Pourthiaea

Liu, Bin-Bin & Hong, De-Yuan, 2017, A taxonomic revision of four complexes in the genus Pourthiaea (Rosaceae), Phytotaxa 325 (1), pp. 448-450 : 448-450

Key I. Key to complexes in Pourthiaea

1. Carpels 5, rarely 4; fruit ≥ 10 mm long.............................................................................................I. P. amphidoxa complex

- Carpels 2 or 3; fruit <10 mm long......................................................................................................................................... 2

2. Sepals caducous; carpels always 2 ...................................................................................................II. P. pilosicalyx complex

- Sepals persistent; carpels 3, rarely 2 ...................................................................................................................................... 3

3. Leaf blades, petioles, inflorescences, hypanthia, and branchlets ferruginous villous.................III. P. impressivena complex

- Leaf blades, petioles, inflorescences, hypanthia, and branchlets whitish villous or tomentose ............................................ 4

4. Pedicels <5 mm long; leaf blades, petioles, inflorescences, hypanthia, and branchlets densely tomentose when young ...... ..................................................................................................................................................................IV. P. blinii complex

- Pedicels ≥ 5 mm long; leaf blades, petioles, inflorescences, hypanthia, branchlets sparsely or densely villous when young ................................................................................................................................................................................................ 5

5. Leaf blades <25 mm wide; fertile seeds 6, rarely 5, aborted seeds 0 or 1 ....................................... V. P. salicifolia complex

- Leaf blades ≥ 25 mm wide; fertile seeds 1, 2 or 3, aborted seeds 5, 4 or 3 ........................................................................... 6

6. Lower surface of leaf blade densely and persistently tomentose; lateral veins of leaf blade nearly parallel .......................... .......................................................................................................................................................... VI. P. sorbifolia complex

- Lower surface of leaf blade glabrous, sparsely or densely villous, rarely tomentose, glabrescent in fruiting; lateral veins of leaf blade not parallel ............................................................................................................................................................. 7

7. Inflorescences a corymb, rarely a compound corymb (accompanied by tomentose hypanthia); petioles (1.0–) 1.7–4.3 (–7.8) mm long; shrubs or small trees ..................................................................................................VII. P. villosa complex

- Inflorescences a compound corymb or umbel; petioles (1.9–) 4.9–9.9 (–17.1) mm long; trees........ VIII. P. arguta complex