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

    THIS PAGE IS NO LONGER UPDATED
    AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
  • Up-to-date information about California vascular plants is available from 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.

ENCELIA

Curtis Clark

Shrubs
Stems generally many from base
Leaves alternate, generally drought-deciduous, simple, petioled, entire or rarely toothed
Inflorescence: heads radiate or discoid, solitary or in cyme-like panicles; peduncles generally long; involucre hemispheric; phyllaries in 2–3 series, free; receptacle chaffy, scales folded around fruits and falling with them
Ray flowers sterile; style 0; ligules yellow
Disk flowers many; corollas yellow or brown-purple, tube slender, throat abruptly expanded, lobes triangular; anther tips ovate, ± acute; style tips triangular
Fruit strongly compressed, obovate or wedge-shaped; edges long-ciliate; faces glabrous or short-hairy; pappus of 2 narrow scales or 0
Species in genus: 13 species: w North America, w South America
Etymology: (Christopher Encel, 16th century)
Commonly hybridizing, especially in disturbed areas; E. farinosa X E. frutescens is common; E. farinosa X E. californica, E. farinosa X E. actoni, E. actoni X E. frutescens, E. frutescens X E. virginensis, E. farinosa X Geraea canescens have been reported.

Native

E. farinosa X E. frutescens

Shrub 5–12 dm with few–many branches from 1–several short trunks
Stems branched along their length; young stems hairy; older with rough bark
Leaves scattered along stems; petioles 5–15 mm; blades 1–5 cm, elliptic, lanceolate, or narrowly ovate, obtuse, gray-green, lightly tomentose with some strigose hairs
Inflorescence: heads radiate or sometimes discoid, 2–5 in loose panicles; peduncles glabrous or strigose; involucre 5–12 mm; phyllaries lanceolate
Ray flowers 1–11; ligules 5–20 mm, deeply 3-lobed
Disk flowers: corollas 5–6 mm, yellow
Fruit 5–8 mm; pappus 2 slender scales or 0
Chromosomes: 2n=36
Ecology: Roadsides, waste places, desert washes, flats
Elevation: < 800 m.
Bioregional distribution: Desert
Distribution outside California: w Arizona, n Baja California
Hybrids and backcrosses commonly found with parent species. Many herbarium specimens of " E. virginensis " are these.

previous taxon | next taxon
bioregional map for ENCELIA%20farinosa &mathx; E. frutescens being generated
 

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


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