| The perianth is commonly uniseriate, consisting of 3-5 valvate, basally connate sepals, but sometimes an equal number of petals are also present. |
| Sepals 4, or rarely more, colored, the valvate margins turned inward in the bud. |
| Calyx 5-parted, valvate in the staminate flowers, imbricate in the pistillate. |
| Corolla pentamerous, gamopetalous and caducous, with valvate aestivation, presumably rotate and reflexed. |
| Corolla 4-parted, rarely 3-parted, wheel-shaped, valvate in the bud. |
| The flowers display valvate, distinct, or connate sepals and petals. |
