1 | Ovary superior, staminal structure a tube surrounding the pistil with a series of anthers above each other. Host plants in general Fagaceae |
1' | Ovary inferior or half-inferior, staminal structures different. Host plants species of Tetrastigma (Vitaceae) |
2 | Mature flower buds oblong. Perigone without diaphragm, lobes 16-18, valvate, ending in bayonets (elongate stiff pointed appendages), which are hidden in a cavity at apex of the column while flowers are in the bud stage. |
2' | Mature buds more or less globular. Perigone with a diaphragm, the lobes imbricate, 5-10 |
3 | Perigone lobes 5; ramenta only inside the flower tube |
3' | Perigone lobes 10; ramenta on top of the diaphragm |