Key to the Amyema species of Indonesia (excl. Irian Jaya) and Malaysia

1Inflorescence a pedunculate umbel of 2 or more triads
1'Inflorescence other than a pedunculate umbel of triads (e.g., a head, simple umbel, solitary flower or sessile cluster)
2Triads with all flowers closely sessile
2'Triads with at least the lateral flowers pedicellate, sometimes very shortly so..
3Rays in the umbel 2-4; corolla 14-18 mm long; anther equal to the free part of the filament; leaf lamina flat
3'Rays in the umbel 5 or more; corolla 18-20 mm long; anther much shorter than the free part of the filament; leaf lamina often folded .
4Rays in the umbel 2-5
4'Rays in the umbel 6 or more
5Rays in the umbel mostly 4 or 5; central flowers of the triads mostly pedicellate..
5'Rays in the umbel mostly 2 or 3; central flowers of the triads sessile
6Corolla in mature bud ridged or winged longitudinally, lacking a globular inflation at the base; anthers not transversely septate
6'Corolla in mature bud terete or angular but not ridged or winged longitudinally, with a globular inflation at the base; anthers transversely septate... .
7Corolla 5- or 6-merous; triads with the central flower sessile; leaves opposite... .
7'Corolla 4-merous; triads with all flowers shortly pedicellate; leaves rarely opposite, mostly in whorls of 3-6 (rarely scattered)
8Rays of the umbel 6-8; peduncle less than 10 mm long.. .
8'Rays of the umbel 9 or more; peduncle more than 10 mm long
9Leaves opposite, ternate or scattered ternate; lamina up to 10 cm long
9'Leaves in whorls of 3-6; lamina 10-30 cm long
10Inflorescence a pedunculate or sessile 6- or 9-flowered head formed from 2 or 3 sessile triads
10'Inflorescence not as above (a pedunculate or sessile simple umbel or a solitary flower)
11Leaves ternate; inflorescence 9-flowered
11'Leaves opposite; inflorescence 6-flowered
12Leaves sessile
12'Leaves obscurely or distinctly petiolate
13Leaves truncate to cordate at the base; peduncle rudimentary (inflorescence sessile)
13'Leaves cuneate to truncate at the base; peduncle 2-5.5 mm long.
14Leaves glossy grey/green above and dull brown below; petiole distinct, 5-10 mm long; inflorescence peduncle 0.5-2.5 mm long
14'Leaves dull on both sides at least when dry; petiole short or obscure, mostly less than 5 mm long; inflorescence peduncle usually 2-11 mm long
15Peduncle 5-11 mm long; leaf lamina obtuse or rounded at the apex
15'Peduncle usually 2-4 mm long; leaf lamina acute at the apex
16Inflorescence a sessile 1- to 3-flowered umbel ( I.c., the flowers sometimes seemingly solitary)
16'Inflorescence a pedunculate simple umbel
17Rays of the umbel c. 12; corolla 5- or 6-merous
17'Rays of the umbel 3-6; corolla mostly 4-merous