Frost Eureka Lemon

UCR credits H. B. Frost with originating this nucellar Eureka selection at the Citrus Research Center in Riverside, California. The page gives no selection year.^⁠[1]

UCR identifies Frost accession CRC 3005 (PI 539318; VI 21) as the second budded generation from a seedling of the old Rubidoux No. RT 765 line. The accession record lists Yuma Ponderosa lemon as its rootstock.^⁠[1]

At Riverside, UCR reports this accession's crop is spread through the year, mainly in late winter, spring, and early summer.^⁠[1]

For general Eureka context, the UCR page describes yellow, elliptical to oblong fruit with a short neck or collar, a blossom-end nipple, juicy greenish-yellow flesh and usually few seeds. Those descriptions and the comparisons with Lisbon are not separate measurements of Frost accession CRC 3005.^⁠[1]