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Recent USDA plant collecting expeditions to Ecuador; the People's Republic of China, and within North America, have obtained a number of lesser known wild  Rubus  species. These, and additional species, are preserved as seedlots with some plant representatives, at the USDA-ARS National Clonal Germplasm Repository-Corvallis. In this study, the seed size of 40  Rubus  species was measured and contrasted. The average weight of the largest-seeded species of the study group,  R. megalococcus  Focke, an Ecuadorean blackberry, was 24.2 mg; European blackberry,  R. procerus  Muller, was 3.0 mg. The average weight of other European and North American blackberry and raspberry seed ranged from 2.7 to 1.3 mg. Asian raspberry species tended to be the smallest, ranging from  R. coreanus  Miq. at 1.2 mg to  R. eustephanus  Focke ex Diels at 0.3 mg. Several of the smaller seeded Asian species such as  R. formosensis  Kuntze,  R. minusculus  A. Leveille &amp; Vaniot,  R. hirsutus  Thunb., and  R. eustephanus  had many drupelets, which may be a heritable trait to benefit yield through breeding for increased fruit size.

525 PB513 SEED SIZE OF SELECTED RUBUS SPECIES