Annual to perennial herbaceous plants or small shrubs of the labiate family with gray hairy stem leaves, lip-shaped, usually yellow flowers. Distinguished are 4 different limbworts:
Balkan limbwort, Greek vervain - Sideritis scardica Griseb.
Syrian limbwort - Sideritis syriaca L.
(Hidden?) limbwort - Sideritis clandestina (Bory & Chaub.) HayekParnassian
(?) limbwort - Sideritis raeseri Boiss. & Heldr.
Phytotherapeutically, the dried stems and leaves (Sideritis herba, Greek mountain tea - Sideritis herba) are used. No pharmacopoeia quality description.