Publications

Botanical surveys undertaken in Central and Northern Tunisia (North Africa), mostly between 2015 and 2020, have revealed three new allochthonous cacti. The reported taxa belong to the genus Cylindropuntia (Cactaceae, subfamily Opuntioideae, tribe Cylindropuntieae). C. leptocaulis, C. prolifera and C. spinosior are here reported for the first time from North Africa. Updated nomenclature, descriptions, general and national distributions are ...

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Between 2015 and 2019 field work was carried out in campsites in Belgium and the Netherlands. These proved to harbor an extraordinary rich flora, consisting of (mostly) alien species and (very) rare native species that probably also were introduced, at least for the most part. These species were all introduced inadvertently by tourists, their seeds and / or fruits being attached to tent floors, car mats, shoes and clothing, car tires, etc. ...

In the south of France, at Rivesaltes (Pyrénées-Orientales), an apparently well-established population of the South American grass species Nassella longiglumis (Phil.) Barkworth has been observed for the first time in Europe. The discovery brings the number of naturalized species of this genus on the continent to five.

Based on morphological characteristics, genome size and molecular phylogenetics the identity of introduced taxa of Artemisia section Artemisia in Belgium and the Netherlands was critically re-assessed. It was shown that several populations of alleged A. verlotiorum belong to A. princeps instead. This species is native to Eastern Asia (China, Japan and Korea) and has not been reported before from Europe. Since the time of its arrival in Belgium ...

Various author citations for the African species Abutilon bidentatum are usually used. According to the International Code of Nomenclature, its basionym was effectively and validly published on the printed labels of the Schimper exsiccata Iter Abyssinicum II n. 1003 and the type must be chosen accordingly.

Species checklists are a crucial source of information for research and policy. Unfortunately, many traditional species checklists vary wildly in their content, format, availability and maintenance. The fact that these are not open, findable, accessible, interoperable and reusable (FAIR) severely hampers fast and efficient information flow to policy and decision making that are required to tackle the current biodiversity crisis. Here, we propose ...

Cyperus permacer sensu C.B. Clarke is not the same as C. permacer sensu Hooper in Flora of West Tropical Africa. A thorough study of herbarium specimens proved the latter to be a mere variety of C. tenuiculmis Boeckeler. The taxonomic identity of C. permacer itself is also unclear, the holotype being a poor specimen. It possibly is only a depauperate form of C. dilatatus Schumach.

Recent fieldwork in the maritime influence area of the provinces of Barcelona and Girona (NE Spain, Catalonia) yielded several interesting new records of non-native vascular plants. Abelia ×grandiflora, Bauhinia forficata subsp. pruinosa, Bidens vulgata, Celosia argentea, Chamaecyparis lawsoniana, Cyperus esculentus var. heermannii, Firmiana simplex, Hypericum canariense, Mollugo verticillata and Ruscus ×microglossus are reported for the first ...

Hordeum murinum subsp. murinum is a common archaeophyte in Belgium.
A more southern subspecies, subsp. leporinum, is known since 1938 as a rare, ephemeral alien, mostly associated with the grain or wool industry. In the past decade, however, it has increasingly been recorded. In port areas in Antwerp and Ghent it has locally naturalized along railway tracks, on roadsides and rough ground. In addition, it is also found in similar habitats in ...