NPSpecies Report Viewer

National Park Service
U.S. Department of the Interior

List of Acid Sensitive Species


Date Received:	1/31/2018
Data Source:	Horn KJ and Others. 2018. Growth and survival relationships of 71 tree species with nitrogen and sulfur deposition across the conterminous U.S. PLoS ONE. 13(10)
Description:	This is a list of tree species identified to have negative responses to acid deposition (sulfur and nitrogen) across their range. The responses are classified as reduced growth when increased deposition leads to a decline in the growth rate of a species and reduced survival when increased deposition leads to a reduced likelihood of survival of a species. The presence of an acid sensitive species alone does not predict damage in the park, but must be paired with the corresponding level of deposition. The amount of acid deposition that causes the response, as well as the intensity of the response, varies among species (Horn et al. 2018). Local environmental conditions, soil properties, and community composition may alter the species responses across parks, but when the critical load of a species is exceeded, a change in growth/survival is expected. The responses to deposition were calculated by evaluating changes in Forest Inventory and Analysis plot data from 2000 to 2015 along with temperature, precipitation, and modeled deposition data. The manuscript identified 66 species with a negative response which were compared to ITIS taxonomic synonyms, subspecies, and varieties to compose the list below. For a key matching the original species to the extended list, and identify associated critical loads, please go here .


Scientific Name	Common Name	Acid Sensitive	Reduced Survival	Reduced Growth
Abies amabilis	Pacific silver fir	Yes	No	Yes
Abies balsamea	balsam fir	Yes	Yes	Yes
Abies balsamea var. balsamea	balsam fir	Yes	Yes	Yes
Abies balsamea var. phanerolepis	Canaan fir	Yes	Yes	Yes
Abies concolor	white fir	Yes	Yes	Yes
Abies concolor var. concolor	Rocky Mountain fir, Rocky Mountain white fir, white fir	Yes	Yes	Yes
Abies engelmannii	Engelmann spruce	Yes	Yes	No
Abies excelsior	grand fir	Yes	No	Yes
Abies grandis	grand fir	Yes	No	Yes
Abies grandis var. grandis	grand fir	Yes	No	Yes
Abies grandis var. idahoensis	grand fir	Yes	No	Yes
Abies mariana	black spruce	Yes	Yes	No
Abies menziesii	Douglas-fir	Yes	No	Yes
Abies X phanerolepis	fir	Yes	Yes	Yes
Acer barbatum	sugar maple	Yes	Yes	No
Acer californica	box elder, California boxelder	Yes	Yes	Yes
Acer californicum	box elder, California boxelder	Yes	Yes	Yes
Acer carolinianum	red maple	Yes	Yes	Yes
Acer dasycarpum	silver maple	Yes	No	Yes
Acer drummondii	Drummond's maple	Yes	Yes	Yes
Acer interius	ash-leaf maple, boxelder, boxelder maple	Yes	Yes	Yes
Acer negundo	boxelder	Yes	Yes	Yes
Acer negundo ssp. californicum	box elder, California boxelder	Yes	Yes	Yes
Acer negundo ssp. interius	ash-leaf maple, boxelder, boxelder maple	Yes	Yes	Yes
Acer negundo ssp. latifolium	ashleaf maple, boxelder	Yes	Yes	Yes
Acer negundo var. arizonicum	Arizona boxelder	Yes	Yes	Yes
Acer negundo var. californicum	box elder, California boxelder	Yes	Yes	Yes
Acer negundo var. interius	ash-leaf maple, boxelder, boxelder maple	Yes	Yes	Yes
