Alyssum montanum var. hymettium Boiss., Fl. Orient. 1: 274. 1867.

Type: “Hab. in Graeciae monte Hymetto (Auch. exs. 276! Spr.!), Parnasso (Heldr!)”.

Lectotypus (designated by ŠPANIEL et al., 2017: 1438): GREECE: “in Mte Hymetto”, s.d., Aucher-Eloy 276 (G-BOIS [G00332365]; isolecto-: BM [BM000750107], G [G00388918, G00446161, G00446162], K [K000484576], P [P05426246, P05426263, P05426422]) . Syntypi: GREECE: “In monte Parnasso. reg. alpina”, 11.VIII.1852, Heldreich s.n. (G-BOIS [G00332366], WU [WU0076265]) ; “Gipsel d‘Hymetteri”, s.d., Spruner s.n. (G-BOIS [G00332367]) .

= Alyssum montanum L., Sp. Pl.: 650. 1753.

Notes. – Alyssum montanum is the most variable species in the genus, and numerous infraspecific taxa at various ranks have been recognized.

HARTVIG (2002: 210) accepted var. hymettium solely on morphological grounds within Greece, but without extensive population-based and detailed morphological and molecular studies. It is then advisable to reduce the variety to synonymy within subsp. montanum, as done in BRASSIBASE (2019).