buttons

genus Cotula

Member of 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.

brass buttons
Cotula coronopifolia

brass buttons
Cotula coronopifolia

glabrous, ± fleshy
leaf blade entire or irregularly toothed or lobed
corolla bright yellow, 1–1.5 mm
common

australian cotula
Cotula australis

minutely strigose to long-soft-hairy
leaf blade 2–3-pinnately divided
corolla dull white to pale yellow, 0.5–0.8 mm
scattered

1 observed taxon / 1 unobserved taxon / 1 key

Chris’s observations: 2 (all are research grade)

Locations:

Coyote Hills RP: 2

Months:

Apr.: 1
May: 0
Jun.: 0
Jul.: 1

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Taxon info: iNaturalist – Calflora – Jepson eFlora – FNA

Bay Area species: iNaturalist – Calflora