Rosa villosa L. 'Karpatika'
Rosa woodsii Lindl.
Roscoea alpina Royle.
Roscoea auriculata Schum.
Roscoea cautleyoides Gagnep.
Roscoea cautleyoides Gagnep. 'Jeffrey Thomas'
Roscoea humeana Balf. & Smith.
Roscoea purpurea Smith.
Roscoea purpurea Smith. 'Royal Purple Group'
Roscoea scillifolia (Gagnepain) E.J.Cowley
Roscoea tibetica Batalin
Roscoea x beesiana Cowley & C.Whitehouse
Rosularia davisii Muirhead
Rosularia globulariifolia (Fenzl) A. Berger
Rosularia haussknechtii (Boiss. & Reut.) A. Berger
Rosularia platyphylla (Schrenk) A.Berger
Rosularia rosulata (Edgeworth) H.Ohba
Rosularia sempervivum (Bieb.) A. Berger ssp. glaucophylla Eggli
Rosularia sempervivum (Bieb.) A. Berger ssp. libanotica (Labill.) Eggli
Rosularia sempervivum (Bieb.) A. Berger ssp. sempervivum
Rosularia turkestanica (Regel & C.Winkl.) A.Berger
Rudbeckia fulgida Aiton
Rudbeckia fulgida Aiton var. sullivantii (C.L.Boynton & Beadle) Cronquist
Rudbeckia laciniata L. 'Goldquelle'
Rudbeckia nitida Nutt. 'Herbstsonne'
Rudbeckia triloba L.
Ruellia humilis Nutt.
Rumex hydrolapathum Huds.
Rupicapnos africana (Lam.) Pomel.
Ruschia pulvinaris L. Bolus

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