Key to the species of Tricyrtis in Taiwan

1. Bulbs in chains, spur unlobed........................................................................................................................................... 5. T. suzukii

- Bulbs single, spur bilobed .................................................................................................................................................................. 2

2. Spur apex orbicular, capsule septicidal dehiscent .............................................................................................................................. 3

- Spur apex oblong, capsule transverse dehiscent................................................................................................................................. 4

3. Evergreen, spur velutinous, 4.0– 4.2 mm long, pedicels velutinous ........................................................................... 1. T. formosana

- Deciduous, spur glandular, 2.0– 2.9 mm long, pedicels glandular.................................................................................... 4. T. ravenii

4. Stem 125.0–150.0 cm long, mature leaves 25.0–30.0 × 10.0–15.0 cm, capsule falling at maturity, bulbils developing at the nodes of aerial stem ..................................................................................................................................................... 3. T. lingyunyanensis

- Stem 20.0–100.0 cm long, mature leaves 9.0–20.0 × 6.0– 8.5 cm, capsule retained, no bulbils developing at the nodes of aerial stem..................................................................................................................................................................................................... 5

5. Leaves lanceolate-oblanceolate....................................................................................................... 2a. T. lasiocarpa var. lasiocarpa

- Leaves ovate-oblong......................................................................................................................... 2b. T. lasiocarpa var. ovatifolia