Continue west on 17th until you reach Stanyan Street, cross Stanyan, and turn right to head north on Stanyan As you cross the street, look to the left - almost the entire long block of Stanyan between 17th and Belgrave at the top of the hill is planted with American sweetgum trees, native from the Alleghenies through Mexico to Central America. The scientific name is Liquidambar styraciflua. These trees tend not to lose their leaves until the new leaves come in the Spring, so by December and January they are providing fall color.