Orchidoideae/Definition

It is a subfamily of Orchidaceae split into six tribes and several subtribes, encompassing 208 genera and 3630 species distributed almost all over the world, except in the dryer deserts and polar areas; Known for being orchids with coherent pollen forming pollinia, with one fertile anther, erect or bent back; convolute leaves but not very plicate; and roots ordinarily fleshy or tuberous.