1 | Tomentum on twigs dense, relatively long-persistent, consisting of patent hairs 0.2-0.6 mm long |
1' | Tomentum on twigs dense to open (twigs almost glabrous), consisting of ± adpressed hairs or very short patent hairs less than 0.1 mm long |
2 | Abaxial surface of calyx sparsely hirsute or strigose-hirsute throughout. Upper surface of leaves hirsute along midrib and nerves with tomentum ± persistent; intervenium on both surfaces bearing an evanescent tomentum |
2' | Abaxial surface of calyx glabrous or at most very sparsely strigose near base only. Upper surface of leaves glabrous or with few usually caducous hairs on midrib and nerves; intervenium on both surfaces glabrous |
3 | Ovules 2 per cell |
3' | Ovules 4 per cell |