Hawkesbury Pigweed (Trianthema cypseloides)
This species is only known from the type material that was collected from the Hawkesbury River in New South Wales, Australia
This was a small, creeping, ground-dwelling herb with short branches and egg-shaped, about 0,5 cm long, slightly succulent leaves and flowers appearing in loose, flat-topped clusters.
The reasons for the extinction of this species are not known.
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The photo below shows another congeneric species from Australia, the Star Pigweed (Trianthema oxycalyptrum F.Muell.)
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edited: 25.01.2024