National Register of Site Index Curves

Scientific Name Common Name NSPNS	Curve Number Age Base Reference	Area of Use	Age Correction Factor
Abies amabilis Pacific silver fir ABAM	05 100TA Hoyer, Herman 1989	Entire Range	Not Needed
Abies balsamea balsam fir ABBA	010 50TA Gevorkiantz 1956a	Northeast	SI Years	30 15	40 13	50 11	60 9	70 8
	011 50TA Carmean, Hahn 1981	Lake States	SI Years	20 15	30 13	40 11
	020 50TA Lloyd 1970a	Northeast	SI Years	30 15	40 13	50 11	60 9	70 8
Abies concolor white fir ABCO	030 50TA Schumacher 1926	Entire Range	SI Years	30 16	40 14	50 12	60 10	70 8	80 6	90 5
	031 50BH Cochran 1979a	East of Cascades in OR and WA	Not Needed
	032 50BH Dolph 1987	West of Sierra Nevada Range
	035 50BH SCS 1988a	East of Cascades in OR and WA
	605 300TA Dunning 1942	California	SI Years	71-84 12	85-98 10	99-112 8	113+ 6
Abies fraseri Fraser fir ABFR	020 50TA Lloyd 1970a	Entire Range	SI Years	30 15	40 13	50 11	60 9	70 8
Abies grandis grand fir ABGR	031 50BH Cochran 1979a	East of Cascades in OR and WA	Not Needed
Abies grandis grand fir ABGR	570 50TA Haig 1932	Entire Range	SI Years	40 9	50 8	60 7	70 7	80 6	90 6
Abies magnifica California red fir ABMA	050 50TA Schumacher 1928	Entire Range	SI Years	30 16	40 14	50 12	60 10	70 8	80 6
	055 50BH Dolph 1991	WA, OR	Not Needed
	605 300TA Dunning 1942	California	SI Years	71-84 12	85-98 10	99-112 8	113+ 6
Abies pocera noble fir ABPR	060 100BH Herman, Curtis, DeMars 1978	Entire Range	Not Needed
Acer nigrum black maple ACNI5	070 50TA Lloyd 1971a	Entire Range	SI Years	50 5	60 4	70 3
Acer rubrum red maple ACRU	094 50TA Lloyd 1971b	Entire Range	SI Years	50 5	60 4	70 3
Acer rubrum red maple ACRU	095 50TA Carmean 1978	WI, MI	All Sites - 4 years
Acer saccharinum silver maple ACSA2	070 50TA Lloyd 1971a	Entire Range	SI Years	50 5	60 4	70 3
Acer saccharum sugar maple ACSA3	071 50TA Carmean 1978	WI, MI	All Sites - 4 years
Acer saccharum sugar maple ACSA3	075 50TA Brendemuehl, McComb, Thomson 1961	Entire Range	SI Years	50 5	60 4	70 3
Alnus rubra red alder ALRU2	100 50TA Worthington, Johnson, Staebler, Lloyd 1960	Entire Range	All Sites - 2 years
Alnus rubra red alder ALRU2	105 20TA Harrigton, Curtis 1986	Western WA and northwest OR	All Sites - 1 year
Betula alleghaniensis yellow birch BEAL2	120 50TA Lloyd 1971a	Entire Range	SI Years	50 5	60 4	70 3
Betula alleghaniensis yellow birch BEAL2	121 50TA Carmean 1978	WI, MI	All Sites - 4 years
Scientific Name Common Name NSPNS	Curve Number Age Base Reference	Area of Use	Age Correction Factor
Betula lenta sweet birch BELE	120 50TA Lloyd 1971a	Entire range	SI Years	50 5	60 4	70 3
Betula papyrifera paper birch BEPA	130 50TA Cooley 1958, 1962	Midwest	SI Years	50 5	60 4	70 3
	131 50TA Carmean 1978	WI, MI	All Sites - 4 years
	140 50TA Lloyd 1971a	Northeast	SI Years	50 5	60 4	70 3
	141 50BH Gregory, Haack 1965	Alaska	SI Years	50 5	60 4	70 3
Calocedrus decurrens incense cedar CADE27	300 50BH Dolph 1983	West of Sierra Nevada Range	Not Needed
Carya alba mockernut hickory CAAL27	157 50TA Boisen, Newlin 1910	Cumberland Mountains	SI Years	30 12	40 10	50 8	60 7	70 6	80 5	90 4
