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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.


Subshrub; hairs barbed. Leaf: linear to ± round, entire to toothed; base tapered to cordate. Inflorescence: raceme, generally terminal; bracts 3 per flower, outer 1 > inner 2. Flower: sepals ± deciduous; petals free or claws adherent, fused below blades; stamens generally 5, free; ovary ± ovoid, placenta 1, stigma 1. Fruit: achene, ± ovoid, generally 5-veined or -ribbed, erect. Seed: 1, 1.5–2.5 mm, ± fusiform, generally smooth.
5 species: southwestern United States, northwestern Mexico. (Greek: petal claw) [Davis & Thompson 1967 Madroño 19:1–32]

Key to Petalonyx

1. Petals free; leaves linear to narrowly (ob)lanceolate ..... P. linearis

1' Petal claws adherent, ± tubular; leaves lanceolate to widely ovate

2. Leaves petioled, cauline ± equal ..... P. nitidus

2' Leaves sessile, cauline reduced upwards ..... P. thurberi

3. Hairs soft, spreading; stamens 4–7.5 mm ..... subsp. gilmanii

3' Hairs rough, appressed downward; stamens 6–10 mm ..... subsp. thurberi


Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, [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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