| 1 | Leaves usually overlapping, imbricate; flowering stems with resting buds at base |
| 1' | Leaves rarely overlapping, majority of internodes longer than leaves; flowering stems without resting buds at base |
| 2 | Stems subadpressed-pubescent with retrorsely curved, white hairs |
| 2' | Stems clothed with very short spreading hairs, generally intermixed with much longer, spreading hairs |
| 3 | Flowers distinctly pedicellate; bracteoles about as long as pedicels; calyx villous with long white hairs |
| 3' | Flowers subsessile, forming compact, crowded verticillasters; bracteoles much longer than pedicels; calyx shortly pubescent |
| 4 | Flowers distinctly pedicellate; bracteoles about as long as pedicels, nutlets ovoid-oblong, c. 0.7 x 0.4 mm |
| 4' | Flowers subsessile; bracteoles much exceeding the very short pedicels; nutlets oblong, ca. 1 x 0.4 mm |
