An early ripening, genetically spineless, erect blackberry with excellent fruit quality. Origin: in Fayetteville, Ark., by J.N. Moore and J.R. Clark, Dept. of Horticulture, Univ. of Arkansas. Ark. 631 × Ark. 883. (Both parents are heterozygous for recessive spineless genes derived from Merton Thornless via Thornfree). Cross made in 1982; selected in 1985; tested as Ark. 1536; introd. in 1993. Plant patent 8510; 21 Dec. 1993; assigned to Univ. of Arkansas. Tree: productivity similar to Navaho; moderately vigorous; very erect spineless canes; produces more primocanes from roots than Navaho; good cold hardiness to-24C. No symptoms of either orange rust or rosette have been observed despite high levels of inoculum of the respective causal organisms. Fruit: medium size; bright glossy black; firm; small seed size; short conic shape; earlier ripening than any other spineless blackberry cultivars; concentrated season of 4 weeks; high soluble solids concentration; stores well; excellent flavor fresh and processed.