Acer negundo var. mexicanum	boxelder	Yes	Yes	Yes
Acer negundo var. negundo	ash-leaf maple, boxelder	Yes	Yes	Yes
Acer negundo var. texanum	ashleaf maple, boxelder	Yes	Yes	Yes
Acer negundo var. variegatum	ash-leaf maple, boxelder	Yes	Yes	Yes
Acer negundo var. violaceum	boxelder	Yes	Yes	Yes
Acer nigrum var. glaucum	sugar maple	Yes	Yes	No
Acer nigrum var. saccharophorum	sugar maple	Yes	Yes	No
Acer rubrum	red maple	Yes	Yes	Yes
Acer rubrum ssp. drummondii	Drummond's maple	Yes	Yes	Yes
Acer rubrum var. drummondii	Drummond's maple	Yes	Yes	Yes
Acer rubrum var. rubrum	red maple	Yes	Yes	Yes
Acer rubrum var. tomentosum	red maple	Yes	Yes	Yes
Acer rubrum var. tridens	red maple	Yes	Yes	Yes
Acer rubrum var. trilobum	red maple	Yes	Yes	Yes
Acer rugelii	sugar maple	Yes	Yes	No
Acer saccharinum	silver maple	Yes	No	Yes
Acer saccharinum var. laciniatum	silver maple	Yes	No	Yes
Acer saccharinum var. wieri	silver maple	Yes	No	Yes
Acer saccharophorum	sugar maple	Yes	Yes	No
Acer saccharum	sugar maple	Yes	Yes	No
Acer saccharum ssp. ozarkense	sugar maple	Yes	Yes	No
Acer saccharum ssp. schneckii	sugar maple	Yes	Yes	No
Acer saccharum var. glaucum	sugar maple	Yes	Yes	No
Acer saccharum var. rugellii	sugar maple	Yes	Yes	No
Acer saccharum var. saccharum	sugar maple	Yes	Yes	No
Acer saccharum var. schneckii	sugar maple	Yes	Yes	No
Acer stenocarpum	red maple	Yes	Yes	Yes
Andromeda arborea	sourwood	Yes	Yes	No
Andromeda arboreum	sourwood	Yes	Yes	No
Argentacer saccharinum	silver maple	Yes	No	Yes
Betula alba var. commutata	paper birch	Yes	Yes	Yes
Betula alleghaniensis	yellow birch	Yes	Yes	No
Betula alleghaniensis var. alleghaniensis	yellow birch	Yes	Yes	No
Betula alleghaniensis var. fallax	yellow birch	Yes	Yes	No
Betula alleghaniensis var. macrolepis	yellow birch	Yes	Yes	No
Betula lenta	sweet birch	Yes	Yes	Yes
Betula lenta var. lenta	sweet birch	Yes	Yes	Yes
Betula lutea	yellow birch	Yes	Yes	No
Betula lutea var. fallax	yellow birch	Yes	Yes	No
Betula lutea var. macrolepis	yellow birch	Yes	Yes	No
Betula papyrifera	paper birch	Yes	Yes	Yes
Betula papyrifera var. commutata	western paper birch	Yes	Yes	Yes
Betula papyrifera var. elobata	paper birch	Yes	Yes	Yes
Betula papyrifera var. macrostachya	paper birch	Yes	Yes	Yes
Betula papyrifera var. papyrifera	paper birch	Yes	Yes	Yes
Betula papyrifera var. pensilis	paper birch	Yes	Yes	Yes
Carpinus americana	American hornbeam	Yes	Yes	Yes
Carpinus betulus var. caroliniana	American hornbeam, musclewood	Yes	Yes	Yes
Carpinus betulus var. virginiana	American hornbeam	Yes	Yes	Yes
Carpinus caroliniana	American hornbeam, musclewood	Yes	Yes	Yes
Carpinus caroliniana ssp. caroliniana	American hornbeam	Yes	Yes	Yes
Carpinus caroliniana ssp. virginiana	American hornbeam	Yes	Yes	Yes
Carpinus caroliniana var. virginiana	American hornbeam	Yes	Yes	Yes
Carya glabra	pignut hickory	Yes	Yes	No
Carya glabra var. glabra	pignut hickory	Yes	Yes	No
Carya glabra var. hirsuta	pignut hickory	Yes	Yes	No
Carya glabra var. megacarpa	pignut hickory	Yes	Yes	No
Carya glabra var. odorata	red hickory	Yes	Yes	No
Carya leiodermis	pignut hickory	Yes	Yes	No
Carya magnifloridana	pignut hickory	Yes	Yes	No
Carya microcarpa	pignut hickory	Yes	Yes	No
Carya ovalis	pignut hickory	Yes	Yes	No
