Also, another plant with two dragons in
Recueil de dessins de plantes is
Carlina (with the long stems, this is probably
Carlina vulgaris rather than C. acaulis).
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Element 106.
This is a spiny thistle and I'm not aware of any use for the sap. The leaves and roots are sometimes used medicinally, but it's really not high on the list of medicinal plants. Mostly the heart of the blooms are eaten as food (similar to artichoke) and even that is not prevalent.
So why are there dragons? It's a very spiny plant but I don't know if that would have any bearing. The African
Carlina has long, fairly thick snaky roots, but I'm not sure if that would inspire dragon pictures either.
Some thistles have sap that is more noticeable than others (e.g., Onocardium) but I don't recall any references to
Carlina sap and it's not a prominent feature of the plant.
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So there are two plants with double dragons (
Gentiana and
Carlina). One mentions sap, the other one doesn't and Carlina is not particularly known for its sap. The two plants are very different from one another. The only things I can think of that they have in common are 1) they both like to grow in fields and 2) both have somewhat thick tap roots that sometimes branch.