Family: Musaceae
| 1. Lacticifers present; flowers unisexual, plants monoecious | Suborder: Musineae Family: Musaceae |
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| 1. Lacticifers absent; flowers bisexual | go to 2 |
| 2. Root stele with medullary vessels and phloem; stem woody; two lateral petals fused to enclose anthers | Suborder: Strelitziineae Family: Strelitziaceae |
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| 2. Root stele polyarc; stem not woody; two lateral petals not so fused | go to 3 |
| 3. Extensive prolongation of ovary to form a solid tube; petals not fused; median petal free, forming labellum; median stamen of outer whorl fertile; median stamen of inner whorl absent | Suborder: Lowiineae Family: Lowiaceae
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| 3. Short or no prolongation of ovary to form a solid tube; petals fused at least at base; median petal not forming labellum; median stamen of outer whorl modified, sterile; median stamen of inner whorl present | Go to 4 |
| 4. Two arcs of air canals in leaf axis; raphide sacs present; five fertile stamens; lateral stamens of inner and outer whorls fertile; no perisperm | Suborder:Heliconiineae Family: Heliconiaceae |
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| 4. One arc of air canals in leaf axis; raphide sacs absent; one fertile stamen; lateral stamens of inner and outer whorls sterile; perisperm present | Suborder Zingiberineae |
| 5. Flowers zygomorphic; sepals fused at base; style unmodified, situated between anther sacs; anther tetrasporangiate; endosperm helobial | Superfamily: Zingiberariae | |
| 5. Flowers asymmetric; sepals free; style modified, separated from anther; anther bisporangiate; endosperm nuclear | Superfamily: Cannariae |
| 6. Phyllotaxy distichous; aromatic oils present in vegetative body; inner lateral staminodes fused into a labellum | Family: Zingiberaceae | |
| 6. Phyllotaxy spirally arranged; aromatic oils not present in vegetative body; all staminodes fused into a labellum | Family: Costaceae |  |
| 7. No mucilage cells in stems; pulvinus present; sgmoid lateral veins with evenly spaced cross veins in leaves; terminal pairs of enantiomorphic flowers; inner stamens modified into cucullate and callous staminodes; style not petaloid; single ovule per locule | Family:Marantaceae |  |
| 7. Mucilage cells in stems; pulvinus absent; lateral veins oblique in leaves; petaloid style; flower pairs not enantiomorphic; inner staminodes and style petaloid; multiple ovules per locule | Family: Cannaceae |  |
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