Castilleja miniata, C. rhexiifolia, and C. sulphurea form hybrid swarms. Tangled Trio: http://www.amjbot.org/cgi/content/full/96/8/1519
This list them by sub-genus. Those in the same subgenus should cross. Between sub-genera there might be no seed or the seed may not grow or some may lack chlorophyll. Since they are hemi-parasitic white may not be a problem. http://www.phylodiversity.net/dtank/Tank_Lab/Publications_files/Syst%20Bot%202009%20Tank.pdf There are white Ericaeae. Monotropa which had been a fungus is now a white plant living with Lactarius or Russula. -- Larry Wallace Cincinnati
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