engleski

"Flying under the radar" - invasive Reynoutria x bohemica Chrtek et Chrtkova (Polygonaceae) in Croatia

The case of Reynoutria × bohemica begins back in the 1983, when this taxon was firstly described from the Check Republic as a hybrid between Asian R. japonica Houtt. and R. sachalinensis (F. S. Petrop.) Nakai in T. Mori, both alien and invasive in Europe. In their native range, the two taxa are not sympatric ; thus the hybrid is considered to originate in the introduced range. Although firstly described in 1983, revised herbarium specimens show that R. × bohemica occurs in European horticulture since (at least) 1872, and as naturalized since (at least) 1954. Unfortunately, the spread of this taxon had been largely neglected, due to the similarity with parental species. Reports from many European countries emphasize the probability of frequently recording R. × bohemica as one of its parents. The situation in Croatia is not different – both parental species have been recorded since the mid 20th century, but the hybrid is still not listed on the checklist, although, according to our personal knowledge, appears to be widely distributed. The main aim of this study was to finally include R. × bohemica into Croatian checklist, and to begin the unravelling of the existing confusion between the three taxa. For this purpose, we have revised specimens of Reynoutria spp. from all Croatian herbaria (ZA, ZAHO, CNHM, ZAGR), and collected new specimens from the field. Although the distribution of all three taxa should be carefully reviewed in the following years, according to our personal observations, R. × bohemica is by far the most widespread in Croatia.

Reynoutrya x bohemica ; Reynoutra japonica ; invasive species

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