| 1 | Flowers in racemes, opposite. Evergreen, not climbing with roots. Calyx with well-developed lobes, 1-4 cm long. Corolla with a hair-ring (lax or stuppose, sometimes replaced in part by capitate-glandular papillae) near the insertion of the stamens. |
| 1' | Flowers paniculate in terminal thyrses, very rarely depauperate in racemes but then the calyx much smaller than 1 cm. Corolla lobes widely imbricating. Anther-cells divaricate. |
| 2 | Racemes almost always on the old wood, rarely axillary or terminal. Peduncle at the base with crowded sterile bracts, rachis up to 7 cm, pendent, flowers close together. Calyx large, 1½-4cm. Corolla 6-12 cm, tube not contracted below the slightly or distinctly zygomorphous limb; lobes deltoid, in bud narrowly imbricate. Anthers mostly included, cells almost always divaricate. Valves of the capsule widely or narrowly boat-shaped; endocarp not removable |
| 2' | Racemes terminal on leafy twigs. Peduncle at base without bracts; flower pairs spaced. Calyx c. 1 cm. Corolla c. 3½cm long, tube contracted below the limb; lobes rounded. Stamens ± exserted; anther-cells free but parallel. Capsule narrowly elliptic-oblong, with removable papery endocarp. Chile. |
| 3 | Deciduous, climbing with roots. Leaflets 5 pairs, distinctly sharply serrate. Calyx large, c. l½-3 cm, with large lobes. Corolla inside glabrous, large, c. 5½-8 cm |
| 3' | Evergreen, not climbing with roots, rarely erect (in arid country). Leaflets 1-7 pairs, not distinctly sharply serrate in mature specimens. Calyx small, stunted or short-lobed, 2½-8 mm. Corolla smaller, 1½ -3½ (5) cm, almost always with a hair-ring near the insertion of the stamens and long hairs onesided in throat and upper part of tube |
