Toyoshima’s Thistle (Cirsium toyoshimae)

Toyoshima’s Thistle was probably endemic to the island of Chichijima in the Ogasawara Islands, Japan, and appears to be known exclusively from herbarium sheets.

The plant had a basic rosette of larger oak leaf-like shaped leaves, the flowers were about 2 to 2,5 cm in diameter and appear to have been yellowish.

The species was never seen since 1936 and is almost certainly extinct. [1]

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References:

[1] Tetsuto Abe; Katsuyuki Wada; Nobukazu Nakagoshi: Extinction threats of a narrowly endemic shrub, Stachyurus macrocarpus (Stachyuraceae) in the Ogasawara Islands. Plant Ecology 198: 169-183. 2008

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edited: 14.01.2019