Campus Tree Key

A KEY TO THE COMMON TREES OF BETHEL COLLEGEby R.A. Kistler1.Tree bearing needles or scales .........21.Trees with broad leaves, > 5mm wide....72.Leaves linear, needle-like.............32.Leaves scale-like..(White Cedar, Arborvitae)Thuja occidentalistwisted...................(Jack Pine)Pinus banksiana6.Leaves straight 3-8 cm, bluish-green........................(Scotch Pine)Pinus sylvestris3.Leaves solitary........................43.Leaves in groups of 2 to 5.............54.Leaves 4-sided in cross section, bluegreen,cones 6-10cm long ...(ColoradoBlue Spruce) Picea pungens7.Leaves compound ........................87.Leaves simple.........................144.Leaves 4-sided in cross section, green,cones 3-5cm long......(White Spruce)Picea glauca5.Leaves in bundles of 5 ....(White Pine)Pinus strobus8.Leaves opposite........................98.Leaves alternate......................109.Petiole bases meeting around twigs,leaflets 3-5, often lobed.(Box elder)Acer negundo5.Leaves in bundles of 2 (or 3)..........66.Leaves > 8cm in length and brittle, barkreddish.................(Norway Pine)Pinus resinosa9. Petiole bases widely separated,leaflets > 5 .............(green ash)Fraxinus pennsylvanica6. Leaves only 2-5 cm, divergent,110. A small shrub, pinnate leaves 14-24inches in length, 11-31 leaflets....11

10. Not as above, larger more tree-like....................................1211. Densely hairly, velvety twigs....................(Staghorn sumac)Rhus typhina14. Simple leaves with toothed or entiremargines, not lobed.................2015. Leaves opposite, with well definedlobes...............................1615. Leaves alternate....................1716. Leaves deeply 5-lobed, the sides ofthe terminal lobe slope inward, leavesbright green above and silvery whitebeneath............... (silver maple)Acer saccharinum11. Twigs smooth...........(Smooth Sumac)Rhus glabra12. Leaves pinnately compound, 8-14 inchesin length, with 7-19 oval leafletsusually 1-2 inches in length, pea likepods.................(Common locust)Robinia pseudoacacia16. Leaves somewhat less deeply lobed,with V-shaped sinuses, the sides ofthe terminal lobe are parallel orslope outward, leaves smooth, upperdark green, lower whitened.....(Redmaple)Acer rubrum12. Leaflets lanceshaped................1313. Leaves pinnately compound, 7-10 incheslong, with ≥ 18 leaves, ˜1 inch inlength, with very long pea like pods.......................(Honey Locust)Gleditsia triacanthos16. Leaves more shallowly 5-lobed,sparingly, irregularly toothed.........................(Sugar Maple)Acer saccharum13. Leaves 15-30 inches in length, hairypetiole, 11-17 sessile leaflets..........................(Butternut)Juglans cinerea13. Leaves 6-10 inches in length, smoothpetiole, 7-11 leaflets,terminal but a bright orangeyellow.......(Butternut Hickory)Carya cordiformis14. Simple leaves with well defined lobes....................................15217. Leaf lobes acute and bristle-tipped................................... 1917. Leaf lobes rounded and lackingbristles.............................1818. Leaves mostly bi-lobed, fan shaped(near seminary)................(Ginko)Ginko biloba

Salix pendulina18. Leaves larger with many rounded lobes..........................(White oak)Quercus alba22. Twigs not noticeably drooping, leaveslinear 3 times longer than wide,skinny...............................2221. Leaves more ovate, not asabove......2322. Twigs with notable drooping habit,leaves broadly lanceolate.........(Wisconsin Weeping Willow)326. Leaves coarsely toothed, uneven at thebase................................2726. Leaves with finely toothed margins..29

27. Leaves with 3 prominent veins arisingfrom the summit of the short petiole..........................(Hackberry)Celtis occidentalis29. Leaves alternate to opposite, broadlyovate with curved tips and about 3main curving veins; fruit a blueishblackberry.......................(Buckthorn)Rhamnus cathartica27. Leaves with other veinarrangements..2828. Leaves Heartshaped, 6-16cm long by 5-13cm wide, with sharp coarse marginalteeth; pealike fruits hanging below aleafy bract................(Basswood)Tilia americana29. Leaves ovate, entire to toothed, fruitsmall apple-like pome ...(Crab apple)Pyrus ionensis28. Leaves smooth to softly hair on uppersurface............ ..(American Elm)Ulmus americana29. Leaves ovate to elliptical, 2-4 timeslonger than wide, lustrous green abovepaler beneath, with a prominent hairymidvein and obscure lateral veins.................(Wild Black Cherry)Prunus serotina28. Twigs hairy, leaves roughly hairyabove and along veins below.(Red Elm)Ulmus rubra4