A thorny, trailing blackberry with yellow fruit. Origin: Jackson County, Texas by John William Clark. Spontaneous mutation of the southern dewberry, Rubus trivialis. USPP 14,935, issued 22 June 2004. Tree: trailing; thorny with glandular hairs; canes are green and lack red coloration of normal Rubus trivialis; flowers have increased petal number compared to R. trivialis, up to 15/flower; ploidy assumed to be 2n=2x=14 based on R. trivialis parentage. Fruit: yellow (lacking anthocyanin pigments); medium-small, 3.7 g; blocky-ovoid, occasionally spheroid; 8.7% SS; flavor sweet and similar to R. trivialis; seed wt. 2.4 mg; ripens very early, 19 Apr. in Jackson County, Texas and 10-15 days before Brazos.
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