Carya alba mockernut hickory CAAL27	158 50TA Boisen, Newlin 1910	Mississippi Valley
Carya cordiformis bitternut hickory CACO15	151 50TA Boisen 1910	Entire Range
Carya glabra pignut hickory CAGL8	153 50TA Boisen 1910	Cumberland Mountains	SI Years	30 12	40 10	50 8	60 7	70 6	80 5	90 4
	154 50TA Boisen 1910	Mississippi Valley
	155 50TA Boisen 1910	Northern Ohio
	156 50TA Boisen 1910	Ohio Valley
Carya illinoinensis pecan CAIL2	330 50TA Broadfoot, Krinard 1959	Entire Range	SI Years	55 4	65 3	75+ 2
Carya. CARYA	150 50TA Boisen 1910	See codes 151-158	SI Years	30 12	40 10	50 8	60 7	70 6	80 5	90 4
Celtis occidentalis common hackberry CEOC	820 50TA Schnur 1937	Entire Range	SI Years	30 7	40 6	50 5	60 4	70 3	80 2
Scientific Name Common Name NSPNS	Curve Number Age Base Reference	Area of Use	Age Correction Factor
Chamaecyparis thyoides Atlantic white cedar CHTH2	160 50TA Korstian, Brush 1931	Entire Range	SI Years	20 11	30 10	40 9	50 8	60 7	70 6	80 5
Fagus grandifolia American beech FAGR	165 50TA Hampf 1965	Entire Range	SI Years	30 9	40 7	50 6	60 5	61-85 4	86+ 3
Fagus grandifolia American beech FAGR	166 50TA Carmean 1978	WI, MI	All Sites - 4 Years
Fraxinus americana white ash FRAM2	170 50TA Lloyd 1971a	Entire Range	SI Years	50 5	60 4	70 3
Fraxinus americana white ash FRAM2	171 50TA Carmean 1978	WI, MI	All Sites - 4 years
Fraxinus nigra black ash FRNI	330 50TA Broadfoot, Krinard 1959	Entire Range	SI Years	75 5	85 4	95 3
Fraxinus nigra black ash FRNI	331 50Ta Carmean 1978	WI, MI	All Sites - 4 years
Fraxinus pennsylvanica green ash FRPE	330 50TA Broadfoot, Krinard 1959	Entire Range	SI Years	75 5	85 4	95 3
Fraxinus pennsylvanica green ash FRPE	332 50TA Broadfoot 1969	LA, MS, AR, TN	All Sites - 2 years
Gymnocladus diocius Kentucky coffeetree GYDI	820 50TA Schnur 1937	Entire Range	SI Years	40 6	50 5	60 4	70 3	80 2
Juglans nigra black walnut JUNI	190 50TA Kellogg 1939a	Entire Range	SI Years	40 5	55 4	75 3	90+ 2
	191 25TA Losche, Schlesinger	IL (shallow flood plains)	All Sites - 4 years
	192 25TA Losche, Schlesinger 1975	IL (deep flood plains)	All Sites - 4 years
Juniperus occidentalis western juniper JUOS	210 50BH Barrett, Sauerwein 1982	Entire Range	Not Needed
Juniperus osteosperma Utah juniper JUOS	202 N/A Chojnacky 1986	NV	Not Needed
Juniperus JUNIP Includes: Juniperus monosperma oneseed juniper JUMO Juniperus osteosperma Utah juniper JUOS Juniperus scopulorum Rocky mountain juniper JUSC2 Juniperus deppeana alligator juniper JUDE2	200 N/A Howell 1940	Pinyon-juniper in west	Not Needed
Juniperus virginiana eastern redcedar JUVI	220 50TA T.V.A. 1948	Entire Range	SI Years	20 10	30 7	40 5	50 3
Scientific Name Common Name NSPNS	Curve Number Age Base Reference	Area of Use	Age Correction Factor
Larix decidua European larch LADE2	230 50TA Stone 1957	Entire Range (plantations)	SI Years	50 6	60 5	70 4	80 3
Larix kaempferi Japanese larch LAKA2	240 50TA Aird, Stone 1955	Entire Range (plantations)	SI Years	50 6	60 5	70 4	80 3
