Orig. in Riverside, Calif., by Howard B. Frost, California Citrus Expt. Sta. Introd. in 1935. King × Willowleaf; selected in 1925; sibling of Kinnow. <b>Fruit:</b> large, up to 3 1/8 inches in diam., averaging three to five per lb; medium oblate, fairly uniform; skin pebbled to nearly smooth, glossy, deep yellowish-orange; rind thin to medium, peels fairly well, oil glands many; flesh segments 9-13, separating easily, firm, rich yellow-orange, moderately tender, very juicy, aroma of juice unique, sugar content high, flavor rich and very good, being very sweet late in season; 10-17 monoembryonic seeds; some granulation under California desert conditions; ripens January to March in California desert, February to May in California coastal areas. <b>Tree:</b> vigorous; alternate bearer.