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

  • Up-to-date information about California vascular plants is available from 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.



Annual, perennial herb, ± tomentose throughout
Stems 1–many from base
Leaves basal and alternate, simple, entire to deeply lobed, ± reduced upward, petioled or upper sessile, tomentose and glandular
Inflorescence: heads radiate, solitary or in few-headed cymes; peduncles short to very long; involucre cylindric to bell-shaped or hemispheric; phyllaries in 1–2 ± equal series, linear-lanceolate; receptacle flat to slightly rounded, naked or with scattered, narrow chaff
Ray flowers 4–many; ligules ovate, 3-lobed, sessile on ovary, yellow, drying cream, papery, reflexed and persistent on fruit when dry
Disk flowers 8–many; corollas yellow, gland-dotted, lobes triangular, long-hairy; anther tips triangular; style tips short-triangular
Fruit linear to club-shaped, cylindric or ± angled, short-rough hairy and gland-dotted to glabrous; pappus 0
Species in genus: 3 species: sw US, Mex
Etymology: (J.W. Bailey, Am microscopist, born 1811)
Reference: [Brown 1973 PhD dissertation, AZ State Univ]


B. pleniradiata A. Gray

Annual, canescent-tomentose
Stems 1–5 dm, branched mostly in basal half
Leaves mostly cauline; basal generally withering by time of flower; basal and lower cauline similar, 2–8 cm, petioled; blade 1–3 X divided into oblong to ovate lobes; upper cauline sessile, simple, linear to narrowly oblanceolate, generally entire
Inflorescence: heads solitary; peduncles 2–10 cm; involucre 7–10 mm diam, hemispheric; phyllaries 20–30, 4–6 mm
Ray flowers 20–60, in 2 or more series; ligules 6–10 mm, widely elliptic to obovate, ± entire to shallowly 3-lobed, bright yellow
Disk flowers many; corollas 3 mm
Fruit 3–4 mm, cylindric, distinctly angled; ribs of angles most prominent
Chromosomes: 2n=32
Ecology: Desert roadsides, sandy soils
Elevation: < 1500 m.
Bioregional distribution: East of Sierra Nevada, Desert
Distribution outside California: to Utah, Arizona, n Mexico
Flowering time: Mar–Jun, Oct–Nov
Horticultural information: TRY.

previous taxon | next taxon
bioregional map for BAILEYA%20pleniradiata being generated

Retrieve Jepson Interchange Index to Plant Names entry for Baileya pleniradiata
Retrieve dichotomous key for Baileya
Retrieve multiple-entry key (MEKA) for Baileya
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

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