| Size of flower or inflorescence |
Large, bright, often fragrant |
Small, inconspicuous, often green or brown |
| Perianth |
Often large, brightly colored, or with nectar guides |
Reduced or absent |
| Separate - or bisexual |
Often bisexual, but can be unisexual |
Often unisexual (dioecious or monoecious) |
| Scent, nectar |
Usually present and often strong |
Absent |
| Pollen characteristics |
Sticky, heavy, spiny, produced in moderate amounts |
Light, smooth, dry, produced in very large quantities |
| Ecological characteristics |
Attracts pollinators (insects, birds, bats) |
Relies on wind for pollen dispersal |