ANALYTICAL KEY 7 



i. Leaves linear to narrowly lanceolate, short petioled (less than j cm.), 

 green on both surfaces; branchlets detaching readily. 



Black Willow, SALIX NIGRA (p. 42). 

 i. Leaves broadly lanceolate, glaucous beneath; petioles 1-3 cm. long; 

 branchlets not detaching readily. 



Peach-leaved Willow, SALIX AMYGDALOISES (p. 42). 

 f. Only the staminate flowers conspicuously in catkins. 

 g. Leaves simple. 

 h. Catkins naked, very slender; fruit an acorn (Oak). 

 i. Leaves entire. Shingle Oak, QTTEBCTTS IDIBBICARIA. 



i. Leaves conspicuously lobed or toothed. 

 j. Leaf lobes not bristle-pointed; acorns maturing the first year. 

 k. Leaves deeply^ lobed. 

 1. Leaves regularly and narrowly lobed, smooth; bark gray, some- 

 what scaly. White Oak, QTJERCTJS ALBA (p. 50). 

 1, Leaves irregularly and broadly lobed, finely pubescent beneath; 

 bark gray. Post Oak, QUERCUS STELLATA (p. 50). 

 1. Leaves irregularly lobed; bark black, furrowed; upper cup scales 

 awned, making a fringe. 



Bur Oak, QUERCUS MACROCABPAl (p. 50). 

 k. Leaves slightly lobed or merely toothed. 

 1* Fruit long-stalked; leaves downy beneath; bark scaly. 



Swamp White Oak, QUERCTTS BICOLOR (p. 50). 



1, Fruit short-stalked; leaves regularly and many toothed. Chestnut 



Oaks, QUERCUS MUHLENBERGII and Q, PRINUS (p. 50, sO- 



j. Leaf lobes bristle-pointed; acorns maturing the second year; bark 



dark, smooth above, furrowed below. 



k* Cup scales loosely imbricated; inner bark yellow to orange. 



Black Oak, QUERCUS VELUTINA (p. 52). 

 k* Cup scales closely appressed. 

 1. Leaves not deeply pinnatifid; acorns 2—3 cm. long, less than a 

 third being covered by the flat saucer-shaped cups. 



Red Oak, QUERCUS RUBRA (p. 51). 

 1, Leaves deeply pinnatifid; acorns less than 2 cm. long; cups 

 saucer-shaped. Pin Oak, QUERCUS FALUSIRIS (p. 51). 



1, Leaves deeply pinnatifid, shiny above; acorns more than half- 

 covered by the top-shaped or hemispherical cups. 



Scarlet Oak, QUERCUS COCCINEA (p. 52). 

 h. Catkins with conspicuous scales, not very slender; fruit not an acorn. 

 i. Bark close, smooth and gray; stems angular. 



Water Beech, CARPINUS CAROLINIANA (p. 48). 

 i. Bark rough below, smooth and brown above. 



Hop Hornbeam, OSTRYA VIRGINIANA (p. 47). 

 g. Leaves compound (.Walnut family), 

 b. Stamens more than ten; petals four; fruit indehiscent (Walnut), 

 i. Bark black, furrowed, rough; fruit spherical. 



Black Walnut, JUGLANS NIGRA (p. 46). 

 i. Bark with light-colored flattened ridges; fruit ellipsoid. 



Butternut, JUGLANS CINEEEA (p. 46). 

 k. Stamens ten or less; petals none; fruit dehiscent (Hickory), 

 i. Bark shaggy; husk thick; seed sweet. 



Shag-bark Hickory, CASYA OVATA (p. 46). 

 i. Bark not exfoliating; husk thin; seed bitter. 



