However, in a recent regional review of the state of herpetofauna, 30.8 per cent of the 13 amphibian species and 13.9 per cent of the 101 reptile species of Morocco were reported to be Threatened, while two species were reported to be Regionally Extinct. As of December 2012, the Global Invasive Species Database (GISD) lists 34 alien species (table 9.2) and an additional four species of unspecified biostatus. Other literature sources indicate other IASs not listed in the GISD source, e.g. the silver-leaved nightshade (Solatium elaeagnifolium) which competes with various crops, resulting in losses within Morocco of up to 64 per cent in maize without treatment and 78 per cent in cotton, and in a 25 per cent loss of value in infested fields.