The Bayer designations a Hydrae and A Hydrae are distinct.
The modern constellation Hydra lies across two of the quadrants, symbolized by the Azure Dragon of the East (東方青龍, Dōng Fāng Qīng Lóng) and the Vermilion Bird of the South (南方朱雀, Nán Fāng Zhū Què), that divide the sky in traditional Chinese uranography.
This is the list of notable stars in the constellation Hydra, sorted by decreasing brightness.
This table lists those stars or other objects which have Bayer designations by the constellation in which those stars or objects lie.
This table lists those stars/objects which have Flamsteed designations by the constellation in which those stars/objects lie.