| 1 | Leaves linear; lower lip of corolla ca. 5 times as long as upper lip |
| 1' | Leaves relatively broader; lower lip of corolla not more than 2½ times as long as upper lip |
| 2 | Leaves either all or at least lower ones petiolate; blades oblong, ovate or rhomboid and secondary veins in 6-7 pairs |
| 2' | Leaves all subsessile; blades ovate or ovate-elliptic and then with secondary veins in 4-5 pairs, or lanceolate with 5-6 pairs of secondary veins |
| 3 | Inflorescence capitate, usually 5-flowered; bracteoles and calyx lobes eglandular |
| 3' | Inflorescence spicate, flowers more numerous; bracteoles and calyx lobes glandular |
| 4 | Leaf blade lanceolate; bracts narrowly linear |
| 4' | Leaf blades ovate or ovate-elliptic; bracts linear-lanceolate |
| 5 | Leaf blade acute at base; bracts and bracteoles 3-veined; bracteoles and calyx lobes glandular |
| 5' | Leaf blade rounded at base; bracts and bracteoles 1-veined; bracteoles and calyx lobes eglandular |
