Rubber Euphorbia 'Red Pencil Tree' Rubber Plant, Small-leaved (spp.)
Rubber Plant, Small-leaved 'Indigo' Rubber Plant, Small-leaved 'Jacqueline'
Rubber Plant, Small-leaved 'Monique' Rubber Plant, Small-leaved 'Spire'
Rubber Plant, Small-leaved Variegated Rubber Tree (spp.)
Rubber Tree 'Decora' Rubber Tree 'Doescheri'
Rubber Tree, Hardy Rubber Tree, India (spp.)
Rubber Tree, India 'Decora' Rubber Tree, India 'Doescheri'
'Rubra' Star Magnolia 'Rubro-petiolata' Red Horsechestnut
'Ruby' Katsura Tree Ruby Red Horsechestnut (spp.)
Ruby Red Horsechestnut 'Briotii' Ruby Red Horsechestnut 'Rubro-petiolata'
'Ruby Teardrops' Colorado Spruce 'Russet' Southern Magnolia
Russian Hawthorn Russian Juniper
Russian Olive 'Rustica Rubra' Saucer Magnolia: soulangianahybrid
Rusty Black Viburnum (spp.) Rusty Black Viburnum 'Emerald Charmô'
Rusty Blackhaw (spp.) Rusty Blackhaw 'Emerald Charmô'
Rusty Fig (spp.) Rusty Fig Variegated
Rusty Jacket Rusty Kurrajong
'Ryusen' Japanese Maple 'Ryuzu' Japanese Maple
Sachalin Corktree Sachalin Spruce
Sacred Fig 'Sagara nishiki' Japanese Maple
Saho Palm 'Saint Mary' Southern Magnolia
Sakhalin Fir 'Saku' Japanese Maple
Salt Bush Salt-water Paperbark
'Samuel Sommer' Southern Magnolia 'Samurai' China Fir
San Bartolome 'San Jose' Holly
Sand Live Oak Sand Pear
Sand Pine Sandbox Tree
Sandmat Manzanita 'Sango kaku' Japanese Maple
Sanguinaria 'Sanguineum' Japanese Maple
Santa Cruz Kauri Santa Lucia Fir
Santa Maria Santa Maria: calaba
'Santa Rosa' Laurel Magnolia Sapodilla
'Sapporo Autumn Gold' Hybrid Elm 'Sara-Sa' Japanese Camellia
'Saratoga' Ginkgo Sargent Cherry (spp.)
Sargent Cherry 'Columnaris' Sargent Crabapple 'Tina'
'Sargentii' Ohio Buckeye Saskatoon Serviceberry (spp.)
Sassafras Sassafras, Chinese
Sassafras, Common Satin Leaf
Satin Wood Satinash, Cherry
Satinash, Rose 'Satinleaf' Southern Magnolia
Satinwood Satsuma Orange
'Satyr Hill' American Holly Saucer Magnolia 'Leonard Messel'
Saucer Magnolia: soulangianahybrid (spp.) Saucer Magnolia: soulangianahybrid 'Alexandrina'
Saucer Magnolia: soulangianahybrid 'Amabilis' Saucer Magnolia: soulangianahybrid 'Coates'
Saucer Magnolia: soulangianahybrid 'Joe McDaniel' Saucer Magnolia: soulangianahybrid 'Lennei'
Saucer Magnolia: soulangianahybrid 'Lennei Alba' Saucer Magnolia: soulangianahybrid 'Orchid'
Saucer Magnolia: soulangianahybrid 'Picture' Saucer Magnolia: soulangianahybrid 'Pristine'
Saucer Magnolia: soulangianahybrid 'Purple Prince' Saucer Magnolia: soulangianahybrid 'Rustica Rubra'
Saucer Magnolia: soulangianahybrid 'Speciosa' Saucer Magnolia: soulangianahybrid 'Triumphans'
Sausage Tree 'Savannah' Topal Holly