- Sacaton Grass
- Sage
- Autumn, Chihuahuan
- Big
- Garden
- Mexican Bush
- Scarlet
- Texas
- Sagebrush
- Sago Palm
- Saltbush
- Salvia
- Sand Dropseed
- Sand Lovegrass
- Sandreed, Prairie
- Sand Verbenas
- Sawara Cypress
- Scarlet Gilia
- Scarlet Sage
- Schwedler Maple
- Scorpionflowers
- Scotch
- Sea Pink
- Sedge, Leather Leaf
- Sedum
- Senna, Desert
- Sensitive Briar
- Serviceberry
- Shadscale
- Sheep Fescue
- Shining Sumac
- Shiny Xylosma
- Shoestring Acacia
- Shooting Star
- Shrubby Cassia
- Siberian
- Sierra Lupine
- Silver
- Beardgrass
- Carpet
- Chollas
- Fir
- Grass
- King
- Lace Vine
- Maple
- Spread
- Silver-leaf Cassia
- Silverberry
- Silverbush
- Silvery Cassia
- Skyrocket
- Sleepygrass
- Smooth Sumac
- Snapdragon
- Snow-in-Summer
- Snowberry
- Soaptree Yucca
- Soapwort
- Sotol
- Southwest White Pine
- Spanish
- Spectacle Pod
- Speedwell
- Spiderwort, Western
- Spirea
- Sprenger Asparagus
- Spruce
- Bird's Nest
- Colorado
- Colorado Blue
- Norway
- Spurge, Japanese
- Squawbush
- Saint Johnswort
- Stachys
- Staghorn
- Standing Cypress
- Star Jasmine
- Stock
- Stonecrop
- Strawberry
- Streambank Wheatgrass
- Subalpine Fir
- Sugar
- Sugarberry
- Sulfur Buckwheat
- Sumac
- Fragrant
- Shining
- Smooth
- Staghorn
- Tiger Eyes (Rhus typhina)
- Summer Lilac
- Sundrops
- Sunflower
- Sunray
- 'Swan Hill' Olive
- Sweet
- Acacia
- Alyssum
- Grass
- Myrtle
- Pea
- William
- Sycamore
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