TREATMENT FROM THE JEPSON MANUAL	previous taxon | next taxon Jepson Interchange (more information)
	©Copyright 1993 by the Regents of the University of California Print edition is available from the University of California Press

	The second edition of The Jepson Manual (2012) is available from the University of California Press
	See also the Jepson eFlora, which parallels the Second Edition

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.

RAILLARDELLA

Bruce G. Baldwin

Perennial, ± scapose from generally branched rhizome; rosettes often clumped
Leaves simple, sessile, ± basal
Inflorescence glandular, sometimes hairy; heads radiate or discoid, generally solitary; phyllaries generally as many as ray flowers, ± folded around ray ovaries; chaff scales in 1 involucre-like series, ± equal, ciliate-hairy
Ray flowers 0–13; corollas yellow to red; ligules often deeply lobed
Disk flowers 7–84; corollas yellow to red; style branches long, tips bristly
Fruit ± cylindric, ± straight, ascending-hairy, black; pappus of flat, ciliate-plumose bristles
Species in genus: 3 species: montane CA, w NV, OR
Etymology: (Latin: small Raillardia or Railliardia )
Reference: [Baldwin et al. 1991 Proc Natl Acad Sci. USA 88:1840–1843]

Native

R. argentea (A. Gray) A. Gray

SILKY RAILLARDELLA

Plant 1–14.5 cm
Leaves basal, entire, 0.7–8 cm, generally oblanceolate, silky-hairy, minutely glandular or nonglandular
Inflorescence: heads discoid, solitary, cylindric to bell-shaped; peduncles 0.1–12.5 cm, subtending bracts 0–1; phyllaries 0; chaff scales 5–15, 6–16 mm, ± fused
Ray flowers 0
Disk flowers 7–26; corollas 6–11 mm, yellow
Fruit 5–9.5 mm, ± linear; pappus bristles 16–30, 6–11 mm
Chromosomes: 2n=34,36
Ecology: Dry, open, generally gravelly sites
Elevation: 2200–3900 m.
Bioregional distribution: Klamath Ranges, High Cascade Range, High Sierra Nevada, San Bernardino Mountains, Warner Mountains, East of Sierra Nevada
Distribution outside California: w Nevada, Oregon
Flowering time: Jul–Aug
Interfertile with R. pringlei
Horticultural information: DRN, IRR, SUN: 1, 2, 3, 6, 7, 15, 16, 18; DFCLT.