ANALYTICAL KEY 7 



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

 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 AMYGDALOIDES (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, QUERCUS IMBRICARIA. 



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, QUERCUS ALBA (p. 50). 

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

 bark gray. POST OAK, QTJERCUS STELLATA (p. 50). 

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

 awned, making a fringe. 



BUR OAK, QUERCTTS MACROCARPA (p. 50). 

 k. Leaves slightly lobed or merely toothed. 

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



SWAMP WHITE OAK, QUERCUS BICOLOR (p. 50). 



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



OAKS, QTJERCUS MUHLENBERGII and Q. PRINUS (p. 50, 51). 



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 23 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 PALUSTRIS (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 CAROLINIAN A (p. 48). 

 i. Bark rough below, smooth and brown above. 



HOP HORNBEAM, OSTRYA VIRGINIANA (p. 47). 

 g. Leaves compound (.Walnut family). 



h. 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 CINEREA (p. 46). 



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

 i> Bark shaggy; husk thick; seed sweet. 



SHAG-BARK HICKORY, CARYA OVATA (p. 46). 

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



