KEY TO THE SPECIES

1Ovary 2-carpellate, at most an occasional flower on the same plant 3-carpellate.
1'Ovary 3-5-carpellate, at most an occasional flower on the same plant 2-carpel- late
2Venation distinctly sunken on upper leaf surface; lower surface of leaf hirsute (hairs simple or mainly stellate) without glandular trichomes
2'Venation slightly prominent on upper leaf surface; lower leaf surface (and usually many other parts also) with glandular trichomes
3Leaves densely velutinous beneath, the tomentum consisting of a closed underlayer of very short pale (fulvous) hairs from between which short stellate hair groups emerge; flowers (4- or) 5-carpellate
3'Leaves fairly densely stellate-hairy with intervenium mostly clearly visible between hairs to glabrous beneath; flowers 2-4-carpellate
4Flowers minute (e.g. sepals c. 0.6-0.8 mm long); younger twigs and peduncles with tomentum consisting of simple hairs up to 3 mm long and/or very short stellate hairs up to 0.1 mm long, or glabrous
4'Flowers small (e.g. sepals c. 1-1.3 mm long); younger twigs and peduncles with fairly dense to dense tomentum consisting of very short or longer stellate hairs, up to 1 mm long
5Leaflets fairly large, generally 8-17 by 2.5-9 cm; tomentum on lower side of leaflets stellate with hairs 0.2 mm long or more, sometimes with some glandular trichomes.
5'Leaflets fairly small, generally 4-7 by 1.5-3.2 cm; tomentum on lower side of leaflets stellate with hairs up to 0.1 mm long with some longer simple hairs, and always with conspicuous glandular trichomes