| 1 | Inflorescences urceolate, the opening entirely closed by (ostiolar) bracts; waxy glandular spots on the lamina lower surface (on the base of the midrib, in the axils of lateral veins and/or furcations of lateral veins), or on leafy twigs just below the nodes |
| 1' | Inflorescences mostly spicate, capitate, or discoid, or if urceolate, then the opening not entirely closed; waxy glandular spots mostly absent (present in Artocarpus subg. Pseudojaca) |
| 2 | Stamens bent inwards in bud, at anthesis bending outwards suddenly and elastically, or if straight in the bud, then the plant armed with thorns on the branches |
| 2' | Stamens straight or bent outwards in bud or, if bent inwards, then straightening gradually; plants without thorns |
| 3 | Inflorescences discoid-, turbinate- or globose-capitate, bisexual, or if (secondarily) unisexual, then fruits adnate to the perianth (and receptacle), or the plant herbaceous |
| 3' | Inflorescences spicate, clavate- to globose- (to discoid-)capitate, or discoid-capitate to urceolate and involucrate, (primarily) unisexual; plant woody |
| 4 | Trees with self-pruning branches; inflorescences discoid and involucrate with imbricate bracts; fruit adnate to the perianth, if not so, then the exocarp indehiscent |
| 4' | Trees without self-pruning branches; inflorescences not involucrate (or subinvolucrate), or if involucrate, with imbricate bracts and the fruits with a dehiscent exocarp |
| 5 | Inflorescences discoid to urceolate, involucrate with basally attached imbricate bracts enclosing the flowers, at least before anthesis; fruits dehiscent drupes |
| 5' | Inflorescences spicate to clavate-, ellipsoid-, to globose-, or discoid-capitate, if the heads subtended by bracts, then these short and not enclosing flowers before anthesis; fruits indehiscent |
