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
Tag Archives: Cirsium
Cirsium praeteriens J. F. Macbr.
Palo Alto Thistle (Cirsium praeteriens)
The Palo Alto Thistle was described in 1918, it is known only from two collections from 1897 and 1901 respectively.
The species resembles the probably closely related Franciscan Thistle (Cirsium andrewsii (A. Gray) Petr.) but differs from that species in having long involucral spines.
The Palo Alto Thistle was not found since the beginning of the 20th century and is considered extinct.
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edited: 14.01.2019