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Scientific Name Common Name(s) Plant Category Image
Sorghastrum nutans Indian grass Native Plants, Ornamental Grass, Perennials
Sorghum halepense Johnsongrass Poisonous Plants
Sparaxis Harlequin flower, Wand flower Summer Bulbs
Sparaxis hybrids Harlequin Flower Spring Bulbs
Sparmannia africana African hemp Poisonous Plants
Spartina pectinata Cord grass Prairie Ornamental Grass
Spartium junceum Spanish broom Shrubs
Spathiphyllum spp. Peace lily, spathe flower Poisonous Plants
Spigelia marilandica Indian pink, pinkroot Herbs, Native Plants, Perennials, Poisonous Plants, Wildflowers
Spiraea cantoniensis Bridal-wreath spirea, Spirea, Reeves spirea (double) Shrubs
Spiraea fritschiana Fritschiana spirea, Korean spirea Shrubs
Spiraea japonica Japanese spirea Shrubs
Spiraea nipponica 'Snowmound' Snowmound spirea Shrubs
Spiraea prunifolia Bridalwreath spirea Shrubs
Spiraea thunbergii Breath of Spring spirea, Thunberg spirea Shrubs
Spiraea tomentosa Hardbark spirea, Hardhack, Spirarea, Steeplebush Native Plants, Shrubs
Spiraea trilobata Threelobe spirea Shrubs
Spiraea x bumalda Bumalda spirea Shrubs
Spiraea x bumalda 'Anthony Waterer' Anthony Waterer spirea Shrubs
Spiraea x cinerea 'Grefsheim' Grefsheim spirea Shrubs
Spiraea x vanhouttei Vanhoutte spirea Shrubs
Spiranthes cernua Nodding ladies tresses Wildflowers
Spiranthes lacera var. gracilis Slender ladies tresses Wildflowers
Spiranthes tuberosa var. gracilis Little ladies tresses Wildflowers
Spodiopogon sibiricus Frost grass, Siberian graybeard, Spodiopogon Ornamental Grass
Sporobolis airoides Alkali dropseed Ornamental Grass
Sporobolus heterolepisis Prairie droopseed Ornamental Grass
Sprekelia Aztec lily, Jacobean lily, St. James lily Summer Bulbs
Stachys byzantina Lamb's ear, Lamb's-ears Groundcover, Herbs, Perennials
Stachys tenuifolia Smooth hedge-nettle Wildflowers
Stachyurus praecox Stachyurus Shrubs
Staphylea colchica Colchis bladdernut Trees
Staphylea holocarpa Chinese bladdernut Shrubs
Staphylea pinnate European bladdernut Trees
Staphylea trifolia American bladdernut Native Plants, Shrubs, Trees
Staphylea x 'Elegans' Elegans bladdernut Trees
Stellaria media chickenwort, chickweed, common chickweed, winterweed Annuals, Edible Plants
Stellaria pubera Giant chickweed, Star chickweed Edible Plants, Wildflowers
Stenanthium gramineum Feather bells Wildflowers
Stephanandra incisa Cutleaf stephanandra, Lace shrub Shrubs
Stephanotis floribunda Madagascar jasmine Vines
Sternbergia Fall daffodil, Winter daffodil, Yellow Autumn crocus Summer Bulbs
Stewarta rostrata Upright stewarta Shrubs
Stewartia koreana Korean stewartia Trees
Stewartia malacodendron Sewartia, Silky camellia Native Plants, Shrubs, Trees
Stewartia monadelpha Hime-syara stewartia, Tall stewartia Trees
Stewartia ovata Mountain camellia Native Plants, Shrubs, Trees
Stewartia pseudocamellia Japanese stewartia Trees
Stewartia rostrata Upright stewartia Trees
Stipa tenacissima Esparto grass, Mexican feather grass, Needle grass Ornamental Grass