NWPCA's PDS© Species Classes

North American Hardwoods	North American Softwoods
Class 21- Eastern Oaks Eastern Red and White Oaks Class 1-High Density Eastern Hardwoods Hickory Birch: Yellow, Sweet Maple: Sugar, Black, Red Ash: Green, White Elm: Rock, Slippery American Beech Black Locust Black Cherry Tanoak Dogwood Persimmon Class 2- Bigleaf Maple/Oregon Ash Class 3- Medium Density Eastern Hardwoods Sweetgum Tupelo Paper Birch Ash: Black, Pumpkin Maple: Silver, Striped Magnolia Sycamore Hackberry Class 4- Western Hardwoods Oregon White Oak California Black Oak Cascara Chinquapin Myrtle Madrone Class 6 - Red Alder Class 29- Yellow Poplar Class 7- Low Density Eastern Hardwoods Aspen: Bigtooth, Quaking Catalpa Buckeye Butternut American Basswood Cottonwood: Black, Balsam Poplar, Eastern	Class 22- Southern Yellow Pine Southern Pine: Loblolly, Longleaf, Shortleaf, Slash Class 11- Douglas-Fir Douglas-fir: Coast, Interior West, Interior North, Interior South, Western Larch Class 12- Hem-Fir Hemlock: Western, Mountain Fir: California Red, Grand, Noble, Pacific Silver, White Class 13- SPF Spruce: White, Black, Red, Engelmann, Sitka Pine: Sugar, Western White, Lodgepole, Ponderosa, Monterey, Jack, Norway, Eastern White Southern Pine: Pitch, Pond, Spruce, Virginia Fir: Subalpine, Balsam Baldcypress Eastern Hemlock Western Red Cedar Redwood Class 14- Low Density Softwoods Cedar: Alaska, Incense, Port Orford, Atlantic White, Northern White, Eastern Red
European Species Classes	South American and Other Species Classes
Class 31- Imported Hardwoods Mengkulang Kapur Keruing Class 32 - Dense European Hardwoods Ash: European Beech: European Oak: European Plane: European Class 33- Dense European Softwoods Douglas-fir Larch: European, Japanese Pine: Maritime, Scots, Jack Class 34- Medium Dense Woods Poplar: Grey, Black Italian Elm: Dutch Redwood Fir: Silver Larch: Hybrid Pine: Lodgepole, Corsican Fir: Silver Class 35- Whitewood Elm: English Spruce: Sitka (Canada) Whitewood Class 36- Common European Softwoods Pine: Radiata Spruce: Black, Norway Willow: White Spruce: White, Sitka (U.K., Eire) Class 37- Hybrid Poplar Poplar: Hybrid	Class 41 Radiata Pine (Chile) Class 42 Gmelina arborea (Costa Rica) Class 43 Pinus caribaea (Venezuela) Class 44 Pinus elliottii Class 45 Pinus taeda Class 46 Eucalyptus grandis (Uruguay)

1421 Prince Street, Suite 340, Alexandria, VA 22314-2805 703-519-6104 FAX 703-519-4720