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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.

PETRADORIA

ROCK GOLDENROD

Meredith A. Lane


Species in genus: 1 sp.: w North America
Etymology: (Greek: rock goldenrod)

Native

P. pumila (Nutt.) Greene subsp. pumila

Perennial < 3 dm, light green, glabrous, taprooted
Stems several, erect, striate, gummy
Leaves alternate, 2–12 cm, linear to (ob)lanceolate, leathery, 3-veined, resin-dotted, entire; margins scabrous
Inflorescence: heads radiate, many, in dense, flat-topped clusters; involucres < 10 mm, < 3 mm diam, cylindric; phyllaries 10–21 in 3–6 series, oblong to ovate, light yellow, tips green; receptacle naked
Ray flowers 2–3; ligules yellow
Disk flowers 2–4, staminate; corollas < 6.2 mm, yellow
Fruit 4–5 mm, 6–9-veined, compressed, glabrous; pappus bristles thread-like, ± twisted, brownish
Chromosomes: 2n=18
Ecology: Rocky soils, pine forest to juniper scrub, often on limestone
Elevation: 2300–3400 m.
Bioregional distribution: Desert Mountains
Distribution outside California: to Idaho, Wyoming, New Mexico
Flowering time: Jul–Oct
Reference: [Anderson 1963 Trans KS Acad Sci 66:632–684]
Horticultural information: TRY.
See the CNPS Inventory for information about endangerment and rarity.
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