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.

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.

SENECIO

GROUNDSEL, RAGWORT, BUTTERWEED

Theodore M. Barkley

Annual to tree-like, generally ± loosely hairy, becoming ± subglabrous; roots generally fibrous, branched
Stems generally 1–few per rosette
Leaves alternate; lower generally petioled; middle generally weakly clasping; uppermost generally bract-like
Inflorescence often ± flat-topped; heads radiate or discoid, 1–many; involucre cylindric to hemispheric; main phyllaries in 1 equal series (often subtended by few, much-reduced outer phyllaries)
Ray flowers 0–13; ligules generally yellow to orange
Disk flowers generally < 40; corolla generally ± yellow; style tips truncate to obtuse, generally hair-tufted
Fruit cylindric; ribs shallow, often stiff-hairy; pappus of thin, minutely barbed deciduous bristles ± = fruit body
Species in genus: ± 1500 species: worldwide; some cultivated, some of unusual form
Recent taxonomic note: *For revised taxonomy of Senecio, see Barkley 1999 Sida 18(3):661–672.
Etymology: (Latin: old man, from white pappus)
Reference: [Barkley 1978 North America Flora II 10:50–139]
Among largest genera of flowering plants.

Native

S. eurycephalus A. Gray

Perennial 2–7 dm, from creeping caudex, tomentose, becoming subglabrous
Leaves: basal sometimes fallen by flower, blades 5–10+ cm, < or = petiole, ± ovate, dentate-lobed to dissected; cauline often more lobed
Inflorescence: heads radiate, 5–20; main phyllaries ± 13, sometimes 21, 8–12 mm, tips green or yellow; outer phyllaries inconspicuous
Ray flowers 8(13); ligules 10–15 mm
Disk flowers < 40
Fruit glabrous
Chromosomes: 2n=46
Ecology: Drying, disturbed sites, especially on serpentine
Elevation: 300–1700 m.
Bioregional distribution: e Northwestern California, Cascade Range, n High Sierra Nevada, Modoc Plateau
Distribution outside California: s Oregon

Native

var. lewisrosei (J.T. Howell) T. Barkley

CUT-LEAVED RAGWORT

Plant arched upward, silver-gray tomentose, becoming unevenly glabrous
Leaves finely dissected (larger lobes 2-pinnately dissected)
Ecology: Serpentine slopes, canyons
Elevation: 550–900 m.
Bioregional distribution: n High Sierra Nevada (Feather River drainage, e Butte, Plumas cos.)
Synonyms: S. lewisrosei J.T. Howell
Recent taxonomic note: *Packera eurycephala (Torr. & A. Gray) W.A. Weber & Á. Löve var. lewisrosei (J.T. Howell) J.F. Bain
Horticultural information: In cultivation.
See the CNPS Inventory for information about endangerment and rarity.
previous taxon | next taxon
bioregional map for SENECIO%20eurycephalus%20var.%20lewisrosei 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 Senecio eurycephalus var. lewisrosei
Retrieve dichotomous key for Senecio
Retrieve multiple-entry key (MEKA) for Senecio
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
Return to the Jepson Interchange main page
Return to treatment index page
Glossary
    FEEDBACK
  • This page is no longer being maintained.


University & Jepson Herbaria Home Page |
General Information | University Herbarium | Jepson Herbarium |
Visiting the Herbaria | On-line Resources | Research |
Education | Related Sites
Copyright © by the Regents of the University of California