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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.

 

LEUCANTHEMUM

Bruce G. Baldwin, adapted from Strother (2006)


Perennial herb, from rhizome, 10–120(200+) cm; roots generally red-tipped. Stem: erect, simple or distally branched, glabrous or hairy. Leaf: basal and cauline, alternate; basal petioled, cauline petioled or sessile; blade linear or lanceolate to obovate, entire to 1[2+]-pinnately lobed or toothed, glabrous or sparsely hairy. Inflorescence: heads generally radiate (discoid), 1 or in 2–3s; involucre hemispheric or broader; phyllaries 35–60+ in 3–4+ series, free, ± ovate to oblanceolate, unequal, glabrous or sparsely hairy, margins scarious, colorless to ± brown; receptacle convex, epaleate, glabrous. Ray flower: generally 13–34+ (0); corolla white, drying ± pink, ray linear to ovate. Disk flower: 120–200+; corolla yellow, tube ± cylindric, proximally swollen, throat bell-shaped, lobes deltate, resin sacs 0; anther tip triangular-ovate; style tips truncate, papillate. Fruit: ± columnar to obovoid, generally 10-ribbed, glabrous; pappus 0 or fruit wall crown-like at fruit tip.
20–40+ species: Europe, northern Africa. (Greek: white flower) [Strother 2006 FNANM 19: 557–559]
Unabridged references: [Vogt 1991 Ruizia 10:1–261]

Key to Leucanthemum

1. Basal leaves generally pinnately 3–7+ lobed and/or irregularly toothed; mid-stem leaves generally irregularly toothed throughout ..... L. vulgare

1' Basal leaves not lobed, generally toothed (entire); mid-stem leaves generally proximally entire, distally regularly serrate

2. Larger phyllaries 3–5 mm wide; ray fruit 3–4 mm, tip adaxially generally with ear-like projections; cauline leaf blades 3–12+ cm, 12–25(35+) mm wide, elliptic to oblanceolate ..... L. lacustre

2' Larger phyllaries 2–3 mm wide; ray fruit 2–3(4) mm, tip generally entire (adaxially with ear-like projections); cauline leaf blades 5–12+ cm, 8–22+ mm wide, oblanceolate to lanceolate or linear ..... L. maximum

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [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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