Mycoheterotrophic Plants

How many of them are there?

Genera Orchidacearum: Volume 3 Orchidoideae (Part 2) Vanilloideae

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith