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Leucanthemum maximum (Ramond) de Candolle [family COMPOSITAE]

Date Updated: 23 July 2012

Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 19,
Names
Leucanthemum maximum (Ramond) de Candolle [family COMPOSITAE], in A. P. de Candolle and A. L. P. P. de Candolle, Prodr., 6: 46. 1838 Chrysanthemum maximum Ramond [family COMPOSITAE], Bull. Sci. Soc. Philom. Paris, 2: 140. 1800
Treatment Author(s)
John L. Strother
Information
Perennials, 20–60(–80+) cm. Stems simple or distally branched. Basal leaves: petioles 50–80(–200+) mm, expanding into obovate to spatulate blades 50–80(–120+) × 15–25(–35+) mm, margins not lobed, usually toothed, rarely entire. Cauline leaves petiolate or sessile; blades oblanceolate to lanceolate or linear, 50–120+ × 8–22+ mm, margins of mid-stem leaves usually entire proximally, regularly serrate distally. Involucres 18–28+ mm diam. Phyllaries (the larger) 2–3 mm wide. Ray florets 21–34+; laminae 20–30(–40+) mm. Ray cypselae 2–3(–4) mm, apices usually bare, rarely obscurely auriculate. 2n = 90, 108.
Phenology
mar-may (spring), jun-aug (summer)
Altitude range
0–1500+ m;
Distribution
w Europe (widely cultivated).w Europe (sparingly adventive).USA Ala.USA Calif.USA Wyo.
Discussion
The name Shasta daisy of horticulture is associated also with Leucanthemum ×superbum (Bergmans ex J. Ingram) Bergmans ex D. H. Kent, which is generally thought to have been derived from hybrids between L. maximum and L. lacustre. Cultivars of “Shasta daisy” number in the dozens, including “single,” “double,” “quill,” and “shaggy” forms; they may be encountered as waifs or persisting from abandoned plantings.
Native/Introduced
introduced;
Leucanthemum maximum (Ramond) de Candolle [family COMPOSITAE]
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