Jepson Flora Project: Jepson Interchange    

link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit 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.



Meredith A. Lane

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


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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bioregional map for PETRADORIA%20pumila%20subsp.%20pumila being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Petradoria pumila subsp. pumila
Retrieve dichotomous key for Petradoria
Overlay Consortium of California Herbaria specimen data by county on this map
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