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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, spiny; sap yellow, orange, or white. Leaf: generally cauline, ovate to oblanceolate, toothed or deeply pinnate-lobed, prickly. Inflorescence: terminal, 1-flowered. Flower: sepals (2)3, prickly, with pointed appendage below tip, shed at flower; petals (4)6, free, obovate to obdeltate, crinkled, white, shed after flower; stamens 100–250, free; carpels 3–5, style 0 or 1, stigma lobes 3–5. Fruit: ovate to lanceolate, prickly, dehiscent from top by slits. Seed: many, 1–2.5 mm, round to ovate, net-ridged, brown or black.
± 30 species: North America, South America, Hawaii. (Greek: a poppy-like plant mentioned by Pliny)

Key to Argemone

1. Sap orange; leaf generally less prickly adaxially; stamens 100–120; fruit 25–35 mm; seed 1.5–2 mm; East of Sierra Nevada, Mojave Desert ..... A. corymbosa

1' Sap generally yellow (red in High North Coast Ranges); leaf ± equally prickly adaxially, abaxially; stamens 150–250; fruit 35–55 mm; seed 2–2.5 mm; Northwestern California (except North Coast), Central Western California, Southwestern California, s Sierra Nevada, Great Basin Floristic Province, Desert ..... A. munita


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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