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Leucanthemum lacustre (Brot.) Samp.  
Family: Asteraceae
Portuguese Daisy
Leucanthemum lacustre image
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John L. Strother in Flora of North America (vol. 19, 20 and 21)
Perennials, 30-120(-200+) cm. Stems simple or distally branched. Basal leaves: petioles 30-60+ mm, expanding into lanceolate blades 50-100+ × 15-30+ mm, margins not lobed, usually toothed, sometimes entire. Cauline leaves ± petiolate or sessile; blades elliptic to oblanceolate, 30-120+ × 12-25(-35+) mm, margins of mid-stem leaves usually entire proximally, regularly serrate distally. Involucres (18-)25-35 mm diam. Phyllaries (the larger) 3-5 mm wide. Ray florets 21-34+; laminae 20-25(-35) mm. Ray cypselae 3-4 mm, apices usually auriculate adaxially. 2n = 198. Flowering spring-summer. Disturbed places, meadows, seeps, clearings; 0-50 m; introduced; Calif.; Europe (Portugal).
Leucanthemum lacustre
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The National Science Foundation
Development supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)
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