This table lists all species profiled on PIER with the genus beginning with the letter R. An alphabetical index to all PIER species is also available. Also, the complete alphabetical of all PIER species is available, but it is a large list and may take a while to load on systems with slower internet connections. It includes those of environmental concern (including those that are probably of threat only to islands with high elevations) as well as agricultural and ruderal weeds. Each species is linked by its scientific name to an individual write-up containing relevant information.
Species are listed in alphabetic order. You can browse this list or use the "find" function on your web browser to search by scientific name.
Can't find it here? Check the list of synonyms for other names (the more common synonyms are included below) or search other lists and databases available on the Internet.
Stumped by botanical terms? Here are links to a brief glossary and a search engine for botanical terms.
| Scientific name (+Family) | Often-used other Latin names | Habit |
Present on
Pacific Islands? |
Primarily a threat
at high elevations? |
| Radermachera sinica (Bignoniaceae) | Stereospermum sinicum Hance | tree | Yes | No |
| Ranunculus muricatus (Ranunculaceae) | herb | Yes | Yes | |
| Ranunculus parviflorus (Ranunculaceae) | herb | Yes | Yes | |
| Ranunculus repens (Ranunculaceae) | herb | Yes | No | |
| Raphanus raphanistrum (Brassicaceae) | herb | Yes | No | |
| Raphanus sativus (Brassicaceae) | herb | Yes | Yes | |
| Raphia farinifera (Arecaceae) | Raphia pedunculata P. Beauv.; Raphia ruffia (Jacq.) Mart.; Sagus farinifera Gaertn.; Sagus ruffia Jacq. | tree | Yes | No |
| Rapistrum rugosum (Brassicaceae) | herb | Yes | No | |
| Rauvolfia vomitoria (Apocynaceae) | shrub/tree | Yes | No | |
| Ravenala madagascariensis (Strelitziaceae) | tree | Yes | Yes | |
| Reinhardtia gracilis (Arecaceae) | Malortiea gracilis H. Wendl. | shrub | Yes | No |
| Rhaphiolepis indica (Rosaceae) | Crataegus indica L. | shrub | Yes | No |
| Rhaphiolepis umbellata (Rosaceae) | Laurus umbellata Thunb.; Rhaphiolepis japonica Siebold & Zucc. | shrub | Yes | No |
| Rhizophora mangle (Rhizophoraceae) | tree | Yes | No | |
| Rhododendron indicum (Ericaceae) | Azalea indica L. | shrub | Yes | No |
| Rhodomyrtus tomentosa (Myrtaceae) | shrub | Yes | No | |
| Rhus taitensis (Anacardiaceae) | Melanococca taitensis (Guillemin) Young; Rhus simaroubifolia A. Gray | shrub/tree | Yes | No |
| Rhynchosia minima (Fabaceae) | herb | Yes | No | |
| Rhynchospora caduca (Cyperaceae) | herb | Yes | No | |
| Richardia brasiliensis (Rubiaceae) | herb | Yes | No | |
| Richardia scabra (Rubiaceae) | Richardsonia scabra (L.) A. St.-Hil. | herb | Yes | No |
| Ricinus communis (Euphorbiaceae) | shrub | Yes | No | |
| Rivina humilis (Phytolaccaceae) | Rivina laevis L. | herb | Yes | No |
| Robinia pseudoacacia (Fabaceae) | tree | Yes | Yes | |
| Roldana petasitis (Asteraceae) | Cineraria petasitis Sims; Senecio petasitis (Sims) DC. | shrub | Yes | No |
| Rorippa indica (Brassicaceae) | herb | Yes | No | |
| Rosa laevigata (Rosaceae) | shrub | Yes | Yes | |
| Rosa multiflora (Rosaceae) | shrub | Yes | Yes | |
| Rosenbergiodendron formosum (Rubiaceae) | Gardenia mussaenda L. f.; Mussaenda formosa Jacq.; Randia formosa (Jacq.) K. Schum.; Randia mussaenda (L. f.) DC. | shrub/tree | Yes | No |