Carya ovalis var. hirsuta	pignut hickory	Yes	Yes	No
Carya ovalis var. mollis	pignut hickory	Yes	Yes	No
Carya ovalis var. obcordata	pignut hickory	Yes	Yes	No
Carya ovalis var. obovalis	pignut hickory	Yes	Yes	No
Carya ovalis var. odorata	pignut hickory	Yes	Yes	No
Carya X ovalis var. hirsuta	pignut hickory	Yes	Yes	No
Carya X ovalis var. odorata	pignut hickory	Yes	Yes	No
Celtis canina	hackberry	Yes	Yes	No
Celtis occidentalis	hackberry	Yes	Yes	No
Celtis occidentalis var. canina	common hackberry	Yes	Yes	No
Celtis occidentalis var. cordata	common hackberry, hackberry, western hackberry	Yes	Yes	No
Celtis occidentalis var. crassifolia	common hackberry, hackberry, western hackberry	Yes	Yes	No
Celtis occidentalis var. occidentalis	common hackberry, western hackberry	Yes	Yes	No
Celtis occidentalis var. pumila	common hackberry	Yes	Yes	No
Celtis pumila	hackberry	Yes	Yes	No
Celtis pumila var. deamii	hackberry	Yes	Yes	No
Cupressus disticha	baldcypress	Yes	Yes	Yes
Fagus americana	American beech	Yes	Yes	Yes
Fagus ferruginea	American beech	Yes	Yes	Yes
Fagus grandifolia	American beech	Yes	Yes	Yes
Fagus grandifolia ssp. heterophylla	American beech	Yes	Yes	Yes
Fagus grandifolia var. caroliniana	American beech	Yes	Yes	Yes
Fraxinus campestris	green ash	Yes	Yes	Yes
Fraxinus darlingtonii	green ash	Yes	Yes	Yes
Fraxinus lanceolata	green ash	Yes	Yes	Yes
Fraxinus nigra	black ash	Yes	No	Yes
Fraxinus pennsylvanica	green ash	Yes	Yes	Yes
Fraxinus pennsylvanica var. austinii	green ash	Yes	Yes	Yes
Fraxinus pennsylvanica var. integerrima	green ash	Yes	Yes	Yes
Fraxinus pennsylvanica var. lanceolata	green ash	Yes	Yes	Yes
Fraxinus pennsylvanica var. pennsylvanica	green ash	Yes	Yes	Yes
Fraxinus pennsylvanica var. subintegerrima	green ash	Yes	Yes	Yes
Fraxinus smallii	green ash	Yes	Yes	Yes
Gleditsia triacanthos	honeylocust	Yes	No	Yes
Gleditsia triacanthos var. inermis	common honeylocust, honey locust, honeylocust, honey-locust	Yes	No	Yes
Gleditsia triacanthus var. inermis	honeylocust	Yes	No	Yes
Hicoria austrina	pignut hickory	Yes	Yes	No
Hicoria glabra	pignut hickory	Yes	Yes	No
Hicoria glabra var. hirsuta	pignut hickory	Yes	Yes	No
Hicoria ovalis	pignut hickory	Yes	Yes	No
Ioxylon pomiferum	Osage-orange	Yes	No	Yes
Juglans nigra	black walnut	Yes	No	Yes
Juniperus barbadensis	coast juniper, coastal redcedar, southern redcedar, southern red-cedar	Yes	Yes	Yes
Juniperus californica ssp. osteosperma	Utah juniper	Yes	No	Yes
Juniperus californica var. osteosperma	Utah juniper	Yes	No	Yes
Juniperus californica var. osterosperma	Utah juniper	Yes	No	Yes
Juniperus californica var. utahensis	Utah juniper	Yes	No	Yes
Juniperus knighti	Utah juniper	Yes	No	Yes
Juniperus knightii	Utah juniper	Yes	No	Yes
Juniperus lucayana	coast juniper, coastal redcedar, southern redcedar, southern red-cedar	Yes	Yes	Yes
Juniperus megalocarpa	Utah juniper	Yes	No	Yes
Juniperus monosperma	oneseed juniper	Yes	No	Yes
Juniperus monosperma var. knightii	Utah juniper	Yes	No	Yes
Juniperus occidentalis var. gymnocarpa	oneseed juniper	Yes	No	Yes
Juniperus occidentalis var. utahensis	Utah juniper	Yes	No	Yes
Juniperus osteosperma	Utah juniper	Yes	No	Yes
Juniperus silicicola	coast juniper, coastal redcedar, southern redcedar, southern red-cedar	Yes	Yes	Yes
