1 | Flowers hermaphrodite; anthers valvate; filaments of stamens with a pair of glands; fruits with persistent elongated plumose style (Subfam. ATHEROSPERMATOIDEAE) |
1' | Flowers unisexual; anthers dehiscing by slits; filaments without glands; style not persistent in fruit. |
2 | Lianas; receptacle splitting irregularly when ripe to reveal drupes dispersed over its inner surface (Subfam. MONIMIOIDEAE) |
2' | Trees or shrubs, or if rarely scandent then fruit not as above (Subfam. MOLLINEDIOIDEAE). |
3 | Male flower with a small, flat receptacle bearing relatively large rotund tepals; after anthesis female receptacle splitting irregularly from the ostiole; fruit a head of sessile drupes with the irregular rim of the receptacle reflexed below them (Tribe HEDYCARYEAE) |
3' | Male flower with a globose or flask-shaped receptacle, either with a small ostiole or (in Kairoa) splitting open at anthesis to form a cup with sharply lobed margin; after anthesis upper half of female receptacle abscissing as a calyptra; fruit a head of sessile or stipitate drupes with the annular scar of the calyptra below them (Tribe MOLLINEDIEAE). |
4 | Female receptacle with thickened glands inside the ostiole. |
4' | Female receptacle without glands inside the ostiole. |
5 | Style-stigma subulate; anthers dispersed irregularly within the receptacle. |
5' | Stigma sessile obtuse; anthers disposed regularly in whorls of 4 or in decussate pairs. |
6 | Anthers dehiscing by a horseshoe-shaped slit |
6' | Anthers dehiscing by two vertical slits |
7 | Stamens in several whorls of 4 |
7' | Stamens in two whorls (up to 4 stamens) |
8 | Male receptacle at anthesis a fleshy cup with rim split into acute lobes; stamens numerous (over 100); stigma short sessile; stems and branches with prominent irregular longitudinal ridges of cork |
8' | Male receptacle at anthesis with an ostiole surrounded by minute tepals; stamens few; branches ± smooth. |
9 | Anthers dehiscing by a single horizontal or horseshoe-shaped slit |
9' | Anthers dehiscing by two vertical slits |