Cirsium × stiriacum (Cirsium greimleri × rivulare) is a hybrid between C. greimleri and C. rivulare.

It is a rare hybrid, known from only 4 herbarium specimens as of 2020.

Distribution

It is found only in the Lavanttal Alps and Karawanks.

Description

The type specimen was more similar to C. greimleri than to C. rivulare, but bore pinnately divided leaves, too thinly webbed on the underside for pure C. greimleri.

The description of Reichenbach:

Taxonomy

Identified on 29 June 1903 by Karl Fritsch in the Lassnitz valley. Although earlier authors believed it had been found by Tommasini on Snežnik, that record was doubted by subsequent authors.Wraber 1998.

See also List of Cirsium species

References Text of Public Domain references available in article code.

Further reading