Cuscuta umbrosa Beyr. ex Hook., Fl. Bor. Amer. 2:78. 1840. Voucher; U.S.A. Colorado: Dome Rock in Platte Canyon, 7000 ft elevation, 8 Aug 1878, M. A. Jones 571 (RSA). = Cuscuta gronovii Willd. ex Roem. & Schult. var. curta Engelm., Trans. Acad. Sci. St. Louis 1:508. 1859. Cuscuta curta (Engelm.) Rydb., Bull. Torrey Bot. Club 40:466. 1913.  = Cuscuta megalocarpa Rydb., Bull. Torrey Bot. Club 28:501. 1901.  Want to know more about its nomenclature, typification, and taxonomy?