| 1 | Stems and leaves hairy |
| 1' | Stems and leaves glabrous, glaucous |
| 2 | Calyx-lobes united almost to apex; nutlet 1, enclosed in the calyx and falling with it, 3 x 2.5 mm |
| 2' | Calyx-lobes free almost to base; nutlets 4, falling out of the persistent calyx when ripe, c. 1.5 x 1 mm |
| 3 | Corolla with 5 linear of filiform internal scales, limb 4-6 mm diam.; calyx-lobes c. 3.5 mm long; stem clothed with short, subadpressed and long, spreading hairs |
| 3' | Corolla without internal scales, limb 2-3.5 mm diam.; calyx-lobes c. 2.5 mm long; stem clothed with short, subadpressed hairs |
| 4 | Calyx clothed with long, spreading, shaggy hairs, lobes becoming patent soon after anthesis; anthers broadly lanceolate, c. 1 mm long; stigmatic cone produced into a long, subulate-filiform acumen |
| 4' | Calyx clothed with subadpressed, upward-pointing hairs hairs, lobes remaining erect and embracing the nutlets, not becoming patent until the nutlets have shed; anthers narrowly lanceolate, c. 1.5 mm long; stigmatic cone sometimes narrowly conical, but not produced into a subulate-filiform acumen |
