Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit 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.

GERAEA

Curtis Clark

Annual, perennial herb
Stems erect; branches ascending
Leaves basal and alternate, simple, sessile or petioled, entire or toothed, 3-veined from base
Inflorescence: heads radiate or discoid, solitary or in few-headed panicles; peduncles ± elongated; 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, tube slender, throat gradually expanded, lobes triangular; anther tips ovate, ± acute; style tips triangular
Fruit strongly compressed, narrowly wedge-shaped; edges ± white, long-ciliate; faces black, ± hairy; pappus of 2 narrow awns
Species in genus: 2 species: sw US, nw Mex
Etymology: (Greek: old, from white-haired involucre)

Native

G. viscida (A. Gray) S.F. Blake

STICKY GERAEA

Perennial from underground caudex; herbage densely glandular-puberulent and ± bristly
Stems several from caudex, 3–10 dm, simple or few-branched
Leaves 3–9 cm, sessile; blade ovate to oblong, green, tip obtuse, base with ear-like basal lobes, margin entire or dentate
Inflorescence: heads discoid, solitary or several in ± flat-topped clusters; involucre 10–15 mm; phyllaries narrowly lance-oblong, obtuse, green, densely glandular
Ray flowers 0
Disk flowers: corollas 6–8 mm
Fruit 7–10 mm; pappus awns 3–5 mm
Chromosomes: 2n=36
Ecology: Openings in chaparral
Elevation: 450–1700 m.
Bioregional distribution: s Peninsular Ranges (s San Diego Co.)
Distribution outside California: nw Baja California
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for GERAEA%20viscida being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Geraea viscida
Retrieve dichotomous key for Geraea
Retrieve multiple-entry key (MEKA) for Geraea
Overlay Consortium of California Herbaria specimen data by county on this map
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