Larix laricina tamarack LALA	235 50TA Gevorkiantz 1957a	Entire Range	SI Years	20 10	30 8	40 7	50 6	60 5
Larix occidentalis western larch LAOC	260 50TA Cummings 1937	Montana	SI Years	45 9	55 8	65 7
	261 50BH Cochran 1985	East of Cascades in OR and WA	Not Needed
	265 50TA Schmidt, Shearer, Roe 1976	West Except Montana	SI Years	45 9	55 8	65 7
Liquidambar styraciflua sweetgum LIST2	330 50TA Broadfoot, Krinard 1959	South, Midwest, and West of Mountains in Northeast	SI Years	55 4	65 3	75+ 2
Liquidambar styraciflua sweetgum LIST2	340 50TA Trenk 1929	Virginia and east of Mountains in Northeast	SI Years	40-55 5	56-75 4	76+ 3
Liriodendron tulipifera tuliptree LITU	350 50TA Beck 1962	MLRA's 131, 133A, 133B, 134, 135, 136, 137 138, 148, 149A 149B, 152A, 153A, 153B, , 153C, 154, and 155	SI Years	75 5	85 4	95+ 3
	355 50TA Schlaegel, Kulow, Baughman 1969	WV	All Sites - 3 years
	360 50TA Beck 196	Entire Range (other than listed for curve 350)	SI Years	75 5	85 4	95+ 3
Nyssa aquatica water tupelo NYAQ2	390 50TA Applequist 1959	Entire Range	All Sites - 5 years Age taken at 18 inches above butt swell
Nyssa biflora swamp tupelo NYBI	395 50TA Applequest 1959	Entire Range	All Sites - 5 years
Nyssa sylvatica blackgum NYSY	390 50TA Applequist 1959	Entire Range	All Sites - 5 years
Picea abies Norway spruce PIAB	411 50TA Wlde 1965	WI (plantations)	SI Years	40 17	50 15	60 13
Picea englemannii Engelmanns's spruce PIEN	410 50T Brickell 1966	NOTE: Code no longer available for use. Replaced by code 412.	SI Years	30 16	40 14	50 12	60 10	70 8	80 6
Picea englemannii Engelmanns's spruce PIEN	412 100BH Alexander 1967	Entire Rrange	Not Needed
Picea glauca white spruce PIGL	420 50TA Lloyd 1970a	Northeast	SI Years	30 15	40 13	50 11	60 10	70 9
	421 50TA Gervorkiantz 1957b	MN	SI Years	20 15	30 13	40 11	60 9	70 8
	422 50TA Carmean, Hahn 1981	MN	SI Years	20 15	30 13	40 11
	430 50TA Ferber 1971	Midwest	SI Years	30 15	40 13	50 11	60 10	70 9
	440 100BH Farr 1967	Alaska	Not Needed
Scientific Name Common Name NSPNS	Curve Number Age Base Reference	Area of Use	Age Correction Factor
Picea mariana black spruce PIMA	450 50TA Gevorkiantz 1957c	Entire Range	SI Years	20 15	30 13	40 11	50 10	60 9
Picea pungens blue spruce PIPU	410 50TA Brickell 1966	Entire Range	SI Years	30 16	40 14	50 12	60 10	70 8	80 6
Picea rubens red spruce PIRU	470 50TA Lloyd 1970b		SI Years	30 15	40 13	50 11	60 9	70 8
Picea sitchensis Sitka spruce PISI	490 100TA Meyer 1937		SI Years	100 10	120 9	140 8	160 7	180 6	200 5
Picea sitchensis Sitka spruce PISI	491 50BH Farr 1984	Southeast AK	Not Needed
Pinus banksiana jack pine PIBA2	500 50TA Gevorkiantz 1956b	Entire Range	SI Years	30 9	40 8	50 7	60 6	70 5
	501 50TA Wilde, Lyer, Tanser, Trautmann, Watterston 1965	Lake States	SI Years	30 9	40 8	50 7
	502 50TA Wilde 1965	WI	All Sites - 4 years
Pinus cembroides Mexican pinyon PICE	200 N/A Nowell 1940	Pinyon-juniper in West	Not Needed
Pinus clausa sand pine PICL	510 50TA Schumacher, Coile 1960	Entire Range	SI Years	40 6	50 5	60 4	70 3	80 2
Pinus contorta Lodgepole pine PICO	520 100TA Alexander 1966		All Sites - 9 years
