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.



Annual, biennial, perennial herb
Stems erect, simple or branched
Leaves simple, basal and alternate, petioled or upper sessile; blades entire, toothed or pinnately lobed
Inflorescence: heads radiate or discoid, 1–few, terminal; peduncles long, stout; involucre disk-shaped; phyllaries in 1–3 equal or unequal series, spreading or reflexed; receptacle conic to columnar, chaffy; chaff scales oblong, entire folded around fruits
Ray flowers 0 or many, sterile
Disk flowers many; corolla yellow to dark brown, diam of tube and throat ± equal; style tips blunt-triangular
Fruit oblong, 4-angled, ± flattened; pappus a crown of fused scales or 0
Species in genus: ± 15 species: North America
Etymology: (O.J. Rudbeck, 1630–1702, and O.O. Rudbeck, 1660–1740, professors of botany at Uppsala, Sweden)


R. occidentalis Nutt. var. occidentalis


Perennial; rhizome stout
Stems 6–20 dm, simple or few-branched above
Leaves: blade generally 10–30 cm, elliptic to widely ovate, coarsely serrate to nearly entire, glabrous or short-hairy on 1 or both surfaces
Inflorescence: heads discoid, 1–few; peduncle 15–45 cm; phyllaries 1–1.5 cm; disk ovoid, 2–6 cm; chaff dark purple
Ray flowers 0
Disk flowers: corollas 3–4 mm, dark purple
Fruit 3–5 mm; pappus 0 or scales 0.5–1 mm
Chromosomes: 2n=38
Ecology: Meadows, seeps
Elevation: 1200–1850 m.
Bioregional distribution: Klamath Ranges, n High Sierra Nevada
Distribution outside California: to Washington, Wyoming, Colorado

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bioregional map for RUDBECKIA%20occidentalis%20var.%20occidentalis 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 Rudbeckia occidentalis var. occidentalis
Retrieve dichotomous key for Rudbeckia
Retrieve multiple-entry key (MEKA) for Rudbeckia
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
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