Taxonomic remarks on Isatis tinctoria (Brassicaceae) from Pollino National Park (Basilicata, Italy)

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Isatis L. (Brassicaceae) is an Eurasian genus including 79 species (1). It is one of the most difficultcruciferous genera (2). Some species, in fact, are highly polymorphic in fruit morphology, the structures thatprovide the most diagnostic characters (3). In addition, due to the extreme variability in all morphologicalcharacters, the limits of many species are uncertain (4). Most if not all diagnostic characters used in earlierclassifications are very variable and because of the unreliability of vegetative and floral characters it isdifficult or impossible to identify many specimens when mature fruits are missing (5). The patterns ofvariation suggest that hybridisation may be widespread (4). Moreover, intermediate specimens are ratherfrequent, even between some taxa that are morphologically easily recognisable (4). In Italy, according toConti & al. (6), Isatis is represented by 3 species: I. apennina Grande (= I. allioni P.W.Ball), endemic toItaly and France (south-west Alps and central Apennine), I. praecox Kit., an European taxon restricted toLombardia, and I. tinctoria L., an Asiatic species widespread in central and south Italy. Floristicinvestigations in the Pollino National Park (on the Lucanian side) led to the discovery of a little populationreferable to I. tinctoria. However, a comparative study of the plants showed that they differ in many relevantcharacters. The fact that this Lucanian population has morphological dissimilarities involves its criticalrevision that could bring to a new taxonomic delimitation.
Lingua originaleEnglish
Numero di pagine1
Stato di pubblicazionePublished - 2015


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