22a. Cuscuta gronovii Willdenow var. gronovii
[F W]
Calyces 1/2 corolla tube length, lobes ovate to suborbiculate, bases overlapping. Corollas: tube campanulate, 1.5–2.5 mm, lobes 1/3 tube length. Capsules loosely surrounded by withered corolla. 2n = 30.
Flowering Jun–Nov. Hosts: Acanthaceae, Anacardiaceae, Apiaceae, Asteraceae, Balsaminaceae, Betulaceae, Bignoniaceae, Brassicaceae, Caprifoliaceae, Commelinaceae, Convolvulaceae, Cornaceae, Euphorbiaceae, Fabaceae, Lamiaceae, Polygonaceae, Primulaceae, Rosaceae, Rubiaceae, Solanaceae, Urticaceae, Verbenaceae, Vitaceae, and others (M. Costea and F. J. Tardif 2006); wetland margins, wet forests; 20–300 m; Alta., Man., N.B., N.S., Ont., P.E.I., Que., Sask.; Ala., Ariz., Ark., Colo., Conn., D.C., Fla., Ga., Idaho, Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Mont., Nebr., N.H., N.J., N.Y., N.C., N.Dak., Ohio, Okla., Oreg., Pa., R.I., S.C., S.Dak., Tenn., Tex., Utah, Vt., Va., W.Va., Wis.; West Indies; introduced in Europe.
In the flora area, var. gronovii is the third most widespread dodder after Cuscuta campestris and C. indecora. Rarely, some plants may have capsules apically narrowed into a neck to 1 mm, reminiscent of C. rostrata.
Variety gronovii is a weed in cranberry crops in Massachusetts, New Jersey, and Wisconsin.
