Jepson Flora Project: Jepson Interchange    

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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.



John C. Semple

Annual to perennial herb, taprooted, branched above, strigose-bristly; hairs minutely knobby
Leaves generally ± cauline, alternate; lower oblanceolate to ovate, base or petiole ± spreading-hairy; upper reduced, glandular
Inflorescence ± flat-topped; heads generally radiate; involucre ± bell-shaped; phyllaries in 3–5 graded series; receptacle naked, pitted
Ray flowers (0)10–30(40); ligules yellow
Disk flowers many; corollas yellow; style branches finely papillate, appendage narrowly triangular
Fruit obconic; ray fruit ± 3-angled, pappus 0 or of bristles; disk fruit compressed, outer pappus of narrow scales < 1 mm, inner of 30–45 bristles 3–7 mm
Species in genus: ± 30 species: especially w North America
Etymology: (Greek: different cases, from ray and disk fruits)
Reference: [Semple 1990 Brittonia 42:221–228]


H. oregona (Nutt.) Shinners

Perennial 2–10 dm, ascending to erect, ± bristly, glandular
Leaves: lower (ob)lanceolate, 0 by flower; upper sessile, wider
Inflorescence: heads discoid; involucre 7.5–14 mm; phyllaries in 5–7 series, outer 1–1.5 mm, generally lanceolate-deltate
Disk flowers 14–60; corollas 7.5–14 mm
Fruit 2–5 mm, sparsely strigose; outer pappus bristles few, < 0.5 mm, inner 30–40, ± = corolla
Chromosomes: 2n=18
Ecology: Seasonally dry streambeds
Elevation: < 1000 m.
Bioregional distribution: Northwestern California, Cascade Range, n Sierra Nevada Foothills, Central Western California
Distribution outside California: to Washington
Varieties intergrade
Synonyms: Chrysopsis o. (Nutt.) A. Gray


var. oregona

Stems ± sparsely branched above middle
Leaves of branches generally > 13 mm, > 3 mm wide, sparsely hairy, ± densely glandular
Inflorescence ± open
Ecology: Habitats and ± range (except SNF, to WA) of sp
Bioregional distribution: Northwestern California, Cascade Range, Central Western California

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bioregional map for HETEROTHECA%20oregona%20var.%20oregona 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 Heterotheca oregona var. oregona
Retrieve dichotomous key for Heterotheca
Retrieve multiple-entry key (MEKA) for Heterotheca
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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