KEY TO THE SPECIES

1Flowers tubulose-campanulate; limb 4.5-7 mm long. Style straight, sparsely scaly at base only. Perianth segments (2-)3-4 by 2-3.25 mm. Continental Southeast Asia
1'Flowers trumpet-shaped; limb 1-4 mm long. Style at apex hook-shaped.
2Limb 3.5-4 mm long, sometimes thickened at base. Style densely stellate-scaly, especially near the base. Perianth segments (1 —)1.5—2 by 1.5-2 mm
2'Limb 1—3(—4) mm long. Style glabrous, rarely with some stellate scales at base. Perianth segments 2-4(-5) by 2-3 mm