[Wikipedia] Etymology: 'Brassica' was Pliny the Elder's name for several cabbage-like plants. Its specific epithet oleracea means "vegetable/herbal" in Latin and is a form of holeraceus (oleraceus). (link added by Mary Ann Machi)
Calflora:
Information on California plants for education, research and conservation,
with data contributed by
public and private institutions and individuals.
[web application]. 2025.The Calflora Database
[a non-profit organization].Available:
https://www.calflora.org/(Accessed: 03/28/2025).