A thorny, erect blackberry. Origin: Cross made at the Univ. of Arkansas with parentage [Lawton × (Darrow × Brazos)] × (Shaffer Tree × Brazos); seeds were brought to EMBRAPA/Clima Temperado, Pelotas, RS, Brazil; sel. by Alverides Santos and propagated under the name Guarani at EMBRAPA. Not patented or protected. Tree: erect; thorny; vigorous and commonly suckers from the roots; low-chilling; productive with average production under Southern Brazil conditions of 3.6 kg/plant. Fruit: medium, 5–6 g; dark, uniform color; flavor sweet but prominent acidity also; firm; small seeds; ripens one week after Tupi.
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