The Maltese islands are home to a wide diversity of indigenous, sub-endemic and endemic plants. They feature many traits typical of a Mediterranean climate, such as drought resistance. The most common indigenous trees on the islands are olive (''Olea europaea''), carob (''Ceratonia siliqua''), fig (''ficus carica''), holm oak (''Quericus ilex'') and Aleppo pine (''Pinus halepensis''), while the most common non-native trees are eucalyptus, acacia and opuntia. Endemic plants include the national flower ''widnet il-baħar'' (''Cheirolophus crassifolius), sempreviva ta' Malta (Helichrysum melitense),'' ''żigland t' Għawdex (Hyoseris frutescens'') and ''ġiżi ta' Malta'' (''Matthiola incana subsp. melitensis'') while sub-endemics include ''kromb il-baħar'' (''Jacobaea maritima subsp. sicula'') and ''xkattapietra'' (''Micromeria microphylla''). The flora and biodiversity of Malta is severely endangered by habitat loss, invasive species and human intervention. 