A species of this annual shrub is found in Palestine, growing to the height of seven to nine feet, and with a stem one inch thick. Prof. Hacket, while examining a field of these plants, saw a bird of the air come and lodge in the branches before him, Matthew 13:31,32; Mark 4:31,32. Others suppose a tree is meant, called Salvadora Persica. It is found in Palestine, and bears berries containing small, mustard- like seeds. "A grain of mustard" was used proverbially to denote any thing extremely small, Matthew 17:20.