Isotoma hypocrateriformis, commonly known as Woodbridge poison, is a small herbaceous perennial in the family Campanulaceae native to Western Australia.

The erect, succulent and annual plant typically grows to a height of 0.08 to 0.6 metres (0.3 to 2.0 ft). It blooms between September and January producing white-blue-purple-pink flowers.

It is found in a variety of habitats in the South West, Wheatbelt and Great Southern regions of Western Australia where it grows in sandy soils around granite.

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