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Silverleaf Mountain Mint
Pycnanthemum incanum ✍
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Small Broomrape
Orobanche minor ✍
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Silverline Locoweed
Astragalus tephrodes ✍
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Small Celandine
Ranunculus ficaria
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Silverrod
Solidago bicolor
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Small Cranberry
Vaccinium oxycoccos
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Silversword, Haleakalā
Argyroxiphium sandwicense ssp. macrocephalum
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Small Hop Clover
Trifolium dubium
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Silverweed
Argentina anserina
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Small Purple Fringed Orchid
Platanthera psycodes
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Silverweed
Argentina egedii ✍
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Small Spotted Sandmat
Chamaesyce vermiculata
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Silverweed Cinquefoil
Argentina anserina
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Small White Aster
Symphyotrichum racemosum
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Silverweed, Eged’s
Argentina egedii ✍
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Small Yellow Lady’s Slipper
Cypripedium parviflorum var. parviflorum
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Silwerboom
Leucadendron argenteum ✍
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Small Yellow Onion
Allium flavum ✍
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Simpler’s Joy
Verbena hastata
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Small-flowered Agalinis
Agalinis paupercula ✍
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Simpson’s Grape
Vitis cinerea var. floridana
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Small-flowered Agrimony
Agrimonia parviflora
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Single-leaf Ash
Fraxinus anomala ✍
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Small-flowered Fiddleneck
Amsinckia menziesii var. intermedia
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Single-spored Map Lichen
Rhizocarpon disporum
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Small-flowered White Aster
Symphyotrichum racemosum
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Singleleaf Piñon
Pinus monophylla ✍
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Small-headed Sunflower
Helianthus microcephalus ✍
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Sitka Alder
Alnus viridis
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Small-toothed Dodder
Cuscuta denticulata ✍
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Sitka Spruce
Picea sitchensis ✍
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Smaller Forget-me-not
Myosotis laxa ✍
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Six-weeks Fescue
Vulpia octoflora ✍
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Smallflower Agave
Agave parviflora
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Skeleton Weed
Eriogonum deflexum ✍
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Smallflower Century Plant
Agave parviflora
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Skimmia, Japanese
Skimmia japonica ✍
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Small’s Ragwort
Packera anonyma ✍
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Skullcap, Allegheny
Scutellaria serrata ✍
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Smartweed, Carey’s
Polygonum careyi ✍
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Skullcap, Common
Scutellaria galericulata
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Smartweed, Dock-leaved
Polygonum lapathifolium
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Skullcap, Hooded
Scutellaria galericulata
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Smartweed, Longroot
Polygonum amphibium
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Skullcap, Marsh
Scutellaria galericulata
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Smartweed, Nodding
Polygonum lapathifolium
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Skullcap, Showy
Scutellaria serrata ✍
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Smartweed, Pale
Polygonum lapathifolium
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Skunk Cabbage
Symplocarpus foetidus
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Smartweed, Pennsylvania
Polygonum pensylvanicum ✍
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Skunk Meadowrue
Thalictrum revolutum
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Smartweed, Water
Polygonum amphibium
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Skunk Spruce
Picea glauca
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Smelling Stick
Sassafras albidum
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Skunkbrush
Rhus aromatica ✍
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Smirnow Rhododendron
Rhododendron smirnowii ✍
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Skunkbush
Rhus trilobata ✍
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Smock, Lady’s
Cardamine pratensis ✍
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Sky Blue Aster
Symphyotrichum oolentangiense ✍
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Smoke Tree
Psorothamnus spinosus
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Skyrocket, Long-flowered
Ipomopsis longiflora
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Smoke, Prairie
Geum triflorum
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Skyrocket, White-flower
Ipomopsis longiflora
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Smokethorn
Psorothamnus spinosus
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Slash Pine
Pinus elliottii ✍
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Smokethorn Dalea
Psorothamnus spinosus
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Sleder Glasswort
Salicornia depressa ✍
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Smoketree, American
Cotinus obovatus
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Sleeping Beauty
Oxalis corniculata
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Smoky-eye Boulder Lichen
Porpidia albocaerulescens ✍
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Slender Blue Flag
Iris prismatica
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Smooth Alder
Alnus serrulata
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Slender Bush Clover
Lespedeza virginica ✍
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Smooth Bedstraw
Galium mollugo
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Slender Fragrant Goldenrod
Euthamia caroliniana
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Smooth Beggartick
Bidens laevis
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Slender Glasswort
Salicornia depressa ✍
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Smooth Bidens
Bidens laevis
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Slender Goldentop
Euthamia caroliniana
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Smooth Black Sedge
Carex nigra
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Slender Mannagrass
Glyceria melicaria ✍
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Smooth Blackhaw
Viburnum prunifolium ✍
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Slender Rush
Juncus tenuis
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Smooth Blue American-aster
Symphyotrichum laeve
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Slender Speedwell
Veronica filiformis
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Smooth Blue Aster
Symphyotrichum laeve
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Slender Toothwort
Cardamine angustata
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Smooth Bur Marigold
Bidens laevis
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Slender Vetch
Vicia tetrasperma ✍
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Smooth Carrion Flower
Smilax herbacea
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Slender Willow Herb
Epilobium ciliatum
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Smooth Chain-fruit Cholla
Cylindropuntia fulgida var. fulgida
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Slim Milkweed
Asclepias linearis
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Smooth Desert Dandelion
Malacothrix glabrata
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Slime Mold
Fuligo septica
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Smooth Gerardia
Agalinis purpurea
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Slipper Plant
Pedilanthus macrocarpus ✍
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Smooth Goldenrod
Solidago gigantea
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Slipper, Lady’s
Cypripedium acaule
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Smooth Herbaceous Greenbrier
Smilax herbacea
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