Find cluster numbers of a colored dendrogram

I understand how to generate a colored dendrogram whereby a cutoff criterion is chosen and generated using 'ColorThreshold'.

However, how do you fisure out which color belongs to whioch cluster?

for clarity i use;

%% calculate cluster membership using the desired number of clusters

clusters = cluster(tree, 'maxclust', numClust);

%% find colour threshold to cut dendrogram

colour = tree(end-numClust+2,3)-eps;

%% find optmal leaf order

leafOrder = optimalleaforder(tree,D);

%% plot dendrogram

[H, T, outperm] = dendrogram(tree,'ColorThreshold',colour, 'reorder', leafOrder);

Bu i cannot find a way to know which color corresponds to which cluster.