Juniperus utahensis	Utah juniper	Yes	No	Yes
Juniperus utahensis var. megalocarpa	Utah juniper	Yes	No	Yes
Juniperus virginiana	eastern redcedar	Yes	Yes	Yes
Juniperus virginiana ssp. crebra	eastern redcedar	Yes	Yes	Yes
Juniperus virginiana ssp. silicicola	coast juniper, coastal redcedar, southern redcedar, southern red-cedar	Yes	Yes	Yes
Juniperus virginiana var. crebra	eastern redcedar	Yes	Yes	Yes
Juniperus virginiana var. silicicola	coast juniper, coastal redcedar, southern redcedar, southern red-cedar	Yes	Yes	Yes
Juniperus virginiana var. virginiana	eastern redcedar	Yes	Yes	Yes
Laurus albida	sassafras	Yes	Yes	No
Laurus albidus	sassafras	Yes	Yes	No
Laurus sassafras	sassafras	Yes	Yes	No
Liquidambar styraciflua	sweetgum	Yes	Yes	Yes
Liriodendron tulipifera	yellow-poplar	Yes	Yes	No
Maclura pomifera	Osage-orange	Yes	No	Yes
Magnolia virginiana	sweetbay	Yes	Yes	No
Magnolia virginiana var. australis	laurier doux, swamp-bay, sweetbay	Yes	Yes	No
Magnolia virginiana var. parva	laurier doux, swamp-bay, sweetbay	Yes	Yes	No
Negundo aceroides	ash-leaf maple, boxelder	Yes	Yes	Yes
Negundo aceroides ssp. interius	ash-leaf maple, boxelder, boxelder maple	Yes	Yes	Yes
Negundo aceroides ssp. violaceum	boxelder	Yes	Yes	Yes
Negundo californica	box elder, California boxelder	Yes	Yes	Yes
Negundo californicum	box elder, California boxelder	Yes	Yes	Yes
Negundo interius	ash-leaf maple, boxelder, boxelder maple	Yes	Yes	Yes
Negundo mexicanum	boxelder	Yes	Yes	Yes
Negundo negundo	ash-leaf maple, boxelder	Yes	Yes	Yes
Nyssa aquatica	water tupelo	Yes	No	Yes
Nyssa biflora	swamp tupelo	Yes	Yes	No
Nyssa biflora var. biflora	swamp tupelo	Yes	Yes	No
Nyssa biflora var. ursina	bear tupelo	Yes	Yes	No
Nyssa sylvatica var. biflora	swamp tupelo	Yes	Yes	No
Nyssa sylvatica var. ursina	bear tupelo	Yes	Yes	No
Nyssa uniflora	water tupelo	Yes	No	Yes
Nyssa ursina	bear tupelo	Yes	Yes	No
Ostrya virginiana	eastern hophornbeam	Yes	Yes	No
Ostrya virginiana var. lasia	eastern hophornbeam, hophornbeam	Yes	Yes	No
Ostrya virginiana var. virginiana	hophornbeam, Virginia hophornbeam	Yes	Yes	No
Oxydendrum arboreum	sourwood	Yes	Yes	No
Picea albertiana	white spruce	Yes	No	Yes
Picea amabilis	Pacific silver fir	Yes	No	Yes
Picea australis	red spruce	Yes	Yes	No
Picea canadensis	white spruce	Yes	No	Yes
Picea canadensis var. glauca	white spruce	Yes	No	Yes
Picea engelmannii	Engelmann spruce	Yes	Yes	No
Picea engelmannii ssp. mexicana	Mexican spruce	Yes	Yes	No
Picea engelmannii var. engelmannii	Engelmann spruce	Yes	Yes	No
Picea engelmannii var. glabra	Engelmann spruce	Yes	Yes	No
Picea engelmannii var. mexicana	Mexican spruce	Yes	Yes	No
Picea glauca	white spruce	Yes	No	Yes
Picea glauca ssp. engelmannii	Engelmann spruce	Yes	No	Yes
Picea glauca var. albertiana	Black Hills spruce, Canadian spruce, cat spruce, skunk spruce, western white spruce, white spruce	Yes	No	Yes
Picea glauca var. densata	Black Hills spruce, Canadian spruce, cat spruce, skunk spruce, western white spruce, white spruce	Yes	No	Yes
Picea glauca var. engelmannii	Engelmann spruce	Yes	No	Yes
Picea glauca var. porsildii	Porsild's spruce	Yes	No	Yes
Picea mariana	black spruce	Yes	Yes	No
