Clastopus purpureus Bunge ex Boiss., Fl. Orient. 1: 261. 1867.

Type: “Hab. in Persiâ mediâ occidentali inter Ssof et Kohrud (Bunge!)”.

Holotypus: IRAN: “Inter Ssof & Kohrud”, 14.V.1859, Bunge s.n. (G-BOIS [G00791307]; iso-: K [K000484514, K000484515], LE [LE00013037, LE00013038], P [P02272117, P02272118, P02272119]) .

Notes. – Except for P 02272119, which has a handwritten label by Bunge with the exact locality and date, all isotypes have printed labels that read “Iter persicum. inter Isfahan et Teheran. Maj. 1859”. The G-BOIS holotype has the printed label, as well as Bunge’s handwritten label in pencil of the exact locality but without the day of collection.

The species was transferred by BORNMÜLLER (1906) to the monospecific Straussiella and remained there for more than a century. However, it is recently retained by ŠPANIEL et al. (2015) in Clastopus based on molecular data and a closer reexamination of morphology.