O. onites	O. × karpathicum	O. vetteri
Stems	20‒100 cm tall, branches of first and second order present, third order sometimes present, hirsute and glandular pilose	9‒15 cm tall, branches of -first order present or not sparsely to densely pilose with glandular papillae	2‒10 cm tall, branches of first order usually absent, lanate-pilose
Leaves	3‒22 × 2‒19 mm, ovate, acute or acuminate at apex, remotely serrulate, margins flat, hirsute	5‒12 × 4‒8 mm, broadly ovate to rounded, obtuse at apex, entire, margins flat or sometimes slightly revolute, densely pilose with minutely glandular papillae	2‒8 × 1‒5 mm, ovate or deltoid, obtuse at apex, entire, margins revolute, lanate-pilose
Inflorescence	erect, corymbose	erect, corymbose or not, sometimes slightly nodding	unbranched, slightly nodding
Bracts	2.5‒3 × 1.7‒2.2 mm, ovate, oval or obovate, acute to acuminate or obtuse at apex, light green	3-5 × 2-3.2 mm, elliptic to obovate, acute to acuminate at apex, green to purplish,	5‒7 × 2.5‒4 mm, obovate to oval, acute to acuminate at apex, partly purplish
Calyx	2‒2.5 mm long, 1-lipped for 9/10, upper lip entire or denticulate	3.5‒4 mm long, 2-lipped, upper lip entire to 3-toothed, lower lip 2- toothed	4‒5 mm long, 2-lipped, upper and lower teeth well developed
Corolla	3.5‒4 mm long, white	3.5‒5 mm long, white	5‒6 mm long, pink
Stamens	4 or 0, if 4, protruding	4, immature, included in corolla	4, all stamens clearly exserted from corolla