Zygophyllum stapffii, synonym Tetraena stapffii, (Afrikaans: daalderplant, English: dollar bush) is a species of flowering bush endemic to Namibia.

[1] As of January 2025[update], the specific epithet was sometimes spelt with a single f, i.e. stapfii,[2] but the International Plant Names Index spells it with double f.[3] It grows in the Namib ecoregion along the Atlantic Ocean coast.

Most of this plant's moisture comes from the morning mist.

The shrub's round, coin-like leaves lend it its colloquial name: daalder is an old Dutch coin worth one and a half guilders.

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