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1. Calendula arvensis Linnaeus, Sp. Pl. Ed. 2,. 2: 1303. 1763.
Leaf blades (1–)3–8(–10+) cm × 4–15(–20+) mm. Peduncles 3–5 cm. Phyllaries 13–21+, 6–10+ mm. Ray florets 13–18+; corolla laminae 5–8(–12+) mm. Disc florets 20–30+; corollas 2.5–4 mm. Cypselae 3–12(–25+) mm. 2n = 44 (18 and 36 have been reported).
Flowering Feb–Apr. Disturbed places; 0–200 m; introduced; Calif.; Eurasia; Africa; Atlantic Islands.
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