Concise Bible Dictionary:

This is mentioned only in Luke 17:66And the Lord said, If ye had faith as a grain of mustard seed, ye might say unto this sycamine tree, Be thou plucked up by the root, and be thou planted in the sea; and it should obey you. (Luke 17:6); and as the same writer speaks also of the sycamore tree, the two are deemed to be distinct. The sycamore is supposed to be the mulberry, still called in Greece sycamenia. Both the black and white mulberry (Morns nigra and alba) are common in Palestine, their leaves being the food of silkworms.