| Stolons |
present |
absent |
absent |
absent |
| Leaf |
| size (cm) |
1.6–3.3 × 1.5–2.7 |
3.9–8 × 2.9–5 |
3–8.5 × 2.5–5.5 |
2.5–5.5 × 2.3–4.8 |
| indumentum |
| adaxially |
scabrous |
pubescent |
puberulent |
villous |
| abaxially |
scabrous, densely woolly and scabrous along veins |
pubescent to densely woolly |
puberulent |
villous along veins |
| margin |
entire |
shallowly serrate or crenate to entire |
subentire to indistinctly crenulate |
distinctly serrulate |
| Inflorescence |
1–3-flowered |
8–15-flowered |
1–2-flowered |
multi-flowered |
| Corolla |
sub-actinomorphic |
sub-zygomorphic |
zygomorphic |
zygomorphic |
| tube |
campanulate |
broadly tubular to narrowly funnelform |
campanulate |
campanulate |
| lobes |
spreading |
nearly erect, in line with tube |
spreading |
spreading |
| colour |
white |
white to pale blueish-purple |
pink to pinkish-white |
pink |
| stamens |
| number |
4 |
4 |
1–3 |
2 |
| colour |
yellow |
yellow |
reddish-purple to pinkishyellow |
gray |
| staminodes |
1 |
1 |
2 |
0 or 2 |
| stigma |
T-shaped |
disc-shaped |
T-shaped |
disc-shaped |