Pinus coulteri Coulter's pine PICO3	600 100TA Meyer 1938		SI Years	<55 16	55-70 14	71-84 12	85-98 10	99-112 8	113+ 6
Pinus echinata shortleaf pine PIEC2	530 50TA Coile, Schumacher 1953	Entire Range	SI Years	55 6	65 5	76+ 4
	531 50TA Nash 1963	MO	SI Years	30-55 6	56-75 5	76+ 4
	532 25TA Gilmore, Metcalf 1961	IL (plantations)	SI Years	<25 7	25-40 6	>40 5
Pinus edulis twoneedle pinyon PIED	200 N/A Nowell 1940	Pinyon-juniper in West	Not Needed
Pinus elliottii slash pine PIEL	550 50TA USDA 1929	Entire Range	SI Years	65 4	75 3	85+ 2
Pinus elliottii slash pine PIEL	555 25TA Barnes 1955		SI Years	<40 4	40-60 3	>60 2
Pinus elliottii densa South Florida slash pine PIELD	540 25TA Langdon 1961		All Sites - 5 years
Pinus elliottii densa South Florida slash pine PIELD	541 25TA Langdon 1959		SI Years	<40 4	40-60 3	>60 2
Pinus jeffreyi Jeffrey Pine PIJE	600 100TA Meyer 1961		SI Years	<55 16	55-70 14	71-84 12	85-98 10	99-112 8	113+ 6
Pinus jeffreyi Jeffrey Pine PIJE	605 300TA Dunning 1942	CA	SI Years	71-84 12	85-98 10	99-112 8	113+ 6
Pinus lambertiana sugar pine PILA	605 300TA Dunning 1942	Entire Range	SI Years	71-84 12	85-98 10	99-112 8	113+ 6
Pinus monophylla singleleaf pinyon PIMO	200 N/A Howell 1940	Pinyon-juniper in West	Not Needed
Pinus monophylla singleleaf pinyon PIMO	202 N/A Chojnacky 1986	NV	Not Needed
Pinus monticola western white pine PIMO3	570 50TA Haig 1932	Entire Range	SI Years	40 9	50 8	60 7	70 7	80 6	90 5
Pinus monticola western white pine PIMO3	605 300TA Dunning 1942	CA	SI Years	71-84 12	85-98 10	99-112 8	113+ 6
Pinus palustris longleaf pine PIPA2	580 50TA USDA 1929	Entire Range	SI Years	50-60 8	70-80 7	90 6
Pinus ponderosa ponderosa pine PIPO	600 100TA Meyer 1938	West of Continental Divide and MT, CO, NM	SI Years	<56 16	57-70 14	71-84 12	85-98 10	99-112 8	113+ 6
	601 100BH Minor 1964	Northern AZ	Not Needed
	605 300TA Dunning 1942	California	SI Years	71-84 12	85-98 10	99-112 8	113+ 6
Scientific Name Common Name NSPNS	Curve Number Age Base Reference	Area of Use	Age Correction Factor
Pinus pungens Table Mountain pine PIPU5	620 50TA Nelson, Clutter, Chaiken 1961	Entire Range	SI Years	55 6	65 5	75 4
Pinus quadrifolia Parry pinyon PIQU	200 N/A Nowell 1940	Pinyon-juniper in West	Not Needed
Pinus resinosa red pine PIRE	630 50TA Gevorkiantz 1957d	Entire Range	SI Years	40 10	50 8	60 6	70 5
	631 50TA Wilde 1965	WI	All Sites - 7 years
	632 25BH Gilmore 1967	IL (plantations)	Not needed
Pinus rigida pitch pine PIRI	635 50TA Illick, Aughanbaugh 1930	Entire range	SI Years	30 9	40 9	50 8	60 7	70 6	80 5	90 4
Pinus serotina pond pine PISE	640 50TA Schumacher, Coile 1960	Entire range	SI Years	55 5	56-75 4	76+ 3
Pinus strobus eastern white pine PIST	650 50TA Doolittle 1960	South: IN, IL, IA, OH, WV, MD, DE, VA, KY	SI Years	<65 7	65-80 6	81-95 5	96+ 4
	651 25BH Gilmore 1968	IL (plantations)	Not needed
	660 50TA Lloyd 1970b	PA, NJ, NY, and New England	SI Years	40 9	50 8	60 7	70 6	80+ 5
	670 50TA Gevorkiantz 1957e	MI, MN, WI	SI Years	40 14	50 12	60 10	70 8	80 6
