province | Buenos Aires Province | Transvaal Province | Katanga Province | Cape Province | Western Province | New Ireland Province | Kars Province | Pichincha Province | Santa Fe Province | Dewa Province | Entre Ríos Province | Roman province | Rhine Province | Natal Province | Helmand Province | Battambang Province | La Convención Province | Hakkâri Province | Western Province (Papua New Guinea) | Northern Province | Mendoza Province | Guanacaste Province | Province of New York | Fars Province | Boulgou Province | Province | Manabí Province | El Oro Province | Tigray Province |
Numerous artificial hybrids long thought to involve N. thorelii likely represent crosses with other Indochinese species of the "N. thorelii aggregate"—particularly N. bokorensis, N. kampotiana, and N. smilesii, as these were the most accessible to plant collectors—or hybrids thereof.