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Scientific Name Common Name(s) Plant Category Image
Quercus spp. Oak Poisonous Plants
Quercus stellata Post oak Poisonous Plants, Trees
Quercus variabilis Oriental oak Poisonous Plants, Trees
Quercus virginiana Live oak Native Plants, Poisonous Plants, Trees
Ranunclus flammula Lesser spearwort, Minature spearwort Water Garden
Ranunculus Persian buttercup, Ranunculus Poisonous Plants, Summer Bulbs
Ranunculus carolinianus Carolina buttercup Poisonous Plants, Wildflowers
Ranunculus hybrids Persian Buttercup Poisonous Plants, Spring Bulbs
Ranunculus spp. Buttercup, crowfoot Annuals, Perennials, Poisonous Plants
Ratibida pinnata Gray-headed coneflower Wildflowers
Rhamnella franguloides Rhamnella Trees
Rhamnus caroliniana Carolina buckthorn Poisonous Plants, Trees
Rhamnus cathartica Common buckthorn Poisonous Plants, Trees
Rhamnus fragula Alder buckthorn, Glossy buckthorn Poisonous Plants, Shrubs
Rhamnus spp. Buckthorn Poisonous Plants
Rhaphiolepis indica Indian hawthorn Shrubs
Rhaphiolepis umbellata Indian hawthorn, Yeddo hawthorn Shrubs
Rhaphiolepis x delacourii Indian hawthorn Shrubs
Rhapidiophyllum hystrix Needle palm Shrubs
Rheum X cultorum (R. rhaponticum, R. rhabarbarum) Rhubarb Poisonous Plants
Rhexia virginica Meadow beauty Perennials, Wildflowers
Rhodochiton atrosanguineus Purple bell vine Vines
Rhododendron 'Ramapo' Ramapo rhododendron Poisonous Plants, Shrubs
Rhododendron 'Windbeam' Windbeam Poisonous Plants, Shrubs
Rhododendron (PJM Group) PJM Rhododendron, Rhododendron Shrubs
Rhododendron alabamense Alabama azalea Poisonous Plants, Shrubs
Rhododendron arborescens Smooth azalea, Sweet azalea Native Plants, Poisonous Plants, Shrubs
Rhododendron atlanticum Coastal azalea, Dwarf azalea Native Plants, Poisonous Plants, Shrubs
Rhododendron austrinum Florida azalea Native Plants, Poisonous Plants, Shrubs
Rhododendron bakeri Cumberland azalea Native Plants, Poisonous Plants, Shrubs
Rhododendron calendulaceum Flame azalea Native Plants, Poisonous Plants, Shrubs
Rhododendron canescens Hoary azalea, Piedmont azalea, Pinxter flower Native Plants, Poisonous Plants, Shrubs
Rhododendron carolinianum Carolina rhododendron, Punctatum Native Plants, Poisonous Plants, Shrubs
Rhododendron catawbiense Catawba rhododendron, Mountain rosebay, Purple rhododendron Native Plants, Poisonous Plants, Shrubs
Rhododendron eriocarpum Dwarf Indica (Gumpo) Azalea Groundcover, Poisonous Plants
Rhododendron flammeum Oconee azalea Native Plants, Poisonous Plants, Shrubs
Rhododendron Glenn Dale hybrids Glenn Dale Azalea Shrubs
Rhododendron hybrida Gunrei Satzuki Azalea Groundcover, Shrubs
Rhododendron kaempferi Kaempferi azaleas Poisonous Plants, Shrubs
Rhododendron Knaphill and Exbury hybrids Knaphill and Exbury Azaleas Shrubs
Rhododendron maximum Max, Rosebay rhododendron, White laurel Native Plants, Poisonous Plants, Shrubs
Rhododendron minus Dwarf rhododendron, Minus, Piedmont rhododendron Native Plants, Poisonous Plants, Shrubs
Rhododendron minus var. Chapmanii Chapman's rhododendron Poisonous Plants, Shrubs
Rhododendron minus var. minus Shrubs
Rhododendron mucronulatum Korean rhododendron Poisonous Plants, Shrubs
Rhododendron obtusum Hiryu azalea, Kurume azalea Poisonous Plants, Shrubs
Rhododendron periclymenoides Pinxter flower, Pinxterbloom azalea Native Plants, Poisonous Plants, Shrubs
Rhododendron prinophyllum Election pink azalea, Roseshell azalea Native Plants, Poisonous Plants
Rhododendron prinophyllum = R. roseum Election pink, Roseshell azalea Poisonous Plants, Shrubs
Rhododendron prunifolium Plum leaf azalea, Plumleaf azalea Native Plants, Poisonous Plants, Shrubs