Protologue Description: IVA ORARIA sp. nov., fruticosa 0.5-1 m. altitudine; caulibus solum superiore parte ramosis, plus minusve subscabris; foliis plerumque oppositis, ovatis, obtusis vel acutis, profunde serratis; capitulis axilaribus deflexis pedicellatis depresso-globosis; involucro pentaphyllo vel raro hexaphyllo, ad maturitatem 6 mm. diametro; floribus fertilibus 5 aut raro 6; fructo 3-3.3 mm. longitudine. - Salt marches, New hampshire to New Jersey. Differs from I. frutescens in the larger size of the fruit, the greater diameter of the involucre, and the much broader leaves. Type, Bartlett 354 (Hb. Bartlett), collected on the banks of the Charles River, Boston, Massachusetts, 18 Spetember, 1905.