A cup-shaped extension of the floral axis usually formed from the union of the basal parts of the calyx, corolla, and androecium, commonly surrounding or enclosing the pistils.

• 托杯，被丝托 Hypanthium 花轴(花托)的杯状延伸部分，常由花萼、花冠和雄蕊群的基部联合而成，通常包围或包裹着雌蕊。