This taxon is known mostly from mid-Atlantic states to the Ohio Valley and southern Great Lakes (F). These plants differ from typical flagellaris in having dense glands on pedicels, rachises, petioles and often canes. Most colls. from Ky. have been referred to R. kentuckiensis Bailey, which is combined here and by several previous authors (M, K). Some relatively hairy colls., mapped here as uncertain records, have been referred to R. invisus (Bailey) Britt. (BULL, CLAR, MADI, MCRE), R. exsularis Bailey (CLAY), R. deamii Bailey (= R. rosagnetis Bailey; JACK, NELS, OLDH) or R. centralis (MCRE). All of these glandular plants have been united by Gl, St and others under R. invisus, which itself had been initially described as R. flagellaris var. invisus Bailey. Further revision is needed.