Flame
Grapefruits

Vigorous trees. Fruit size is better than Star Ruby with flesh color about the same as Star Ruby. Probably not as cold sensitive as Star Ruby. Shows herbicide sensitivity. 

Flame trees grow vigorously to a large size and are reported to be more cold-tolerant than Star Ruby. The fruit has a smooth yellow rind and usually has a pink blush.  The flesh is tender and juicy and has an internal color almost as dark as Star Ruby.  Flame’s season is mid to late-season; the fruit holds well on the tree with some fading of the internal color when held past maturity.