Key to the groups

Group 1. Corolla yellow or orange

Group 2. Inflorescence compact, spike-like; flowers sessile; calyx lobes subulate, spinescent

Group 3. Inflorescence dense, spiciform, cylindrical; corolla violet, purplish or blue

Group 4. Inflorescence lax with the axis conspicuous between most of the single flowered cymes; flowers solitary; corolla violet, purplish or blue

Group 5. Calyx with two lower lobes fused

Group 6. Corolla blue, purple, mauve, pink or white, not yellow; inflorescence lax at least in lower half, the axis conspicuous between most of the cymes; if condensed, then only in upper half or globose, not a dense conical spike; flowers pedicellate; calyx with upper lobe narrowly triangular, ovate to obovate, often broader and differing in shape and size from lower four lobes, lobes not all subulate and spinescent; lower calyx lobes free, not fused into a lip; cymes of two flowers or more