Characters C. pingtaoi C. hooperianum C. pulchellum C. longhushanense
Calyx length 6 mm 3–4 mm 3–4 mm 6 mm
Corolla-tube length 12–14mm 8–9 mm 12–18mm 12–16 mm
Corolla lobe shape Broadly ovate (Figure 4: a) Ovate Ovate-oblong Oblong (Figure 4: e)
Corolla color Outer surface greenish-white, inner surface purplish red (Figure 4: d) outer surface with light green, inner surface white, with purple spots on the top of corolla lobe Outer surface slightly greenish, inner surface white Outer surface greenish-white, inner surface white, usually with a purple minute spot on the top of corolla lobe (Figure 4: h)
Corona tip Connivent, slightly exceeding corolla throat (Figure 4: c) Separate, reaching to the middle of the corolla lobe or farther Barely connivent, slightly exceeding corolla throat Connivent, not exceeding corolla throat (Figure 4: g)
Follicles Fusiform, with three ribs / Oblong, without ribs Fusiform, with three ribs