| Leaf | 6.2–10.5 × 2.1–3.6 cm | 2.5–6.5 × 1.5–2.7 cm |
|---|
| Leaf shape | oblong-elliptical | oblong-elliptical |
|---|
| Leaf apex | short acuminate | acute |
|---|
| Leaf margin | entire or slightly sinuate | serrulate |
|---|
| Leaf blade | 5–7 pairs | 4–5 pairs |
|---|
| Petiole | 1.4–2.5 cm long | 1.0–2.5 cm long |
|---|
| Inflorescence | bracteate heads | dense bracteate heads |
|---|
| 1.3–5.1 ×1.1–1.9 cm | 1.0–5.0 × 1.2–1.8 cm |
|---|
| Bract | broadly oblong, outermost longer than the inner | broadly oblong, outermost smaller than the inner |
|---|
| 0.5–1.0 × 0.2–0.6 cm | 1.2–1.7 × 0.6–1.2 cm |
|---|
| Bracteole | 7.9–9.1 × 1.9–2.0 mm | 8–10 × 1–2 mm |
|---|
| pubescent along margin towards the apex | glabrous |
|---|
| Calyx | 5–6 mm | 5–6 mm |
|---|
| softly pubescent along margin towards the apex | glabrous |
|---|
| Corolla colour | white with prominent dark purple lines at throat | pale violet |
|---|
| Corolla length | 1.4–1.5 cm | 2.9–3.3 cm |
|---|
| Corolla width | 2.1–2.3 cm | 1.0–1.5 cm |
|---|
| Stamens | one sterile, 4 fertile | 5 fertile |
|---|
| Capsule | 8–9 mm × 2–3 mm | 12–13 × 3–4 mm |
|---|