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Key to families | Table of families and genera
Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.
Annual, perennial herb. Stem: erect; branches ascending. Leaf: basal and alternate, simple, sessile or petioled, entire or dentate, 3-veined from base. Inflorescence: heads radiate or discoid, 1 or in few- to many-headed cyme-like or panicle-like cluster; peduncle ± elongated; involucre hemispheric; phyllaries ± equal or weakly graduated in 2–3 series, free, green; receptacle paleate, palea folded around and falling with fruit. Ray flower: 0 or 10–21, sterile; style 0; ray yellow. Disk flower: many; corolla 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.
2 species: southwestern United States, northwestern Mexico. (Greek: old, from white-haired involucre) [Clark 2006 FNANM 21:122]
1. Rays present; annual from taproot; leaves sessile or tapered to winged petiole, ± canescent, bases not ear-like; phyllaries acute, ciliate ..... G. canescens
1' Rays 0; perennial herb from an underground caudex; leaves sessile, glandular-puberulent, bases ear-like; phyllaries obtuse, glandular ..... G. viscida
Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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