Lewis & Short

Stoechădĕs insulae, = Στοιχάδες, a group of islands on the southern coast of Gaul, near Massilia, now Isles d’Hyères, Plin. 3, 5, 11, § 79; Schol. Cic. Sest. p. 293 Orell.
Hence, stoechăs, ădis, f. (sc. herba), French lavender, sticados: Lavandula Stoechas, Linn.; Plin. 27, 12, 107, § 131; 26, 7, 27, § 42.