sycamine tree

Boyd’s Bible Dictionary:

(Luke 17:6). [SYCAMORE.]

Concise Bible Dictionary:

This is mentioned only in 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.
 
Mulberry Tree

Strong’s Dictionary of Greek Words:

Number:
4807 (find all occurrences in KJV Bible)
Greek:
συκάμινος
Transliteration:
sukaminos
Phonic:
soo-kam’-ee-nos
Meaning:
of Hebrew origin (8256) in imitation of 4809; a sycamore-fig tree
KJV Usage:
sycamine tree