Segnalazione per la flora siciliana di Trifolium ornithopodioides L. (Fabaceae) e revisione della sua area di distribuzione.

Trifolium ornithopodioides (L.) Sm. (Fabaceae) a new record for the Sicilian flora – T. ornithopodioides, a rare element of the Italian flora, is recorded for the first time in the territory of Palermo (Western-Sicily). The population identified, consisting of about one hundred individuals, colonizes a narrow area between the roadside and the edge of the freshwater temporary pond of Rebuttone, on acidic substratum (flysch) at 720 m a.s.l. After the examination of herbarium specimens (RO and FI) and literature, some incongruences have been found on the Italian distribution of this taxon. A distribution map including the new record, new literature data and corrections is presented.