| 1. Flowers purple; phyllaries > flowers |
| T. porrifolius |
| 1' Flowers pale to bright yellow; phyllaries < to >> flowers |
| |
| 2. Peduncles much wider toward tip; phyllaries >> pale yellow flowers |
| T. dubius |
| 2' Peduncles not or little wider toward tip; phyllaries < bright yellow flowers |
| T. pratensis
|