Stems erect or nearly so, to 1 m, heavily armed with stout, straight or hooked prickles from a widely expanded base; primocane lvs 3(5)-foliolate, on a strongly armed petiole; terminal lfl seldom over 5 cm, rhombic to obovate, widest well above the middle, truncate to rounded or broadly obtuse, short-apiculate, or rarely merely acute, cuneate from the broadest part with nearly straight margins to the base, simply serrate in the distal half with rather broad low teeth, entire in the basal half, densely white- or gray-tomentose beneath; infl of usually 1-3 fls on ascending pedicels, all or mostly subtended by lvs with expanded blade. Dry, sandy soil, chiefly on the coastal plain; Conn. and L.I. to Fla. and Ala.; disjunct in Hillsboro Co., N.H. May-July. (R. longii; R. sejunctus)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.