Sideritis clandestina, (Bory & Chaub.) Hayek

22. S. clandestina (Bory & Chaub.) Hayek , Prodr. FI. Penins. Balcan. 2: 257 (1929).

Yellowish- or grey-lanate perennial 1540 cm. Lower leaves 25-50 x 8-20 mm, oblong-spathulate to obovate, entire or crenulate; middle and upper leaves 30-70 x 6-12 mm, linear to oblong-elliptical, entire. Verticillasters 4-20, many-flowered, crowded or the lower 1-3 distant. Middle bracts 15-25 mm (including acumen), exceeding the flowers, broadly ovate to suborbicular; acumen 4-10 mm, sparsely or densely lanate. Calyx 9-11 mm; teeth 3 -54- 5 mm, slightly shorter than tube. Corolla 10-15 mm, yellow. Mountain rocks. • S. Greece (Peloponnisos). Gr.

Plants from Tai'yetos ( var. clandestina ) have a grey indumentum, linear to linear-oblong middle and upper leaves, 10-20 verticillasters with the uppermost crowded, and densely lanate bracts with acumen 6-10 mm. Those from Killini ( var. cyllenea (Heldr. ex Boiss.) Hayek ) have a yellowish indumentum, oblong-elliptical middle and upper leaves, 4-10 distant verticillasters and sparsely lanate bracts with acumen 4-6 mm. The latter are more or less intermediate between var. clandestina and 23.