Picea mariana var. mariana	black spruce	Yes	Yes	No
Picea mariana var. rubra	red spruce	Yes	Yes	No
Picea mariana var. semiprostrata	black spruce	Yes	Yes	No
Picea nigra	black spruce	Yes	Yes	No
Picea rubens	red spruce	Yes	Yes	No
Picea rubra	red spruce	Yes	Yes	No
Pinus amabilis	Pacific silver fir	Yes	No	Yes
Pinus australis	longleaf pine	Yes	Yes	No
Pinus balsamea	balsam fir	Yes	Yes	Yes
Pinus banksiana	jack pine	Yes	No	Yes
Pinus beardsleyi	ponderosa pine	Yes	Yes	Yes
Pinus benthamiana	ponderosa pine	Yes	Yes	Yes
Pinus brachyptera	ponderosa pine	Yes	Yes	Yes
Pinus caribaea	Honduras pine	Yes	Yes	Yes
Pinus cembroides var. edulis	common or two-needle pinyon	Yes	Yes	No
Pinus chiapensis	eastern white pine	Yes	Yes	Yes
Pinus contorta	lodgepole pine	Yes	Yes	No
Pinus contorta ssp. bolanderi	Bolander's beach pine	Yes	Yes	No
Pinus contorta ssp. contorta	beach pine, coast pine, lodgepole pine, shore pine	Yes	Yes	No
Pinus contorta ssp. latifolia	black pine, Rocky Mountain lodgepole pine	Yes	Yes	No
Pinus contorta ssp. murrayana	Sierra lodgepole pine, tamarack pine	Yes	Yes	No
Pinus contorta var. bolanderi	Bolander beach pine	Yes	Yes	No
Pinus contorta var. contorta	beach pine, coast pine, lodgepole pine, shore pine	Yes	Yes	No
Pinus contorta var. latifolia	lodgepole pine, Rocky Mountain lodgepole pine, tall lodgepole pine	Yes	Yes	No
Pinus contorta var. murrayana	Murray's lodgepole pine, Sierra lodgepole pine, tamarack pine	Yes	Yes	No
Pinus densa	Florida slash pine, South Florida slash pine	Yes	Yes	Yes
Pinus densa var. austrokeysensis	Florida slash pine, South Florida slash pine	Yes	Yes	Yes
Pinus divaricata	jack pine	Yes	No	Yes
Pinus divaricata var. hendersonii	lodgepole pine, Rocky Mountain lodgepole pine, tall lodgepole pine	Yes	Yes	No
Pinus divaricata var. latifolia	lodgepole pine, Rocky Mountain lodgepole pine, tall lodgepole pine	Yes	Yes	No
Pinus divaricata var. musci	jack pine	Yes	No	Yes
Pinus douglasii	coast Douglas-fir, Douglas-fir	Yes	No	Yes
Pinus douglassii	coast Douglas-fir, Douglas-fir	Yes	No	Yes
Pinus echinata	shortleaf pine	Yes	Yes	Yes
Pinus edulis	common or two-needle pinyon	Yes	Yes	No
Pinus edulis var. edulis	twoneedle pinyon	Yes	Yes	No
Pinus elliottii	slash pine	Yes	Yes	Yes
Pinus elliottii var. austrokeyensis	Florida slash pine, South Florida slash pine	Yes	Yes	Yes
Pinus elliottii var. austrokeysensis	Key pine	Yes	Yes	Yes
Pinus elliottii var. densa	Florida slash pine, South Florida slash pine	Yes	Yes	Yes
Pinus elliottii var. elliottii	Honduras pine	Yes	Yes	Yes
Pinus glauca	white spruce	Yes	No	Yes
Pinus grandis	grand fir	Yes	No	Yes
Pinus heterophylla	Florida slash pine, South Florida slash pine	Yes	Yes	Yes
Pinus murrayana	Murray's lodgepole pine, Sierra lodgepole pine, tamarack pine	Yes	Yes	No
Pinus palustris	longleaf pine	Yes	Yes	No
Pinus ponderosa	ponderosa pine	Yes	Yes	Yes
Pinus ponderosa ssp. scopulorum	Black Hills pondersosa pine, Rocky Mountain ponderosa pine	Yes	Yes	Yes
Pinus ponderosa ssp. washoensis	ponderosa pine	Yes	Yes	Yes
Pinus ponderosa var. benthamiana	ponderosa pine	Yes	Yes	Yes
Pinus ponderosa var. brachyptera	ponderosa pine	Yes	Yes	Yes
Pinus ponderosa var. ponderosa	ponderosa pine	Yes	Yes	Yes
