orange plant blood orange plant Citrus sinensis (L.) Osbeck PLANTS:CISI3 MANSFELD:7673 Citrus ×sinensis (L.) Osbeck (pro sp.) WIKIPEDIA:Blood_orange The blood orange is a variety of orange (*Citrus sinensis*) with crimson, almost-blood-colored flesh. The fruit is smaller than an average orange; its skin is usually pitted, but can be smooth. The distinctive dark flesh color is due to the presence of anthocyanins, a family of pigments common to many flowers and fruit, but uncommon in citrus fruits. The flesh develops its characteristic maroon color when the fruit develops with low temperatures during the night. Sometimes there is dark coloring on the exterior of the rind as well, depending on the variety of blood orange. The skin can also be more tough and harder to peel than other oranges. While all oranges are likely of hybrid origin between the pomelo and the tangerine, blood oranges originated as a mutation of the sweet orange. Within Europe, the Arancia Rossa di Sicilia (Red Orange of Sicily) has Protected Geographical Status. citrus sinensis requires discussion