The Rubus reference article from the English Wikipedia on 24-Jul-2004
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Rubus

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Rubus
Rosa arvensis

Rosa arvensis
Scientific classification
Kingdom : Plantae
Division : Magnoliophyta
Class : Magnoliopsida
Order : Rosales
Family : Rosaceae
Genus : Rubus
Species
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Rubus is a genus of plants in the family Rosaceae, subfamily Rosoideae. These plants have prickles like roses and are often called brambles; this name is most often used for the blackberry and similar fruits that are also of rambling habit, and not used for those like the raspberry that grow as upright canes.  Their fruit, called bramble fruit, is an aggregate of drupelets.