genus Leucanthemum

Member of white daisies
sunflower family (family Asteraceae)
dicots (class Magnoliopsida)
flowering plants (subphylum Angiospermae)

Except for historical records that I'm ignoring, there are no other wild species of this genus in the bay area.

oxeye daisy
Leucanthemum vulgare

basal leaves generally pinnately 3–7+ lobed or irregularly toothed, petiole 30–60+ mm
mid-stem leaves generally irregularly toothed throughout
ray flowers: 13–34+, 12–20(35+) mm

shasta daisy
Leucanthemum maximum

basal leaves not lobed, generally toothed (entire), petiole 10–30(120) mm
mid-stem leaves generally proximally entire, distally regularly serrate
ray flowers: 21–34+, 20–25(35) mm

Toxicity of bridesmaid, chrysanthemum, daisy, mum, shasta daisy, spider mum, tansy (Chrysanthemum spp.):
1 – Skin contact with these plants can cause symptoms ranging from redness, itching, and rash to painful blisters like skin burns.
3 – Ingestion of these plants is expected to cause nausea, vomiting, diarrhea and other symptoms that may cause illness but is not life-threatening.

2 observed taxons / 1 key

Chris’s observations: 11 (3 are research grade)

Locations:

Sweeney Ridge National Recreation Area: 4
Butano SP: 2
El Corte de Madera OSP: 2
Skyline Ridge OSP: 2
Andrew Molera SP

Months:

Mar.: 1
Apr.: 0
May: 0
Jun.: 5
Jul.: 2
Aug.: 3

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Taxon info: iNaturalist – Calflora – Jepson eFlora – FNA

Bay Area species: iNaturalist – Calflora