Jepson eFlora: Key page
Vascular Plants of California
Key to families | Table of families and genera

Key to Carduus

View taxon page for Carduus

(For a list of species in Carduus, use the above link.)

Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

1. Phyllaries generally > 2 mm wide; heads generally solitary, conspicuously peduncled;  2–7 cm diam ..... C. nutans

1' Phyllaries generally <= 2 mm wide; heads 1–several, often clustered at branch tips, short-peduncled or ; involucre 1–3 cm diam

2. Involucre ± spheric or hemispheric ..... C. acanthoides subsp. acanthoides

2' Involucre  or narrowly ellipsoid

3. Heads generally 2–5 per cluster; phyllaries not scarious-margined, bases ± persistently loosely , tips scabrous ..... C. pycnocephalus subsp. pycnocephalus

3' Heads 5–20 per cluster; phyllaries scarious-margined, bases glabrous to sparsely tomentose, tips glabrous or barely scabrous, sometimes minutely scabrous-ciliate ..... C. tenuiflorus



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

Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on .

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