| Rotala indica (Lythraceae) | Peplis indica Willd. | aquatic herb | No | No |
| Rotala rotundifolia (Lythraceae) | Ammannia rotundifolia Buch.-Ham. ex Roxb. | aquatic herb | No | No |
| Rotheca myricoides (Lamiaceae) | Clerodendrum myricoides (Hochst.) Vatke; Clerodendrum ugandense Prain; Spironema myricoides Hochst. | shrub | Yes | No |
| Rotheca serrata (Lamiaceae) | Clerodendrum serratum (L.) Moon; Volkameria serrata L. | shrub | Yes | No |
| Rottboellia cochinchinensis (Poaceae) | Rottboellia exaltata L. f. | grass | Yes | No |
| Roystonea oleracea (Arecaceae) | Areca oleracea Jacq.; Roystonea venezuelana L.H. Bailey | tree | Yes | No |
| Roystonea regia (Arecaceae) | Euterpe ventricosa C. H. Wright; Oreodoxa regia Kunth; Palma elata W. Bartram; Roystonea elata (W. Bartram) F. Harper; Roystonea floridana O. F. Cook | tree | Yes | No |
| Rubus 'Marion' (Rosaceae) | shrub | No | No | |
| Rubus 'Natchez' (Rosaceae) | shrub | No | No | |
| Rubus 'Triple Crown' (Rosaceae) | shrub | No | No | |
| Rubus adenotrichos (Rosaceae) | shrub | Yes | No | |
| Rubus alceifolius (Rosaceae) | shrub | No | No | |
| Rubus argutus (Rosaceae) | Rubus penetrans L. H. Bailey | shrub | Yes | No |
| Rubus discolor (Rosaceae) | Rubus armeniacus Focke | shrub | Yes | No |
| Rubus ellipticus (Rosaceae) | shrub | Yes | Yes | |
| Rubus glaucus (Rosaceae) | shrub | Yes | Yes | |
| Rubus loganobaccus (Rosaceae) | Rubus ursinus var. loganobaccus (L. H. Bailey) L. H. Bailey | shrub | Yes | No |
| Rubus megalococcus (Rosaceae) | shrub | Yes | No | |
| Rubus moluccanus (Rosaceae) | shrub | Yes | No | |
| Rubus niveus (Rosaceae) | shrub | Yes | No | |
| Rubus rosifolius (Rosaceae) | shrub | Yes | No | |
| Rubus sieboldii (Rosaceae) | shrub | Yes | No | |
| Rubus ulmifolius (Rosaceae) | shrub | Yes | No | |
| Ruellia blechum (Acanthaceae) | Barleria pyramidata Lam.; Blechum brownei Juss.; Blechum pyramidatum (Lam.) Urb.; Ruellia blechum f. puberulum | herb | Yes | No |
| Ruellia brevifolia (Acanthaceae) | Ruellia graecizans Backer; Stephanophysum longifolium Pohl | herb | Yes | No |
| Ruellia brittoniana (Acanthaceae) | Ruellia coerulea Morong; Ruellia malacosperma Greenm.; Ruellia simplex C. Wright; Ruellia spectabilis Britton; Ruellia tweedieana Griseb. | herb | Yes | No |
| Ruellia devosiana (Acanthaceae) | herb | Yes | No | |
| Ruellia prostrata (Acanthaceae) | Dipteracanthus prostrata (Poir.) Nees | herb | Yes | No |
| Ruellia squarrosa (Acanthaceae) | Dipteracanthus squarrosus Fenzl | shrub | Yes | No |
| Ruellia tuberosa (Acanthaceae) | herb | Yes | No | |
| Rugoloa polygonata (Poaceae) | grass | Yes | No | |
| Rumex acetosella (Polygonaceae) | Acetosella vulgaris Fourr. | herb | Yes | Yes |
| Rumex brownii (Polygonaceae) | herb | Yes | No | |
| Rumex conglomeratus (Polygonaceae) | Rumex foliosus Rech. f. | herb | Yes | No |
| Rumex crispus (Polygonaceae) | herb | Yes | No | |
| Rumex obtusifolius (Polygonaceae) | herb | Yes | No | |
| Rumex pulcher (Polygonaceae) | herb | Yes | No | |
| Russelia equisetiformis (Plantaginaceae) | shrub | Yes | No | |
| Ruta chalepensis (Rutaceae) | Ruta bracteosa DC.; Ruta chalepensis var. bracteosa (DC.) Boiss. | herb | Yes | No |
| Ruttya fruticosa (Acanthaceae) | shrub | Yes | No |