loganberry
noun
lo·gan·ber·ry ˈlō-gən-ˌber-ē 
: a red-fruited upright-growing dewberry (Rubus loganobaccus) usually regarded as a hybrid of a western dewberry and a red raspberry or sometimes as a variety (R. ursinus loganobaccus) of a western dewberry
also : its berry
Example Sentences
Recent Examples on the Web Among other fancy chocolates, don’t miss the gourmet PB&J. Almond-pecan-peanut butter and raspberry-loganberry-boysenberry-cherry jelly are hidden inside a milk chocolate shell. 
Liz Biro, Indianapolis Star, 25 June 2018 Growers Walter Knott and his family first began selling boysenberries — a mix of blackberry, loganberry and raspberry – at a roadside stand in the late 1920s. Joseph Pimentel, Orange County Register, 27 Mar. 2017 At the World’s Fair, Erickson befriended famed horticulturist Luther Burbank, whose inventions included the crimson Phenomenal berry, a blackberry-raspberry cross similar to a loganberry. Rebekah Denn, The Seattle Times, 17 May 2017
Liz Biro, Indianapolis Star, 25 June 2018 Growers Walter Knott and his family first began selling boysenberries — a mix of blackberry, loganberry and raspberry – at a roadside stand in the late 1920s. Joseph Pimentel, Orange County Register, 27 Mar. 2017 At the World’s Fair, Erickson befriended famed horticulturist Luther Burbank, whose inventions included the crimson Phenomenal berry, a blackberry-raspberry cross similar to a loganberry. Rebekah Denn, The Seattle Times, 17 May 2017 Word History
Etymology
James H. Logan †1928 American lawyer + English berry
First Known Use
1893, in the meaning defined above