Ten Degree Tangerine is a cold-hardy hybrid of Clementine × Yuzu, originally designated Clemyuzu 2-2. The original name reflects its parentage (CLEMentine × YUZu) and its selection number within the breeding population. The selection was later renamed Ten Degree Tangerine by Stan McKenzie of McKenzie Farms (South Carolina) after the tree reportedly survived exposure to a 10 °F (−12 °C) freeze. Following subsequent cold events, McKenzie later remarked that the cultivar could more accurately be called “Eight Degree Tangerine” due to reported survival at 8 °F (−13 °C). McKenzie’s promotion and distribution of the plant are largely responsible for the variety’s more recent popularity among hobby growers. Earlier documentation appears in Hardy Citrus of Texas Part II by Dr. Brown, which provides a detailed first-hand account of the cross. Following the January 1961 freeze, a Clementine tangerine recovered and returned to bloom, at which point it was intentionally pollinated with Yuzu pollen. The resulting seedlings were designated ClemYuzu. In this paper, Clemyuzu 2-2 is reported to have survived “perhaps five degrees above zero” (≈5 °F / −15 °C) with only slight damage, though the tree produced no crop the following year. Although later passages in the literature variably describe the cross as “Yuzu pollinated by Clementine,” the broader narrative and breeding context make clear that Clementine was the seed parent and Yuzu the pollen parent. The Clemyuzu naming convention and the described flowering sequence support this interpretation. While the term “Clementine tangerine” can be ambiguous by modern usage—where many mandarins are informally grouped as clementines—contemporaneous literature strongly suggests a more specific meaning. Based on period sources, including Circular No. 181 – New Citrus Hybrids, the Clementine referenced is most likely the original Algerian Clementine discovered and documented by Louis Trabut, rather than a later nucellar selection or regional clone. This identification is inferred from historical context and naming conventions of the time, as the specific Clementine clone is not explicitly stated in the original breeding records. In a video from Tough Citrus at McKenzie Farms with Stan McKenzie, Stan says it "tastes just like you're eating lemonade".