| 1a | Inflorescences 1–5-flowered; petals elliptic-ovate; ovule 1 per carpel; distributed in Vietnam | P. floribunda |
| 1b | Inflorescences 1–2-flowered; petals linear; ovules 2 per carpel; distributed in China | 2 |
| 2a | Inflorescences 1–2-flowered; pedicel to 5–7 mm long; flowers green; distributed in Xizang, China | P. chinensis |
| 2b | Inflorescences with a single flower; pedicel 1–2 mm long; flowers white; distributed in Yunnan, China | P. verrucipes |
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