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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 or perennial herb
Stems generally erect
Leaves opposite or alternate, generally reduced upward, often 3-veined from near base, generally rough-hairy
Inflorescence: heads radiate, solitary or in cymes; involucre bell-shaped to hemispheric; phyllaries in 1–3 generally ± equal series, free; receptacle flat to rounded; chaff scales 0–3-lobed
Ray flowers 10–many, sterile; ligules yellow
Disk flowers many; corollas yellow to red or purple, tube short, throat base often swollen, lobes triangular; style appendages triangular
Fruit oblanceolate to obovate, ± compressed; sides rounded; pappus generally of 2 deciduous, lanceolate to ovate scales (sometimes also 1–several shorter scales)
Species in genus: 67 species: Am
Etymology: (Greek: sun flower)
Reference: [Heiser 1969 Mem Torrey Bot Club 22(3):1–218]


H. bolanderi A. Gray

Annual < 1.5 m
Stems rough-hairy
Leaves petioled; blades 3–15 cm, narrowly lanceolate to ovate, base truncate to wedge-shaped, tip generally acute, margin entire to serrate
Inflorescence: heads 1–several; peduncles 3–13 cm; involucre 1.5–2.5 cm diam; phyllaries 8–25 mm, oblong to lanceolate, long-acuminate, generally >> disk, hairs long, soft to stiff; chaff scales 3-toothed, awn-tipped, >> disk flowers, tip glabrous
Ray flowers 10–17; ligules 1–2 cm
Disk flowers: corollas 4–6 mm, lobes yellow or red-purple
Fruit 3–4.5 mm; pappus scales 2–3 mm
Chromosomes: 2n=34
Ecology: Grassy, often disturbed places
Elevation: generally < 1200 m.
Bioregional distribution: Klamath Ranges, North Coast Ranges, Cascade Range, Sierra Nevada Foothills, Great Central Valley, San Francisco Bay Area, South Coast Ranges
Distribution outside California: s Oregon
Slender plants on serpentine have been called H. exilis A. Gray, serpentine sunflower
Horticultural information: SUN, DRN: 4, 5, 6, 17 &IRR: 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22, 23, 24.

Information on Distribution was contributed by Tom Cochrane (13 May 2004):
Helianthus bolanderi... is known at Santa Teresa co. park in S. San Jose

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