Alyssum cassium Boiss., Diagn. Pl. Orient. 8: 34. 1849.

 Odontarrhena cassia (Boiss.) Španiel et al. in Pl. Syst. Evol. 301: 2484. 2015.

Type: “[Boissier] Hab. in agris derelictis et collibus ad radices jugi Cassii in latere meridionali cum praecedenti [ A. crenulatum] mixtum”.

Holotypus: TURKEY: “Syria. Bas de la chaîne du Cassius venant de Latakieh”, V–VII.1846, Boissier s.n. (G-BOIS [G00332362]; iso-: BR [BR0000006993368], CAS [CAS0026904], E [E00373077], G [G00446158, G00446159, G00446160], GH [GH00018473], GOET [GOET 002678, GOET 002679], HBG [HBG505891], K [K000484903, K000484904], P [P02272242, P02272244, P02272246, P02272248, P02272249, P04708402], PH [PH00002542], W [W0072045, W18890016458, W19380001461]) .

Notes. – The holotype is a collection folder of seven sheets. The label of one has Boissier’s handwriting of the species name in red ink and locality in black ink and the print “Syria, MaiJul. 1846. E. Boissier”. The locality data on the other six sheets is rather brief. Although the locality was originally belived in Syria, it is currently in Turkey near Latakia City.

The isotypes have a printed label in Boissier’s handwriting “Syria ad radices Mtis Cassii Jun 1846. E. Boissier”.