I live in the Lot département of SW France.

I sometimes find broomrapes whose host appears to be an Eryngo, perhaps Eryngium campestre.

I find no references to this host plant for any member of the Orobanchaceae. And yes, I know that the host plant can't always be seen, but I see this several times each year. The broomrape isn't a blue one. (I have seen Branched broomrape in SW France - this blue.)

Any comments?

I wasn't too sure how this topic relates to astronomy, but someone will no doubt enlighten me .....