| Altitude (m) | 2,400–2,700 | 1,500–2,100 | 1,600–2,300 |
| Plant height (m) | 1.5–3.0 | 3.0–10.0 | 3.0–7.0 |
| Young branch color | Green | Light green | Light green or purplish green |
| Indumentum of young branches | densely covered with white tomentum | glabrous | often glabrous |
| Leaf size (cm) | 5.5–9.5 × 2.5–4.0 | 6.0–10.0 × 2.0–3.5 | 8.0–13.0 × 2.0–4.0 |
| Leaf apex | acuminate | acute | obtuse |
| Indumentum of abaxial leaf surface at maturity | brown short tomentum | silvery appressed hairs | silvery appressed hairs |
| Lateral veins (pairs) | 8–11 | 10–14 | ca. 12–14 |
| Petiole indumentum | densely covered with long glandular hairs when young, glabrous at maturity | glabrous | pubescent when young, becoming glabrous |
| Pedicel indumentum | densely covered with white villous hairs | glabrous | sparsely white floccose hairs |
| Calyx length (mm) | ca. 1.5 | ca. 2.0 | — |
| Corolla color | white | creamy white to pink | cream white or pink |
| Corolla markings | pink | deep red to purplish red | purple |
| Stamens (no.) | 10 | 10 | 12–15 |
| Stamen length (cm) | 1.5–2.0 | 1.5–3.0 | 1.2–2.5 |
| Indumentum at filament base | densely covered with white stiff hairs | white tomentum | finely puberulent |
| Ovary indumentum | sparsely covered with colorless stellate hairs | glabrous or sparsely hairy at apex | white short tomentum |
| Capsule length (cm) | 1.2–2.0 | 2.0–2.5 | 1.8–2.5 |
| Capsule indumentum | sparsely covered with colorless stellate hairs | glabrous | white short tomentum or glabrous |
| Locules (no.) | (6 –) 7 (– 8) | 6 | — |