Clematis subsect. Pierotianae

Cheng, Yuan-Hao & Yang, Tusng-Yu Aleck, 2024, Two new taxa of Clematis subsection Pierotianae (Ranunculaceae) in Taiwan, Phytotaxa 662 (1), pp. 19-36 : 27

Key of Clematis subsect. Pierotianae in Taiwan

1. Leaves ternately compound, leaflets 3 ...............................................................................................................................................2

- Leaves biternately to flammuliform compound, leaflets 5–9.............................................................................................................4

2. Abaxial surface of leaflets densely velutinous .......................................................................... 2b. C. parviloba subsp. shengzhenii

- Abaxial surface of leaflets sparsely pubescent...................................................................................................................................3

3. Leaflets sometimes deeply 3-lobed; sepals 4.3–12.2 mm long; stamens 30–45....................................................... 1. C. formosana

- Leaflets unlobed; sepals 12.4–18.6 mm long; stamens 78–116 ........................................................................................ 3. C. pengii

4. Leaflets ovate–lanceolate, abaxially sparsely pubescent; sepals ovate, pale green ...................................................... 4. C. tamurae

- Leaflets ovate, abaxially densely velutinous; sepals elliptic, white ...................................................................................................4

5. Stamens 40–63; anthers 1.4–1.8 mm long; filaments linear and fusiform...................................... 2a. C. parviloba subsp. bartlettii

- Stamens 92–118; anthers 0.9–1.2 mm long; filaments linear.................................................... 2b. C. parviloba subsp. shengzhenii