ANALYTICAL KEY 



j. Leaflets 57; buds short-pointed, brownish; nut with thick and 

 bony shell. PIGNUT HICKORY, CARYA 6LABRA (p. 47). 



j. Leaflets 711; buds long-pointed, yellow; nut with thin-walled shell. 



BITTERNUT HICKORY, CARYA CORDIFORMIS (p. 47). 

 d. Flowers not in catkins. 



6. Flowers small, usually greenish; corolla inconspicuous or wanting. 

 f. Flowers appearing decidedly before the leaves (Elm). 

 g. Buds with rusty pubescence; bark aromatic; flowers nearly sessile; 

 fruit orbicular, not ciliate; leaves rough above. 



SLIPPERY ELM, ULMTJS FULVA (p. 52). 



g. Buds glabrous; inner bark not aromatic; flowers on slender drooping 

 pedicels; fruit ovate, ciliate; leaves smoothish above. 



WHITE ELM, TTLMTJS AMERICANA (p. 52). 

 f. Flowers appearing with or after the leaves. 

 g. Flowers in dense heads, monoecious; leaves palmately lobed. 



SYCAMORE, PLATANUS OCCIDENTALS (p. 76). 

 g. Flowers not in dense heads. 

 h. Leaves compound; trees thorny; fruit a large flat pod. 



HONEY LOCUST, GLEDITSIA TRIACANTHOS (p. 82). 

 h. Leaves simple. 

 i. Young bark green, aromatic; flowers dioecious. 



SASSAFRAS VARIIFOLITTM (p. 68). 

 i. Bark not aromatic. 

 j. Old bark remaining smooth, gray. 



BEECH, FAGUS GRANDIFOLIA (p. 50). 

 j, Old bark rough. 

 k. Bark with corky warts; leaves oblique at base. 



HACKBERRY, CELTIS OCCIDENTALIS (p. 53). 



k. Bark furrowed, often divided into square plates, ("alligator bark") ; 

 leaves acute at base. SOUR GUM, NYSSA SYLVATICA (p. 101). 

 6. Flowers with conspicuous and usually showy corollas. 

 f . Flowers irregular (papilionaceous) ; fruit a pod, leguminosae. 

 g. Leaves simple, heart-shaped; flowers red-purple. 



REDBUD, CERCIS CANADENSIS (p. 82). 

 g. Leaves compound; flowers white; plant spiny. 



BLACK LOCUST, ROBINIA PSETTDACACIA (p. 84). 

 f. Flowers regular. 



g. Petals brown-purple. PAPAW, ASIMINA TRILOBA (p. 66). 



g. Petals greenish-yellow to cream color. 



h. Sepals and petals five; pistil single; ovary five-celled; leaves heart- 

 shaped. BASSWOOD, TILIA AMERICANA (p. 93). 

 h. Sepals three; petals six or more; pistils many, cohering in a c6ne 



(Magnolia family). 



i. Leaves pointed. CUCUMBER TREE, MAGNOLIA ACUMINATA (p. 65). 

 i. Leaves truncated above. 



TULIP TREE, LIRIODENDRON TTTLIPIFERA (p. 65). 



g. Petals pink. WILD CRAB, PYRUS CORONARIA (p. 77). 



g. Petals white (Rosaceae). 



h. Leaves compound. MOUNTAIN ASH, PYRUS AMERICANA (p. 77). 

 h. Leaves simple. 

 i. Ovary one-celled (Prunus). 

 j. Flowers racemose. 

 k. Leaves oblong, shiny, crenate-serrulate, the teeth incurved; lenticels 



