Spider Lily, Carribean Spider Lily: latifolia
Spider Milkweed Spiderlily (spp.)
Spiderwort, Cobweb Spiderwort, Hybrid (spp.)
Spiderwort, Mrs. Loewer's 'Mrs. Loewer' Spiderwort, Ohio 'Mrs. Loewer'
Spiderwort, Prairie Spiderwort, Virginia (spp.)
Spiked Blazing Star (spp.) Spiked Blazing Star 'Floristan Violet'
Spiked Blazing Star 'Kobold' Spiked Blazing Star White
Spiked Gayfeather (spp.) Spiked Gayfeather 'Floristan Violet'
Spiked Gayfeather 'Kobold' Spiked Gayfeather White
Spineless Cactus Spineless Century Plant (spp.)
Spineless Century Plant 'Nova' Spineless Prickly Pear
Spineless Yucca Spineless Yucca: recurvifolia
Spiraea, Rock Spirea, Rose
Spirea, Western Spleenwort Fern
Spleenwort, Ebony 'Splendens' Coral Bells: sanguinea
'Splendens' Sea Thrift Split Leaf Philodendron
Spoon Flower Spotted Bee Balm
Spotted Wintergreen Spreading Sedge 'Bunny Blue™'
Spreading Sedum Spreading Stonecrop
Spring Beauty: virginica 'Spring Charm' Fringed Rockcress
Spring Herald 'Spring Valley' Ceanothus: hybrid
Spruce Pine Spruce, Black Hills (spp.)
Spruce, Black Hills 'Blue Alberta' Spruce, Black Hills 'Cecilia'
Spruce, Black Hills Golden Spruce, Black Hills 'Rainbows End'
Spruce, Black Hills 'Sanders Blue' Spruce, Black Hills Weeping
Spruce, Black Hills 'Wild Acres' Spruce, Black (spp.)
Spruce, Black 'Beissneri' Spruce, Black Dwarf
Spruce, Black 'Pygmaea' Spruce, Blue (spp.)
Spruce, Blue 'Argentea' Spruce, Blue 'Bakeri'
Spruce, Blue Dwarf Blue Spruce, Blue 'Endtz'
Spruce, Blue 'Erich Frahm' Spruce, Blue 'Fat Albert'
Spruce, Blue 'Glauca Compacta' Spruce, Blue 'Glauca Globosa'
Spruce, Blue 'Globosa' Spruce, Blue Golden
Spruce, Blue 'Hoopsii' Spruce, Blue 'Iseli Fastigiata'
Spruce, Blue 'Iseli Foxtail' Spruce, Blue 'Koster'
Spruce, Blue 'Moerheimii' Spruce, Blue 'Montgomery'
Spruce, Blue 'Prostrate Blue Mist' Spruce, Blue 'Ruby Teardrops'
Spruce, Blue 'St. Mary's Broom' Spruce, Blue 'Thompsen'
Spruce, Blue 'Thume' Spruce, Brewer's
Spruce, Canadian (spp.) Spruce, Canadian 'Blue Alberta'
Spruce, Canadian 'Cecilia' Spruce, Canadian Golden
Spruce, Canadian 'Rainbows End' Spruce, Canadian 'Sanders Blue'
Spruce, Canadian Weeping Spruce, Canadian 'Wild Acres'
Spruce, Colorado Blue Spruce, Colorado (spp.)
Spruce, Colorado 'Argentea' Spruce, Colorado 'Bakeri'
Spruce, Colorado Dwarf Blue Spruce, Colorado 'Endtz'
Spruce, Colorado 'Erich Frahm' Spruce, Colorado 'Fat Albert'
Spruce, Colorado 'Glauca Compacta' Spruce, Colorado 'Glauca Globosa'
Spruce, Colorado 'Globosa' Spruce, Colorado Golden
Spruce, Colorado 'Hoopsii' Spruce, Colorado 'Iseli Fastigiata'
Spruce, Colorado 'Iseli Foxtail' Spruce, Colorado 'Koster'
Spruce, Colorado 'Moerheimii' Spruce, Colorado 'Montgomery'
Spruce, Colorado 'Prostrate Blue Mist' Spruce, Colorado 'Ruby Teardrops'
Spruce, Colorado 'St. Mary's Broom' Spruce, Colorado 'Thompsen'
Spruce, Colorado 'Thume' Spruce, Englemann
Spruce, Red Spruce, Sitka
Spruce, Swamp (spp.) Spruce, Swamp 'Beissneri'
Spruce, Swamp Dwarf Spruce, Swamp 'Pygmaea'
Spruce, Weeping Blue Spruce, White (spp.)
Spruce, White 'Blue Alberta' Spruce, White 'Cecilia'
Spruce, White Golden Spruce, White 'Rainbows End'
Spruce, White 'Sanders Blue' Spruce, White Weeping
Spruce, White 'Wild Acres' Spruce: pungens glauca, Blue