; pappus bristles 10–16, 2.5–5 mm, scales 10–12, 1–2 mm
Chromosomes: 2n=18
Ecology: Common. Rocky creosote-bush scrub
Elevation: < 1300 m.
Bioregional distribution: Desert
Distribution outside California: to Utah, Arizona, nw Mexico
Flowering time: Mar–May, Oct–Jan
Synonyms: Hofmeisteria p. A. Gray

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