Abstract
A new species of Brassica sect. Brassica is described here from Sicily (Italy), which is known to be one of the centers of the diversification of wild taxa of this group. The new species (named Brassica tardarae) is restricted to the carbonate cliffs in the Tardara Gorges between Menfi and Sambuca di Sicilia (Agrigento province), an area with a peculiar geological history and where another strictly endemic species was recently described. The morphological relationships between the new species and other similar taxa are discussed, and an analytical key to the Sicilian taxa belonging to the genus Brassica sect. Brassica is also provided.
Highlights
Brassica is one of 321 genera of the Brassicaceae family, Tribe Brassiceae [1], comprising very variable species, both morphologically and genetically, which are widely utilized for human nutrition, mainly as vegetables, condiments, and edible oils
The studied population seems to be very close to these taxa regarding the indumentum of the leaves, which are glabrous, or with rare bulbose hairs, but it differs from
The studied population differs from B. villosa subsp. brevisiliqua in terms of the morphology and thickness of the basal leaves, the diameter of the seeds, and the habit of the reproductive plants, since the former shows long flowering and fruiting branches
Summary
Brassica is one of 321 genera of the Brassicaceae family, Tribe Brassiceae [1], comprising very variable species, both morphologically and genetically, which are widely utilized for human nutrition, mainly as vegetables, condiments, and edible oils. The genus Brassica, including 38 annual or perennial species [1], is divided into three sections: (1) sect. Brassica consists of 14 species (with several subspecies) characterized by x = 9 genome, a suffrutescent perennial habit, large size (up to two meters tall when flowering), flowers with yellow–white petals, cylindrical or subcylindrical/tetragonous fruits (siliques), globose and reticulate seeds. The populations occur mainly around the Mediterranean basin, from Israel and Lebanon in the East to the Canary
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