Table of Contents

This work is a contribution to the knowledge of the vascular flora of the archipelago (SE Greece), which is part of the South Anatolian biogeographical province. An autumn survey (October 2025) identified nine species new for the archipelago (Amaranthus viridis, Dittrichia graveolens, Eclipta prostrata, Euphorbia prostrata, Gastridium phleoides, Orobanche minor, Portulaca oleracea, Setaria adhaerens, Sorghum halepense) and clarified the distribution of several taxa of great biogeographical interest (e.g. Campanula kastellorizana, Colchicum macrophyllum, Cyclamen maritimum, Dianthus muglensis, Polygonum praelongum, Thliphthisa brevifolia). A checklist is also presented for Aghios Georgios, a small satellite islet (1 ha) with a high species richness as 149 plant taxa have been recorded in total. The Kastellorizo archipelago, rich in about twenty endemic vascular plants, is a very interesting biogeographical entity that deserves increased protection of its biodiversity.

Euonymus europaeus (Celastraceae) is a deciduous forest tree species of Eurasian origin, widely distributed across Europe and western Asia, but hitherto unrecorded in North Africa. Recent botanical surveys carried out in the Babors Mountains (northeastern Algeria) have confirmed the presence of this species in three isolated mixed deciduous forests located between 700 and 1100 m a.s.l., including the Taza National Park and the forests of Tloudène and Tazegzeout. The identification is based on diagnostic morphological characters, particularly the non-winged capsules and the quadrangular young branches. Comparison with Euonymus latifolius var. kabylicus, the only taxon of the genus previously reported from Algeria, clearly supports the attribution of the studied populations to Euonymus europaeus. The restricted distribution of the species within relict montane forests, together with its absence from North African floristic literature, suggests an ancient native status, likely related to the role of the Babors Mountains as biogeographical refugia. This finding highlights the floristic and conservation value of the region and underlines the need for further botanical investigations in northeastern Algeria.

_

Résumé

Euonymus europaeus (Celastraceae) est une espèce arborée forestière à feuillage caduc, d'origine eurasiatique, largement répandue en Europe et en Asie occidentale, mais jusqu'à présent non signalée en Afrique du Nord. Des inventaires botaniques...