Pinus ponderosa var. scopulorum	Black Hills ponderosa pine, interior pondersosa pine, ponderosa pine, Rocky Mountain ponderosa pine	Yes	Yes	Yes
Pinus ponderosa var. washoensis	Washoe pine	Yes	Yes	Yes
Pinus resinosa	red pine	Yes	Yes	Yes
Pinus rigida	pitch pine	Yes	Yes	No
Pinus scopulorum	Black Hills ponderosa pine, interior pondersosa pine, ponderosa pine, Rocky Mountain ponderosa pine	Yes	Yes	Yes
Pinus strobus	eastern white pine	Yes	Yes	Yes
Pinus strobus var. chiapensis	eastern white pine, northern white pine, soft pine, Weymouth pine, white pine	Yes	Yes	Yes
Pinus taeda	loblolly pine	Yes	Yes	Yes
Pinus virginiana	Virginia pine	Yes	Yes	No
Pinus washoensis	ponderosa pine	Yes	Yes	Yes
Pinus X musciicata var. X	jack pine	Yes	No	Yes
Populus aurea	quaking aspen	Yes	Yes	No
Populus balsamifera	balsam poplar	Yes	Yes	No
Populus balsamifera ssp. balsamifera	balsam poplar	Yes	Yes	No
Populus balsamifera var. candicans	balsam poplar	Yes	Yes	No
Populus balsamifera var. fernaldiana	balsam poplar	Yes	Yes	No
Populus balsamifera var. lanceolata	balsam poplar	Yes	Yes	No
Populus balsamifera var. michauxii	balsam poplar	Yes	Yes	No
Populus balsamifera var. subcordata	balsam poplar	Yes	Yes	No
Populus candicans	balsam poplar	Yes	Yes	No
Populus cercidiphylla	quaking aspen	Yes	Yes	No
Populus grandidentata	bigtooth aspen	Yes	Yes	Yes
Populus grandidentata var. angustata	bigtooth aspen	Yes	Yes	Yes
Populus grandidentata var. meridionalis	bigtooth aspen	Yes	Yes	Yes
Populus grandidentata var. subcordata	bigtooth aspen	Yes	Yes	Yes
Populus michauxii	balsam poplar	Yes	Yes	No
Populus tacamahaca	balsam poplar	Yes	Yes	No
Populus tacamahaca var. candicans	balsam poplar	Yes	Yes	No
Populus tacamahaca var. lanceolata	balsam poplar	Yes	Yes	No
Populus tacamahaca var. michauxii	balsam poplar	Yes	Yes	No
Populus tacanahaca var. candicans	balsam poplar	Yes	Yes	No
Populus tacanahaca var. lanceolata	balsam poplar	Yes	Yes	No
Populus tacanahaca var. michauxii	balsam poplar	Yes	Yes	No
Populus tremula ssp. tremuloides	quaking aspen	Yes	Yes	No
Populus tremuloides	quaking aspen	Yes	Yes	No
Populus tremuloides var. aurea	quaking aspen	Yes	Yes	No
Populus tremuloides var. cercidiphylla	quaking aspen	Yes	Yes	No
Populus tremuloides var. intermedia	quaking aspen	Yes	Yes	No
Populus tremuloides var. magnifica	quaking aspen	Yes	Yes	No
Populus tremuloides var. rhomboidea	quaking aspen	Yes	Yes	No
Populus tremuloides var. vancouveriana	quaking aspen	Yes	Yes	No
Populus vancouveriana	quaking aspen	Yes	Yes	No
Populus X polygonifolia	quaking aspen	Yes	Yes	No
Pseudotsuga douglasii	coast Douglas-fir, Douglas-fir	Yes	No	Yes
Pseudotsuga douglassii	coast Douglas-fir, Douglas-fir	Yes	No	Yes
Pseudotsuga flahaultii	blue Douglas-fir, Colorado Douglas-fir, Douglas-fir, inland Douglas-fir, Rocky Mountain Douglas-fir	Yes	No	Yes
Pseudotsuga menziesii	Douglas-fir	Yes	No	Yes
Pseudotsuga menziesii var. flahaultii	blue Douglas-fir, Colorado Douglas-fir, Douglas-fir, inland Douglas-fir, Rocky Mountain Douglas-fir	Yes	No	Yes
Pseudotsuga menziesii var. glauca	blue Douglas-fir, Colorado Douglas-fir, Douglas-fir, inland Douglas-fir, Rocky Mountain Douglas-fir	Yes	No	Yes
Pseudotsuga menziesii var. menziesii	coast Douglas-fir, Douglas-fir	Yes	No	Yes
Pseudotsuga menziesii var. viridis	coast Douglas-fir, Douglas-fir	Yes	No	Yes
