| 1 | Stipules only adnate to the very base of the petiole. Stipular scar hardly or not present. Innovations, stipules, young petioles and underside of leaves never woolly pubescent. |
| 1' | Stipules higher adnate to petiole, stipular scar clearly present. |
| 2 | Peduncles appressedly hairy |
| 2' | Peduncles glabrous. |
| 3 | Underside of leaves densely minutely reddish-brown appressedly hairy. Nerves in 10-15 pairs |
| 3' | Underside of leaves glabrous. Nerves in 14-20 pairs |
| 4 | Innovations, peduncles, stipules and underside of leaves rufous woolly pubescent. |
| 4' | Twigs and stipules glabrous or nearly so. Hairs if present minute and appressed. |
| 5 | Fruits cylindrical, 2-3 times as long as wide; carpels mostly opening along the dorsal suture first. Ovary conical or cylindrical |
| 5' | Fruits ellipsoid or ovoid, only slightly longer than wide |
