TREATMENT FROM THE JEPSON MANUAL (1993) |
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©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora. |
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Annual to tree
Leaves basal or cauline, alternate to whorled, simple to compound
Inflorescence: 1° inflorescence a head, each resembling a flower, 1many, generally arrayed in cymes, generally subtended by ± calyx-like involucre; flowers 1many 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)45; stamens 45, 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):128. See glossary p. 25 for illustrations of general family characteristics.
Annual to tree-like, generally ± loosely hairy, becoming ± subglabrous; roots generally fibrous, branched
Stems generally 1few per rosette
Leaves alternate; lower generally petioled; middle generally weakly clasping; uppermost generally bract-like
Inflorescence often ± flat-topped; heads radiate or discoid, 1many; involucre cylindric to hemispheric; main phyllaries in 1 equal series (often subtended by few, much-reduced outer phyllaries)
Ray flowers 013; 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):661672.
Etymology: (Latin: old man, from white pappus)
Reference: [Barkley 1978 North America Flora II 10:50139]
Among largest genera of flowering plants.
Native |
Perennial 13+ dm, from slender rhizome, appearing ± scapose, ± subglabrous
Leaves ± fleshy; basal blades 13+ cm (< or = ± tapered petiole), ± ovate, subentire to shallowly crenate
Inflorescence: heads radiate, 1(3); main phyllaries (13)21, 68 mm, often red-tinged, tips green
Ray flowers ± 13; ligules 510+ mm
Disk flowers < 40
Fruit glabrous
Chromosomes: 2n=46
Ecology: Damp alpine meadows
Elevation: 17003500 m.
Bioregional distribution: s High Cascade Range, n&c High Sierra Nevada, Modoc Plateau
Distribution outside California: to Washington, sw Canada, Wyoming
Synonyms: S. subnudus DC. misapplied
Recent taxonomic note: *Packera subnuda (DC.) Trock & T.M. Barkley
Horticultural information: DRN, IRR: 1, 2, 3, 7, 14, 18 &SUN: 4, 5, 6, 15, 16, 17, 22, 23, 24.