| |
| 2. Corolla tube 914 mm; inflorescence hairs 23 mm, obscuring pedicels |
| T. lanatum |
| 2' Corolla tube 47 mm; inflorescence hairs 12 mm, not obscuring pedicels |
| T. parishii |
| |
| 3. Petiole distinct, 515 mm |
| |
| 4. Corolla tube 48 mm, exserted, lower lip 47 mm |
| T. laxum |
| 4' Corolla tube 1.53 mm, included, lower lip 23 mm |
| T. simulatum |
| 3' Petiole indistinct or < 5 mm |
| |
| 5. Stamens 1020 mm; corolla tube curved abruptly upward near throat |
| |
| 6. Leaf blade 27 cm, lanceolate to narrowly ovate, length > 3 × width; corolla tube 510 mm |
| T. lanceolatum |
| 6' Leaf blade 12 cm, ovate, length < 2 × width; corolla tube 2.55.5 mm |
| T. ovatum |
| 5' Stamens 26 mm; corolla tube curved gradually upward |
| |
| 7. Hairs on stem and leaves curled or appressed; stamens 23 mm, ± included or barely exserted |
| T. micranthum |
| 7' Hairs on stem and leaves straight, spreading; stamens 36 mm, exserted |
| |
| 8. Calyx lobes < 2 × tube; calyx tube > mature nutlets; mature calyx generally red-tinged |
| T. rubisepalum |
| 8' Calyx lobes > 2 × tube; calyx tube < mature nutlets; mature calyx green |
| |
| 9. Leaf blade widely elliptic, length generally < 4 × width; calyx lobes generally widest above base |
| T. oblongum |
| 9' Leaf blade elliptic, length generally > 4 × width; calyx lobes widest at base |
| T. austromontanum |
| 10. Leaf ± = or < internode above |
| subsp. austromontanum |
| 10' Leaf >> internode above |
| subsp. compactum
|