Science Olympiad tree list for Michigan
and Envirothon Forestry
Picea abies Evergreen needles, stiff, 1/2 to 1 inch long, 4-angled but somewhat flattened, with a sharp pointed tip, shiny deep green. Each needle borne on a raised, woody peg (sterigma).
Picea glauca Evergreen needles, stiff, 1/3 to 3/4 inch long, square in cross section, needle tips are pointed but not sharp, green to gray-green. Each needle borne on a raised, woody peg (sterigma).
Picea mariana Evergreen, four-sided needles, stiff, 1/4 to 1/2 inch long, light blue-green in color, somewhat blunt pointed tips, light blue-green to gray.
Evergreen needles, 3/4 to 1 1/4 inches long, stiff and very sharp (spine-like), displayed nearly straight out from twig, silvery blue to dark green. Strong acidic taste. Each needle borne on a raised, woody peg (sterigma).
Evergreen needles, 3/4 to 1 1/2 inches long, two twisted, divergent needles per fascicle, fascicle sheath is present but short; yellow-green in color.
Evergreen needles, 4 to 6 inches long, with two needles per fascicle that snap cleanly when bent, dark green.
Eastern White Pine
Evergreen needles, 3 to 5 inches long, with five, slender, flexible needles per fascicle
Scotch Pine (Scots Pine)
Evergreen needles, 1 1/2 to 3 inches long, with two stout, twisted needles per fascicle, blue-green with distinct stomatal bands.
Platanus occidentalis Alternate, simple, palmately veined, 4 to 8 inches wide, ovate in shape, with three to five lobes, margins coarsely toothed
Populus balsamifera Alternate, simple, ovate, finely serrated, 3 to 6 inches long, shiny dark green, paler and often blotchy orange below, petiole long
Populus deltoides Alternate, simple, pinnately veined, 3 to 6 inches long, triangular (deltoid) in shape with a crenate/serrate margin
Bigtooth (Largetooth) Aspen
Populus grandidentata Alternate, simple, orbicular to ovate, 3 to 4 inches long, pinnately veined, large blunt teeth, petiole flattened vertically
Populus tremuloides Alternate, simple, 1 to 3 inches long, green above and paler below, heart-shaped to nearly round with a fine toothed margin
Pin Cherry (fire cherry)
Prunus pennsylvanica Alternate, simple, lanceolate, 3 to 5 inches long, 1 to 1 1/2 inches wide, finely serrated margin
Prunus serotina Alternate, simple, 2 to 5 inches long, oblong to lance-shaped, finely serrated, very small inconspicuous glands on petiole, dark green and lustrous above
Prunus virginiana Alternate, simple, oblong to nearly oval, 2 to 4 inches long, finely serrated margin
Quercus alba Alternate, simple, oblong to ovate in shape, 4 to 7 inches long; 7 to 10 rounded, finger-like lobes, sinus depth varies from deep to shallow, apex is rounded and the base is wedge-shaped, green to blue-green above and whitish below.
Swamp White Oak
Quercus bicolor Alternate, simple, obovate, 3 to 7 inches long, margin with large irregular blunt teeth, 2 to 4 1/2 inches wide
Quercus coccinea Alternate, simple, 3 to 7 inches long, oval in shape with very deep sinuses and bristle-tipped lobes
Northern Pin Oak
Quercus macrocarpa Alternate, simple, 6 to 12 inches long, roughly obovate in shape, with many lobes. The two middle sinuses nearly reach the midrib dividing leaf nearly in half. The lobes near the tip resemble a crown
Quercus muhlenbergii Alternate, simple, obovate or oblong, large coarse gland tipped teeth on margin, 4 to 7 inches long
Quercus palustris Alternate, simple, 3 to 6 inches long, oval in outline with 5 to 9 bristle-tipped lobes and irregularly deep sinuses that extend nearly to the midrib. Major lobes form a U-shape.
Northern Red Oak
Quercus rubra Alternate, simple, 5 to 8 inches long, oblong in shape with 7 to 11 bristle-tipped lobes, sinuses extend 1/3 to 1/2 of the way to midvein, generally very uniform in shape
Quercus shumardii Alternate, simple, 4 to 7 inches long, 5 to 9 lobes with coarse bristle tips, sinuses extend more than halfway to midrib
Quercus velutina Alternate, simple, 4 to 10 inches long, obovate or ovate in shape with 5 (mostly) to 7 bristle-tipped lobes; leaf shape is variable, with some leaves having deep sinuses and shade leaves having very shallow sinuses, lustrous shiny green above
Rhus typhina Alternate, pinnately compound, 16 to 24 inches long, with 11 to 31 lanceolate leaflets with serrate margins each 2 to 5 inches long, rachis fuzzy
Robinia pseudoacacia Alternate, pinnately compound, with 7 to 19 leaflets, 8 to 14 inches long. Leaflets are oval, one inch long, with entire margins. Leaves resemble sprigs of grapes
Salix babylonica Alternate, simple, very narrowly lance-shaped, finely serrated margin, yellow-green above, milky green below, 3 to 6 inches in length, 3/8 to 1/2 inch in width.
Salix nigra Alternate, simple, pinnately veined, lanceolate in shape, 3 to 6 inches long, with a finely serrate margin. Leaves are dark and shiny above, light green below.
Alternate, simple, pinnately veined, ovate to elliptical, entire, 3 to 6 inches long with 1 to 3 lobes; the 2-lobed leaf resembles a mitten, the 3-lobed leaf resembles a trident
Sorbus americana Alternate, pinnately compound, 6 to 10 inches long, 11 to 17 lance-shaped, serrated leaflets, 2 to 2 1/2 inches long, often arching,
Evergreen, scale-like, on main shoots, 1/4 inch long with long points. Lateral shoots are flattened, 1/8 inch long with short points.
Tilia americana Alternate, simple, ovate to cordate, 5 to 6 inches long, with serrate margins, pinnately veined, base is unequally cordite
Evergreen, flat, single needles, 1/2 inch long, tapering to a dull point, primarily two-ranked, shiny dark green above, 2 lines of white stomata below
Ulmus americana Alternate, simple, ovate to oblong, 3 to 5 inches long, 1 to 3 inches wide, margin coarsely and sharply doubly serrate, base conspicuously inequilateral
Ulmus pumila Alternate, simple, elliptical to ovate, 1 to 2 1/2 inches long, singly serrated margin, nearly an equilateral base
Ulmus rubra Alternate, simple, ovate to oblong, 4 to 6 inches long, 2 to 3 inches wide, margin coarsely and sharply doubly serrated, base conspicuously inequilateral