The ornamental design for a treelamp, as shown and described.
FIG. 1 is a perspective view of a tree lamp showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a left view thereof;
FIG. 5 is a right view thereof;
FIG. 6 is an enlarged top view thereof;
FIG. 7 is an enlarged bottom view thereof;
FIG. 8 is an enlarged view of the encircled area 8 of FIG. 2;
FIG. 9 is an enlarged view of the encircled area 9 of FIG. 2; and,
FIG. 10 is an enlarged view of the encircled area 10 of FIG. 3.
The broken lines shown on the drawings depict portions of the tree lamp that form no part of the claimed design. The additional broken lines in the figures are demarcating enlarged areas and form no part of the claimed design.