This is about two weeks prior to the maturation of the flowers of "Acer saccharum". The larvae feed on "Acer rubrum" and "Acer saccharum". The national champion for "Acer saccharum" is located in Charlemont, Massachusetts. Other species such as sugar maple ("Acer saccharum"), fir and spruce also grow further north. The sap often is harvested from the sugar maple, "Acer saccharum". Northern hardwood forests include sugar maple ("Acer saccharum") and American beech. The state tree is the sugar maple ("Acer saccharum"), effective in 1949. It is also frequently confused with the more distantly related "Acer saccharum" (sugar maple). The riparian forest contains tsuga (hemlock), betula alleghaniensis (yellow birch) and acer saccharum (sugar maple). "Acer saccharum" is among the most shade tolerant of large deciduous trees. Sugar maple (Acer Saccharum); and Alsace Street&colon; American Elm (Ulmus Americana). "Betula alleghaniensis" (yellow birch), "Betula papyrifera" (paper birch), and "Acer saccharum" (sugar maple). Other trees can be sugar maple ("Acer saccharum"), eastern red-cedar ("Juniperus virginiana"), or pines.