Their leaves are 25 â `` 35 cm ( 10 â `` 14 in ) long and 6 â `` 10 cm ( 2 â `` 4 in ) across . These leaves have 9 or 10 pairs of veins . Their leaves are 25 â `` 35 cm ( 10 â `` 14 in ) long and 6 â `` 10 cm ( 2 â `` 4 in ) across , with 9 or 10 pairs of veins .