+ treegroup["odum"] = "odum";
+ treegroup["canberra"] = "canberra";
+ treegroup["structeuclidean"] = "structeuclidean";
+ treegroup["structchord"] = "structchord";
+ treegroup["hellinger"] = "hellinger";
+ treegroup["manhattan"] = "manhattan";
+ treegroup["structpearson"] = "structpearson";
+ treegroup["structkulczynski"] = "structkulczynski";
+ treegroup["structchi2"] = "structchi2";
+ treegroup["soergel"] = "soergel";
+ treegroup["spearman"] = "spearman";
+ treegroup["speciesprofile"] = "speciesprofile";
+ treegroup["hamming"] = "hamming";
+ treegroup["gower"] = "gower";
+ treegroup["memchi2"] = "memchi2";
+ treegroup["memchord"] = "memchord";
+ treegroup["memeuclidean"] = "memeuclidean";
+ treegroup["mempearson"] = "mempearson";
+