The plant species of Israel were scored for an additive index, summarizing values of four parameters:
1. Rarity – The number of sites (1 km2) where the species is present. A rare species is defined when present in 0.5% of the area or less.
2. Declining rate and habitat vulnerability – Evaluate the decreasing rate in the number of sites and/or the destruction probability of the habitat.
3. Attractivity – the flower size and the probability of cutting or exploitation of the plant.
4. Distribution type – scoring endemic species and peripheral populations.
370 species, 16.15% of the Israeli flora entered into the “Red List.”