köken: From portula (“little door”), from porta (“door”) + -ula (“diminutive suffix”), + -āca, apparently because of the door-like opening of the seed capsule. For the ending, compare pastināca, verbēnāca.
Borrowed on the verge of Middle High German to Early New High German from Latin portulaca (in herbals which hardly transmitted the length of the penultimate vowel). Largely displaced the earlier borrowing Burzel.