Pinus taeda loblolly pine PITA	690 50TA Coile, Schumacher 1953	Entire Range	SI Years	<55 5	55-75 4	76+ 3
Pinus taeda loblolly pine PITA	691 25TA Gilmore, Metcalf 1961	IL (plantations)	SI Years	<25 4	>35 3
Pinus virginiana Virginia pine PIVI2	620 50TA Nelson, Clutter, Chaiken 1961	Entire Range	SI Years	55 6	65 5	75 4
Pinus virginiana Virginia pine PIVI2	621 50TA Kulow, Sowers, Heesch 1966	WV, MD, PA	SI Years	<45 6	45-75 5	>75 4
Platanus occidentalis American sycamore PLOC	700 35TA Briscoe, Ferrill 1958	Entire Range	All Sites - 1 year
Populus deltoides eastern cottonwood PODE3	710 30TA Broadfoot 1960	Entire Range	SI Years	<76 2	76+ 1
	711 25TA Neebe, Boyce 1959	IL	All Sites -2 years
	712 25TA Brendemuehl 1965	IA	All Sites -2 years
Populus deltoids monilifera plains cottonwood PODEM	740 50TA BCFS 1977	Pacific Northwest	SI Years	<70 2	70+ 1
Populus grandidentata bigtooth aspen POGR4	720 50TA Gevorkiantz 1956c	Northeast and Midwest	All Sites - 4 years
Populus grandidentata bigtooth aspen POGR4	721 25TA Carmean 1978	WI, MI
Populus tremuloides quaking aspen POTR5	720 50TA Gevorkiantz 1956c	Northeast and Midwest
	725 50TA Gregory, Haack 1965	Alaska
	730 50TA Baker 1925	West Except Alaska	SI Years	<44 6	44-55 5	56-77 4	78+ 3
	735 80BH Edminster, Mowrer, Shepperd 1985	CO, Southern WY, and Northeastern UT	Not Needed
Prunus serotina black cherry PRSE2	750 50TA Defler 1937	Entire Range	SI Years	40 6	50-70 5	80 4	90+ 3
	751 50TA Carmean 1978	WI, MI	All Sites - 4 years
	752 50TA Auchmoody, Rexrode 1984	PA	All Sites - 4 years
Psuedotsuga menziesii Douglas-fir PSME	031 50BH Cochran 1979a	East of Cascades in OR and WA	Not Needed
	605 300TA Dunning 1942	CA	SI Years	71-84 12	85-98 10	99-112 8	113+ 6
	780 100BH Curtis, Herman, DeMars 1974	NOTE: Code no longer available for use. Replaced by code 781.	Not needed
	781 100BH DeMars, Herman 1987	Cascade Mountains Elevation 1000+ in WA Elevation 3000+ in OR Cryic Soils	Not needed
	790 100TA McArdle, Meyer, Bruce 1961	West of Cascade Mountains Except for Code 780	SI Years	<95 10	110 9	140 8	170 7	185+ 6
	795 50BH King 1966	West of Cascade Mountains in WA or OR Mesic and Frigid Soils	Not Needed
Psuedotsuga menziesii glauca Rocky Mountain Douglas-fir PSMEG	600 100TA Meyer 1938	NOTE: Code no longer available for use.	SI Years	<56 16	56-70 14	71-84 12
	765 50BH SCS 1988b	East of Cascades in OR and WA	Not Needed
	770 50TA Brickell 1968	East of Cascades and Sierras Except CO, NM, eastern WA	SI Years	30 16	40 14	50 12	60 10	70 8	80 6
	771 50BH Monserud 1985	Northern ID and Northwestern MT	Not Needed
	775 100BH Edminster Jump 1976	CO, NM, AZ	Not Needed
Scientific Name Common Name NSPNS	Curve Number Age Base Reference	Area of Use	Age Correction Factor
Quercus agrifolia California live oak QUAG	811 50BH DeLasaux Pillsbury 1987	CA	Not Needed
Quercus alba white oak QUAL	802 50TA McQuilkin 1974, 1978	MI	All Sites - 2 years
	803 50TA Graney, Bower 1971	AR	All Sites - 3 years
	804 50TA Carmean 1971, 1972	OH, KY, IN, IL, MO	All Sites - 3 years
Quercus coccinea scarlet oak QUCO2	802 50TA McQuilkin 1974, 1978	MI	All Sites - 2 years
