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..2 Plants monoecious; pedicels of pistillate flowers cylindrical (isodiametric through their length); staminate inflorescences of (1-) 2-5 flowers in a sessile fascicle
....3 Spine-bearing tubercles 1-2 mm long; leaves deeply 3-5-palmately lobed
....3 Spine-bearing tubercles 4-10 (-15) mm long; leaves slightly to deeply 3-5-palmately lobed
......4 Leaf blade central lobe broadly triangular; corolla tube of female flower 3.5-6.5 mm long; corolla tube of male flower 3.4-4.9 mm long; [cucumber]
........5 Fused portion of hypanthium or youngest fruits with appressed hairs; stem abundantly beset with retrorse prickles; fruit diameter 2.5-5 cm
..........6 Fruits with netted, warty, or scaly rind; ripe fruits with orange (rarely green) flesh, with aromatic flavor and musky odor; [canteloupes, muskmelons, etc.]
..........6 Fruits with smooth or wrinkled rind; ripe fruits with white or green flesh, lacking musky odor; [honeydews, etc.]