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The superb flavor of trailing blackberry cultivars, such as `Marion', is derived from  Rubus ursinus  Cham. &amp; Schlecht. Wild  R. ursinus  offer a range of horticulturally desirable traits to breeders, from high fruit quality to improved cold hardiness. Current cultivars are derived from relatively few sources of  R. ursinus , selected primarily for fruiting characteristics. A replicated field trial of 460 clones, representing 20 populations from southern British Columbia, Washington, and Oregon, was established in 1994. Observations during the planting year have indicated that monitoring variability in the following reproductive traits will be useful in assessing diversity; budbreak, flowering, and fruiting date; lateral length; proportion of reproductive laterals; gender; flower and fruit number; and fruit size. In particular, there are clones that exhibit large fruit size (4 to 5 g), high flower number per lateral, and uniform fruit set. Analysis of these data will contribute to determination of relative genetic distances among the populations and enhance the understanding of the diversity available in  R. ursinus .

Variation in Reproductive Traits of Western Trailing Blackberry (Rubus ursinus) in the Pacific Northwest