Judith Browning wrote:Here's a bit more https://www.metmuseum.org/about-the-met/conservation-and-scientific-research/projects/identifying-natural-dyes
Among reference samples analyzed in this study, "zacatlaxcalli" 1 and "parasita from Mexico" 2 showed a chromatographic profile similar to that of the yellow sample from the tapestry. These reference samples are dyed with species of Cuscuta, one of the natural yellow dyes recorded as having been used in Mexico.........
Interesting! And I also note the reference to one species of Cuscuta (dodder) seeds being used medicinally in China.
So that got me to look in two of my most extensive herbals.
Native American Medicinal Plants lists four species of dodder where they are said to have been used for black widow bites, nosebleeds, bruises, as a ceremonial emetic, and "used by girls to divine the sincerity of suitors."
The Herb Society of America Encyclopedia of Herbs & Their Uses mentions there are 100 species belonging to the genus, with several being used medicinally: for melancholy diseases, disorders of spleen, kidneys, and liver. Used in Ayurvedic medicine as an alternative, purgative, carminative, and anthelmintic. Apparently, it is the seeds that are used.