Pseudotsuga mucronata	coast Douglas-fir, Douglas-fir	Yes	No	Yes
Pseudotsuga taxifolia	coast Douglas-fir, Douglas-fir	Yes	No	Yes
Pseudotsuga taxifolia var. glauca	blue Douglas-fir, Colorado Douglas-fir, Douglas-fir, inland Douglas-fir, Rocky Mountain Douglas-fir	Yes	No	Yes
Quercus alba	white oak	Yes	Yes	No
Quercus alba var. subcaerulea	white oak	Yes	Yes	No
Quercus alba var. subflavea	white oak	Yes	Yes	No
Quercus chrysolepis	canyon live oak	Yes	Yes	Yes
Quercus chrysolepis var. chrysolepis	canyon live oak	Yes	Yes	Yes
Quercus chrysolepis var. nana	canyon live oak	Yes	Yes	Yes
Quercus coccinea	scarlet oak	Yes	Yes	No
Quercus coccinea var. coccinea	scarlet oak	Yes	Yes	No
Quercus coccinea var. tuberculata	scarlet oak	Yes	Yes	No
Quercus ellipsoidalis	northern pin oak	Yes	No	Yes
Quercus hemisphaerica	laurel oak	Yes	Yes	No
Quercus houstoniana	chestnut oak	Yes	Yes	No
Quercus laurifolia	laurel oak	Yes	Yes	No
Quercus michauxii	chestnut oak	Yes	Yes	No
Quercus microcarya	water oak	Yes	Yes	Yes
Quercus montana	chestnut oak	Yes	Yes	No
Quercus nigra	water oak	Yes	Yes	Yes
Quercus nigra var. heterophylla	water oak	Yes	Yes	Yes
Quercus obtusa	laurel oak	Yes	Yes	No
Quercus phellos var. laurifolia	laurel oak	Yes	Yes	No
Quercus prinus	chestnut oak	Yes	Yes	No
Quercus succulenta	laurel oak	Yes	Yes	No
Quercus velutina	black oak	Yes	Yes	No
Quercus velutina var. missouriensis	black oak	Yes	Yes	No
Quercus wilcoxii	canyon live oak	Yes	Yes	Yes
Quercus X richteri	scarlet oak	Yes	Yes	No
Robinia pseudoacacia	black locust	Yes	Yes	Yes
Robinia pseudo-acacia	black locust	Yes	Yes	Yes
Robinia pseudoacacia f. inermis	black locust, false acacia, yellow locust	Yes	Yes	Yes
Robinia pseudoacacia var. pyramidalis	black locust	Yes	Yes	Yes
Robinia pseudoacacia var. rectissima	black locust, false acacia, yellow locust	Yes	Yes	Yes
Rufacer carolinianum	red maple	Yes	Yes	Yes
Rufacer drummondii	Drummond's maple	Yes	Yes	Yes
Rufacer rubrum	red maple	Yes	Yes	Yes
Rulac negundo	ash-leaf maple, boxelder	Yes	Yes	Yes
Rulac texana	ashleaf maple, boxelder	Yes	Yes	Yes
Sabina monosperma	oneseed juniper	Yes	No	Yes
Sabina osteosperma	Utah juniper	Yes	No	Yes
Sabina silicicola	coast juniper, coastal redcedar, southern redcedar, southern red-cedar	Yes	Yes	Yes
Sabina utahensis	Utah juniper	Yes	No	Yes
Sabina virginiana	eastern redcedar	Yes	Yes	Yes
Saccharodendron barbatum	sugar maple	Yes	Yes	No
Saccharodendron saccharum	sugar maple	Yes	Yes	No
Salix ambigua	black willow	Yes	No	Yes
Salix denudata	black willow	Yes	No	Yes
Salix dubia	black willow	Yes	No	Yes
Salix falcata	black willow	Yes	No	Yes
Salix flavovirens	black willow	Yes	No	Yes
Salix ligustrina	black willow	Yes	No	Yes
Salix ludoviciana	black willow	Yes	No	Yes
Salix nigra	black willow	Yes	No	Yes
Salix nigra var. altissima	black willow	Yes	No	Yes
Salix nigra var. brevifolia	black willow	Yes	No	Yes
Salix nigra var. brevijulis	black willow	Yes	No	Yes
Salix nigra var. falcata	black willow	Yes	No	Yes
Salix nigra var. lindheimeri	black willow	Yes	No	Yes
Salix nigra var. longifolia	black willow	Yes	No	Yes
Salix nigra var. marginata	black willow	Yes	No	Yes
Salix purshiana	black willow	Yes	No	Yes
Sassafras albidum	sassafras	Yes	Yes	No
