5— Willow Family. Stamens and pistils on separate trees (dioe- 
cious). 
Willow (Salix): Black ( nigra) \ Peach-leaved ( aenygdaloides)) Shining 
( lucida) ; Sandbar ( longifolia)) Balsam ( balsarnifera ); Glaucous 
[discolor)) e White ( alba)\ e Yellow (vitellina \) a Weeping (baby- 
lonica) . 
Poplar ( Populus ): Trembling Aspen [tremuloides)) Largetoothed P. 
( grajidideniata ); Downy ( heterophylla ); Balsam (balsarnifera) ; 
a Balm of Gilead (ca?idicans)) Cottonwood ( deltoides )) Carolina P. 
(Eugenei Hort.); e Lombardy [nigra italica ); e Silver [alba)) a 
Bolle’s [alba Bolleana) . 
6— Walnut Family. Leaves compound, flowers monoecious. 
Walnut ( Juglans ): Butternut or White W. ( chierea ); e English [regia)) 
Black [nigra). 
Hickory [Carya): Shagbark (ovata): King nut (lacieiiosa) Mocker- 
nut [alba)) Pignut [glabra)) Bitter nut (cordifortuis). 
a Caucasian Walnut [Plerocarya fraxi?iifolia) . 
7 — Birch Family. Monoecious, both kinds of flowers in catkins. 
Birch (Betula): Gray (populifolia)) White [alba)) Black ( le?ita )) Yel- 
low (lutea)) Red [nigra). 
Alder [Alnus): e European [glutinosa) . 
Hornbeam or Blue Beech (Carpinus): American [caroliniana)) e Eu- 
ropean (Betulus). 
Ironwoodor Hop Hornbeam (Ostrya virgitiiana) . 
8 — Oak Family. Monoecious, staminate flowers only in catkins. 
Beech [Fag7is): American [grandifolia) e European (sylvatica) ,( Pur- 
ple var. and cut-leaved var.) 
Chestnut (Castanea de?itata): Chinquapin (C.pumila). 
Oak [Quercus)'. White [alba)) Swamp White [bicolor)) Post [stcllata)) 
Overcup [lyrata)) Bur [macrocarpa)) Chestnut O. [Primes)) Willow 
O. [Phellos)) Red [rube a)) Black (velutina)) Scarlet (cocci?ica)) Pin 
[palustris)) Black Jack (marilandica)) s Laurel Oak [imbricaria)) 
e English [Robur)) e Turkey ( C err is) . 
9— Elm Family. Inconspicuous flowers with sepals and petals. 
Elm [Elmus): American or White americana) (Slippery or Red 
[fulva)) Cork or Rock [raceviosa)) e English [campestris) e Scotch 
or Wych (glabra)) e Camperdown (glabra Camperdownii). 
Hackberry ( Cettis occideutalis). 
a Zelkova (Z. serrata and ulmoides). 
10— Mulberry Family. Monoecious; sap milky. 
Mulberry (Moreis): Red (rubra)) a White (alba). 
a Paper Mulberry (Rronssonctia papxrifera) . 
w Osage Orange (Macivra pomifera) . 
11— Katsura Tree Family. No sepals or petals. 
a Tetracentron ( T. sinense). 
a Euotelea (E. polyandra) . 
a Katsura Tree (Cercidiphylluni japonicum). 
12— Magnolia Family. Flowers large, all parts separate. 
Magnolia (Magnolia): s Umbrella Tree ( tripetala ); s CueumberTree 
(acuminata)) Fraser Magnolia ( Fraseri ); s Great-Leaved M. ( macro - 
phylla ): Sweet Bay (glauca)) a Soulange's M. (Soulaeigeana) . 
Tulip Tree ([Jriodendron tulipifera) . 
13 —Custard Apple Family. Small tree, 3 sepals, 3 petals, large 
fruit. 
s Papaw (Asimina triloba). 
14— Laurel Family. Leaves aromatic, three forms, fruit blue. 
Sassafras (Y. variifolium) . 
