Index
- Randia aculeata, white indigo berry
- Ranunculus hispidus var. nitidus, swamp buttercup
- Ranunculus pusillus, low spearwort
- Ranunculus recurvatus, blisterwort
- Rapanea punctata, myrsine
- Raphanus raphanistrum, wild radish
- Rhamnus caroliniana, Carolina buckthorn
- Rhapidophyllum hystrix, needle palm
- Rhexia alifanus, tall meadow-beauty, savanna meadowbeauty
- Rhexia cubensis, meadow-beauty
- Rhexia lutea, yellow meadow-beauty
- Rhexia mariana, pale meadow-beauty, dull meadow-pitchers
- Rhexia nashii, Nash's meadow-beauty
- Rhexia nuttallii, Nuttal's meadow-beauty
- Rhexia parviflora, small flowered (white) meadow-beauty
- Rhexia petiolata, fringed meadow-beauty
- Rhexia virginica, Virginia meadowbeauty, handsome harry, wing-stem meadow-pitchers
- Rhipsalis baccifera, mistletoe cactus, pencil cactus
- Rhizophora mangle, red mangrove
- Rhododendron austrinum, orange azalea
- Rhododendron canescens, wild azalea, Piedmont azalea, pink azalea
- Rhododendron minus var. chapmanii, Chapman's rhododendron
- Rhododendron viscosum, swamp azalea
- Rhodomyrtus tomentosa, downy myrtle, rose myrtle
- Rhus aromatica, fragrant sumac
- Rhus copallina, winged sumac
- Rhus glabra, smooth sumac
- Rhynchelytrum repens, natalgrass
- Rhynchosia cinerea, brown-haired snoutbean
- Rhynchosia cytisoides, snoutbean, pinebarren pea, royal snoutbean
- Rhynchosia parvifolia, small-leaf snoutbean
- Rhynchosia reniformis, dollarweed, dollarleaf
- Rhynchospora chapmanii, Chapman's beakrush
- Rhynchospora ciliaris, cilicate beakrush
- Rhynchospora colorata, starrush whitetop
- Rhynchospora corniculata, short-bristle beakrush
- Rhynchospora fascicularis, fasciculate beakrush
- Rhynchospora floridana, Florida whitetop sedge, star-rush
- Rhynchospora grayi, Gray's beakrush
- Rhynchospora inundata, horned beakrush
- Rhynchospora latifolia, giant whitetop, sandswamp whitetop
- Rhynchospora macra, large beakrush
- Rhynchospora megalocarpa, sand beakrush
- Rhynchospora megaplumosa, longbristle beakrush
- Rhynchospora microcarpa, southern beakrush
- Rhynchospora microcephala, capotate beakrush
- Rhynchospora miliacea, millet beakrush
- Rhynchospora mixta, mingled beakrush
- Rhynchospora odorata, fragrant beakrush
- Rhynchospora oligantha, few-flower beakrush
- Rhynchospora pleiantha, coastal beakrush
- Rhynchospora tracyi, Tracy's beakrush
- Rhynchospora wrightiana, Wright's beakrush
- Ribes echinellum, Miccosukee gooseberry
- Richardia brasiliensis, richardia, Brazil pusley
- Richardia grandiflora, richardia
- Richardia humistrata, richardia
- Richardia scabra, richardia, Florida pusley
- Ricinus communis, castorbean
- Rivina humilis, rouge plant
- Robinia pseudoacacia, black locust
- Rorippa teres, marsh yellowcress
- Rosa carolina, Carolina rose
- Rosa laevigata, Cherokee rose
- Rosa multiflora, multiflora rose
- Rosa palustris, swamp rose
- Roystonea elata, royal palm
- Rubus argutus, highbush blackberry
- Rubus cuneifolius, sand blackberry
- Rubus flagellaris, northern dewberry
- Rubus trivialis, southern dewberry
- Rudbeckia graminifolia, grass-leaf coneflower
- Rudbeckia hirta, blackeyed-susan
- Rudbeckia laciniata, cut-leaved coneflower, goldenglow
- Rudbeckia mohrii, Mohr's coneflower
- Rudbeckia mollis, softhair coneflower
- Rudbeckia nitida, yellow (=shiny) coneflower
- Rudbeckia triloba var. pinnatiloba, pinnate-lobed coneflower
- Ruellia caroliniensis, Carolina wildpetunia
- Ruellia ciliatiflora, hairyflower wildpetunia
- Ruellia ciliosa, ciliate wildpetunia
- Ruellia noctiflora, night-flowering wildpetunia
- Ruellia tweediana, Mexican petunia, Britton's wild-petunia
- Rumex crispus, curly dock
- Rumex hastatulus, hastate-leaved dock
- Rumex obtusifolius, bitter dock
- Rumex verticillatus, swamp dock
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