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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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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.


Robert Ornduff

Species in genus: 1 sp.: w US
Etymology: (Greek: stiff pappus)


R. leptocladus A. Gray

Annual < 30 cm, ± hairy
Stem simple or side branches > main axis
Leaves alternate, < 3 cm, ± erect, linear, entire
Inflorescence: heads radiate, terminal; involucre obconic; phyllaries in 2 series, < 8 mm, tapered, partly enclosing outer fruit; receptacle flat, chaffy between ray and disk flowers
Ray flowers < 15; corolla < 2 mm, pale yellow, often purple-tinged; style branches flat; stigmatic lines marginal
Disk flowers bisexual, < 60; corolla < pappus, ± cylindric, lobes generally 3–4
Fruit < 4 mm, brown; pappus of 0–5 tapered scales, < 5 mm
Chromosomes: 2n=18
Ecology: Grassy areas or among shrubs
Elevation: < 2300 m.
Bioregional distribution: Northwestern California, Cascade Range, Sierra Nevada, Great Central Valley, Central Western California, Western Transverse Ranges, San Gabriel Mountains, Modoc Plateau
Distribution outside California: to Washington, Idaho, Nevada
Generally self-pollinated.

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bioregional map for RIGIOPAPPUS%20leptocladus 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 Rigiopappus leptocladus
Retrieve dichotomous key for Rigiopappus
Overlay Consortium of California Herbaria specimen data by county on this map
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