Trees
Trees are plants growing over 15ft tall with woody stems that live for many years. Shrubs also have woody stems but grow less than 15ft tall; they are included in their respective flower color/shape pages.
Apricot
Prunus armeniaca
Aspen
Populus tremuloides
Black Locust
Robinia pseudoacacia
Bog Birch
Betula glandulosa
Boxelder Maple
Acer negundo
Colorado Blue Spruce
Picea pungens
Cottonwood(2)
Populus spp.
Douglas Fir
Pseudotsuga menziesii
Engelmann Spruce
Picea englemannii
Juniper(5)
Juniperus spp.
Limber Pine
Pinus flexilis
Lodgepole Pine
Pinus contorta
Mountain Alder
Alnus incana tenufolia
Narrowleaf Hoptree
Ptelea trifoliata
Netleaf Hackberry
Celtis reticulata
New Mexico Olive
Forestiera pubescens
Northern Catalpa
Catalpa speciosa
Oak(3)
Quercus spp.
Piñon Pine
Pinus edulis
Ponderosa Pine
Pinus ponderosa
Rio Grande Cottonwood
Populus deltoides ssp. wislizeni
Rocky Mountain Birch
Betula occidentalis
Rocky Mountain Maple
Acer glabrum
Russian Olive
Elaegnus angustifolia
Siberian Elm
Ulmus pumila
Siberian Peashrub
Caragana arborescens
Single Leaf Ash
Fraxinus anomola
Snowball Tree
Viburnum opulus
Subalpine Fir
Abies bifolia
Tamarisk
Tamariz pentandra
Tatarian Honeysuckle
Lonicera tatarica
Western Chokecherry
Prunus virginiana
White Fir
Abies concolor
Wild Plum
Prunus americana
Willow(13)*
Salix spp.