Acer L.
Leaves compound, often pinnate, with 5–7 (but sometimes with only 3) leaflets. Flowers dioecious. Petals absent. Tree up to 6 m high. Naturalized along the Nepean River. Introd. from N. America. Box Elder Acer negundo
Leaves simple, palmately lobed. Flowers monoecious. Petals present. Disc absent. Tree up to 5 m high. Naturalized at Jenolan Caves. Introd. from Europe. Sycamore Acer pseudoplatanus