Since Beta Crucis is at roughly − 60 ° declination, it is only visible south of the Tropic of Cancer and therefore didn't receive an ancient traditional name; "Becrux" is simply a combination of the "Be" in Beta plus Crux.
Since Beta Crucis is at roughly − 60 ° declination, it is only visible south of the Tropic of Cancer and therefore didn't receive an ancient traditional name. "Mimosa" is a recent name based on its color; "Becrux" is simply a combination of the "Be" in Beta plus Crux.