| 1 | Flowers 65-83 mm long; hypanthium (or calyx tube) 55-70 mm long |
| 1' | Flowers much shorter, 6-46 mm long; hypanthium (or calyx tube) 5-32 mm long |
| 2 | Hypanthium short, 3-7 mm long, about the same length as the calyx lobes. Ovary 2-ovuled. Pods suborbiculate, broadly ovoid or obovoid, or oblong, 4-8 by 3-4 cm, 1- or 2-seeded |
| 2' | Hypanthium usually longer, (7-)9-32 mm long, usually 0.5-2 times longer than calyx lobes. Ovary 6-12-ovuled. Pods of other shape, not like above, often longer or larger, usually 15-35(-50) by 5 — 8( — 10) cm, often 4-8- (or more-) seeded |
| 3 | Filaments and staminodes united at the basal part into a short tube 4-9 mm high. Ovary 6-ovuled. Pods (only one seen) somewhat spindle-shaped, 24 by 5 cm, attenuate at the base |
| 3' | Filaments and staminodes free or obscurely united at the base. Pods of other shape, not like above, varying in size, usually cuneate or obliquely rounded at the base |
| 4 | Bracts and bracteoles very small, 1-2 mm long, both caducous. Ovary 6-ovuled. Pods oblong or oblong-lanceolate, 15-18 by 5-6 cm. Seeds (only one seen) suborbicular, c. 3.7 by 3.1 cm |
| 4' | Bracts and bracteoles usually much larger, up to 35 mm long, often persistent at least during anthesis, or caducous. Ovary 6-12-ovuled. Pods and seeds varying in shape and size (see below) |
| 5 | Stamens usually 4, rarely associated with only 3 or up to c. 7. Pedicel length between bracteoles and the flower 2-6(-8) mm |
| 5' | Stamens usually 6-8, rarely associated with only 5 or up to 10. Pedicel length between bracteoles and the flower (4-)7-10(-14) mm |
| 6 | Inflorescences rather big, robust, up to 35(-40) cm wide, the main branches often thick, up to 10 mm in diam. Bracts (to be observed on very young inflorescences) much larger than the bracteoles, oblanceolate, 12-35 by 7-22 mm. Pods narrowly oblong, 15-45(-50) by 3.5-10 cm |
| 6' | Inflorescences rather smaller, slender, up to 15(-30) cm wide, the main branches rather thin, up to c. 3 mm in diam. Bracts usually smaller than the bracteoles, ovate or obovate, 3-12 by 1.5-7 mm. Pods oblong or lanceolate, 7-31 by 3-7 cm.. |
| 7 | Bracteoles caducous or persistent during anthesis, erecto-patent to spreading, not clasping the pedicel. Ovary 6-8- ovuled. Pods oblong or narrowly oblong-lanceolate, 6-25 by 2-6 cm |
| 7' | Bracteoles persistent during anthesis, erect, clasping the pedicel. Ovary 8 — 10( — 12)- ovuled. Pods oblong or elongate-oblong, or scimitar-shaped, 12.5-25 by 3.5-6.5 cm |
