sympetalæ

from The Century Dictionary.

• A division of dicotyledonous plants embracing all those having a double floral envelop (calyx and corolla) with the parts of the inner (corolla) united, at least at the base. It is therefore coextensive with the Metachiamydeæ, because that series, unlike the series Archichlamydeæ, is not further subdivided, but it has a lower taxonomic rank, namely, that of a division. See Metachlamydeæ and Gamopetalæ.