 The sycamore may hybridise with other species in Acer section Acer , including with A. heldreichii where their natural ranges overlap and with A.velutinum. Intersectional hybrids with A. griseum ( Acer section Trifoliata ) are also known , in which the basal lobes of the leaf are reduced in size , making the leaves appear almost three @-@ lobed ( trifoliate ) . 
