The olallieberry (/ˈoʊləliˌbɛri/ OH-lə-lee-berr-ee), sometimes spelled ollalieberry, olallaberry, olalliberry, ollalaberry or ollaliberry,[citation needed] is the marketing name for the 'Olallie' blackberry released by the USDA-ARS (in collaboration with Oregon State University).

'Phenomenal' in turn is a cross of the 'Aughinbaugh' western dewberry and 'Cuthbert' red raspberry and so has a similar background to Logan's 'Loganberry' because it shares a parent.

[3] The original cross was made in 1935 by George Waldo with the United States Department of Agriculture Agricultural Research Service (USDA-ARS), who ran the cooperative blackberry breeding program between the USDA-ARS and Oregon State University from 1932 until the 1960s.

[4] During the 20th century, the Olallieberry was hybridized with the Chehalem blackberry to produce the Marion blackberry or Marionberry, which – when used as the fruit in a pie – was named as the official state pie of Oregon in 2017.

[1][6][7] Olallie Lake in Oregon's Cascade Range is named after the Chinook term due to the abundance of berries in that area.