Abstract
Rubus canduliger is described as a new regional bramble species belonging to the seriesDiscolores. It has been recognized in the Netherlands as a distinct species for more than 70 years but identified as the central EuropeanR. grabowskii. The latter, however, differs by its tapering prickles, regular leaves with longer petiolule of the terminal leaflet, broader, often pyramidal inflorescence, and white or pink flowers with carpels hairy at the top.R. canduliger has a well-defined range north of the Rhine river around Arnhem where it occurs in urban and other disturbed habitats. Historical events, e.g. transport of young trees in the 16th century may explain most records south of the Rhine river, 25–50 km outside the main range. The ecology and phytosociology of the new bramble are discussed. Its distribution is compared toR. trichanthus, another regional species with a similar range asR. canduliger, but occurring in more natural habitats.
In pseudogamous European blackberries (Rubus sectionRubus =R. fruticosus agg.), range size is considered to be related to the age of the species. Several widespread species have disjunct distribution ranges that are suggested to be the result of long-distance dispersal by migratory birds but unintentional anthropogenic transport of seeds may be involved as well. We hypothesize that in northwestern Europe fragmentation of continuous ranges of widespread species was caused by ongoing deforestation and subsequent degradation (acidification) of originally base-rich sandy and loamy soils from the Iron Age onward. Many regional species, however, have originated and spread in the resulting man-made landscapes. A classification of range types of brambles differing in size and internal structure is presented.
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Bijlsma, RJ., Haveman, R. Rubus canduliger, a new regional species from the Netherlands, with notes on the range structure and dynamics of brambles (Rubus, Rosaceae). Folia Geobot 42, 315–329 (2007). https://doi.org/10.1007/BF02806469
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DOI: https://doi.org/10.1007/BF02806469