Parasitic species unable to photosynthesize. Connected with roots of their hosts and often very selective and host specific.. Some are crop pests, but have ben used as medecine in the past and could have interesting chmeical compounds still not discovered. Interesting in itself as an example of biodiversity and with a strange beauty also.
To look for the host is the easier way to reduce the list of candidates. There is a species from Trifolium (O. minor) that is similar in color but smaller than yours. Orobanche gracilis parasitize Chamaespartium but has brown red in the inner surface of the flowers. It seems that both hosts appear in the photo.