Sassafras albidum var. molle	sassafras	Yes	Yes	No
Sassafras officinale	sassafras	Yes	Yes	No
Sassafras sassafras	sassafras	Yes	Yes	No
Sassafras variifolium	sassafras	Yes	Yes	No
Strobus strobus	eastern white pine	Yes	Yes	Yes
Taxodium ascendens	pond cypress, pondcypress	Yes	Yes	Yes
Taxodium distichum	baldcypress	Yes	Yes	Yes
Taxodium distichum var. distichum	baldcypress	Yes	Yes	Yes
Taxodium distichum var. imbricarium	pond cypress	Yes	Yes	Yes
Taxodium distichum var. nutans	baldcypress	Yes	Yes	Yes
Thuja occidentalis	northern white-cedar	Yes	Yes	Yes
Thuja occidentalis f. malonyana	arborvitae, eastern white cedar, northern white cedar, swamp cedar	Yes	Yes	Yes
Thuja occidentalis var. fastigiata	arborvitae, eastern white cedar, northern white cedar, swamp cedar	Yes	Yes	Yes
Thuja occidentalis var. nigra	arborvitae, eastern white cedar, northern white cedar, swamp cedar	Yes	Yes	Yes
Thuja occidentalis var. pyramidalis	arborvitae, eastern white cedar, northern white cedar, swamp cedar	Yes	Yes	Yes
Thuja occidentslis	northern white-cedar	Yes	Yes	Yes
Tilia americana	American basswood	Yes	Yes	Yes
Tilia americana var. americana	American basswood	Yes	Yes	Yes
Tilia americana var. caroliniana	Carolina basswood	Yes	Yes	Yes
Tilia americana var. heterophylla	American basswood	Yes	Yes	Yes
Tilia americana var. neglecta	American basswood	Yes	Yes	Yes
Tilia australis	Carolina basswood	Yes	Yes	Yes
Tilia caroliniana	Carolina basswood	Yes	Yes	Yes
Tilia caroliniana var. rhoophila	Carolina basswood	Yes	Yes	Yes
Tilia eburnea	American basswood	Yes	Yes	Yes
Tilia floridana	Carolina basswood	Yes	Yes	Yes
Tilia floridana var. hypoleuca	Carolina basswood	Yes	Yes	Yes
Tilia floridana var. oblongifolia	Carolina basswood	Yes	Yes	Yes
Tilia georgiana	Carolina basswood	Yes	Yes	Yes
Tilia glabra	American basswood	Yes	Yes	Yes
Tilia heterophylla	American basswood	Yes	Yes	Yes
Tilia heterophylla var. michauxii	American basswood	Yes	Yes	Yes
Tilia lasioclada	American basswood	Yes	Yes	Yes
Tilia leptophylla	Carolina basswood	Yes	Yes	Yes
Tilia leucocarpa	Carolina basswood	Yes	Yes	Yes
Tilia leucocarpa var. brevipedunculata	Carolina basswood	Yes	Yes	Yes
Tilia littoralis	Carolina basswood	Yes	Yes	Yes
Tilia michauxii	American basswood	Yes	Yes	Yes
Tilia monticola	American basswood	Yes	Yes	Yes
Tilia neglecta	American basswood	Yes	Yes	Yes
Tilia palmeri	American basswood	Yes	Yes	Yes
Tilia porracea	Carolina basswood	Yes	Yes	Yes
Tilia pubescens	Carolina basswood	Yes	Yes	Yes
Tilia truncata	American basswood	Yes	Yes	Yes
Tilia venulosa	American basswood	Yes	Yes	Yes
Toxylon pomiferum	Osage-orange	Yes	No	Yes
Tsuga douglasii var. glauca	blue Douglas-fir, Colorado Douglas-fir, Douglas-fir, inland Douglas-fir, Rocky Mountain Douglas-fir	Yes	No	Yes
Ulmus americana	American elm	Yes	Yes	Yes
Ulmus americana var. floridana	American elm	Yes	Yes	Yes
Ulmus floridana	American elm	Yes	Yes	Yes
Ulmus fulva	slippery elm	Yes	Yes	Yes
Ulmus rubra	slippery elm	Yes	Yes	Yes
Wallia nigra	black walnut	Yes	No	Yes
Report Species Count: 420

NPSpecies - The National Park Service biodiversity database. IRMA Portal version. https://irma.nps.gov/npspecies. Accessed 4/10/2026 5:36:08 AM

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