Tristerix longebracteatus photographed on the Cotopaxi Volcano of Ecuador, c. 3800m. Tristerix is a genus of 11 species of South American Loranthaceae (tropical mistletoe family), with striking hummingbird-pollinated flowers. This species parasitizes shrubs in the paramo of the high Andes. Paramo is a vegetation type above the treeline that consists of cold resistant shrubs and tussock grasses.
Photography resource link (by Daniel): Photomacrography.net is dedicated to macro photography, and includes user forums and some articles. It skews toward insect photography, but the techniques remain the same as for plants.