Quercus coccinea scarlet oak QUCO2	805 50TA Carmean 1971, 1972	OH, KY, IN, IL, MO	All Sites - 3 years
Quercus douglasii blue oak QUDO	811 50BH DeLasaux, Pillsbury 1987	CA	Not Needed
Quercus kelloggii California black oak QUKE	880 50BH Powers 1972	Entire Range	Not Needed
Quercus pagoda cherrybark oak QUPA5	840 50Ta Broadfoot 1961	Entire Range	SI Years	40 6	50 5	60 4	70 3	80 2
Quercus garyana Oregon white oak QUGA4	812 50TA Sauerwein 1983	OR, WA, CA	Unknown
Quercus prinus chestnut oak QUPR2	806 50TA Carmean 1971, 1972	OH, KY, IN	All Sites - 3 years
Quercus rubra northern red oak QURU	801 50TA Grane, Bower 1971	AR	All Sites - 3 years
Scientific Name Common Name NSPNS	Curve Number Age Base Reference	Area of Use	Age Correction Factor
Quercus L Upland Oaks QUERC Includes: Quercus alba white oak - QUAL Quercus coccinea scarlet oak QUCO Quercus snuata sinuata bastard Oak QUSIS Quercus ellipsoidalis northern pin oak QUEL Quercus falcalta southern red oak QUFA Quercus macrocarpa bur oak QUMA2 Quercus marilandica blackjack oak QUMA3 Quercus muhlenbergii chinkapin oak QUMU Quercus prinus chestnut oak QUPR2 Quercus rubra northern red oak QURU Quercus stellata post oak QUST Quercus velutina black oak QUVE	807 50TA Carmean 1978	WI, MI	All Sites - 2 years
	800 50TA Gevorkiantz, 1957f	MW, MI, WI	SI Years	30 7	40 6	50 5	60 4	70 3	80 2
	810 50TA Olson 1959	East of Mississippi River in South	SI Years	30 7	40 6	50 5	60 4	70 3	80 2
	820 50TA Schnur 1937	Northeast Midwest Except MN, MI, WI: West of Mississippi River in South	SI Years	30 7	40 6	50 5	60 4	70 3	80 2
Quercus L. Bottom Oaks QUERC Includes: Quercus laurifolia laurel oak QULA3 Quercus lyrata overcup oak QULY Quercus michauxii swamp chestnut oak QUMI Quercus nigra water oak QUNI Quercus texana Nuttall oak QUTE Quercus palustris pin oak QUPA2 Quercus phellos willow oak QUPH Quercus shumardii Shumard's oak QUSH Quercus velutina black oak QUVE	860 50Ta Broadfoot 1963	Entire Range	SI Years	40 6	50 5	60 4	70 3	80 2
	801 50TA Grane, Bower 1971	AR	All Sites - 3 years
	802 50TA McQuilkin 1974, 1978	MI
	808 50TA Carmean 1971, 1972	OH, KY, IN, MO
Robinia pseudoacacia black locust ROPS	900 50TA Kellogg 1939b	Entire Range	SI Years	30-45 3	46-65 2	66+ 1
Sequoia sempervirens redwood SESE3	930 100BH Lindquist, Palley 1963	Entire Range	Not needed
Tilia americana American basswood TIAM	800 50TA Gevorkiantz 1957f	Entire Range	SI Years	30 7	40 6	50 5	60 4	70 3	80 2
Tilia americana American basswood TIAM	809 50TA Carmean 1978	WI, MI	All Sites - 4 years
Tsuga canadensis eastern hemlock TSCA	991 50TA Frothingham 1915	NY, MI, Southern Appalachian Mountains	All Sites - 6 years
Tsuga heterophylla western hemlock TSHE	491 50BH Farr 1984	Southeast AK	Not Needed
	990 100TA Barnes 1962	Entire Range	All Sites - 7 years
	995 50BH Wiley 1978	Western WA	Not Needed
Ulmus americana American elm ULAM	820 50TA Schnur 1937	Entire Range	SI Years	40 6	50 5	60 4	70 3
Ulmus rubra slippery elm ULRU	820 50TA Schnur 1937	Entire Range	SI Years	40 6	50 5	60 4	70 3