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Scientific name: Carduus pycnocephalus subsp. Pycnocephalus

Family: Asteraceae or Sunflower

Tribe: Cynareae

Genus: excl. Cirsium

Blooms: Mar–July

Plant Height: 0.2–2 m

Origin: Mediterranean

Habitat: Roadsides, pastures, disturbed places

About: Flower heads are fairly small (10–14 mm across) and in groups of 1–5, typically 3. Both leaves and stems are extremely prickly. Locally, this can be highly invasive and hard to eradicate.

https://montereywildflowers.com/asteraceae-thistle-misc/