84 EUCALYPTS CULTIVATED IN THE UNITED STATES. 
GROUPING OF SPECIES ACCORDING TO CHARACTERISTICS, 
CLIMATIC ADAPTATIONS, AND USES. 
For convenience of reference, the species discussed in the preced- 
ing section are here grouped according to some prominent character- 
istic, climatic requirement, or use. It is hoped that this grouping 
will be helpful in determining the name of a tree in cases of ignorance 
or doubt, and will aid planters in deciding what species to plant in a 
particular locality, or for any special use. In selecting a species for 
a particular purpose, it will, of course, be necessary to take into con- 
sideration as well what species would be likely to thrive in the locality 
where the planting is to be done. 
CHARACTERISTICS. 
BARK. 
Bark commonly smooth (‘‘Gum trees”): Hucalyptus citriodora, L. 
coriacea, FE. corynocalyx, E. rostrata, EF. saligna, and LE. tereticornis. 
Besides the above, some individuals of several species have smooth 
bark, even when well grown; and it is to be remembered that the seed- 
lings of all species have smooth bark, and that on some species the 
bark remains smooth several years longer than on others. 
Some forms of Z. amygdalina, FE. occidentalis, and FE. viminalis have 
quite smooth bark; and the bark of /. botryoides and £. rudis remains 
smooth until the trees are several years old. 
Bark distinctly fibrous (‘‘Stringy barks”): Hucalyptus eugenioides, 
E. macrorhyncha, E. obliqua, and FE. piperita. The bark of the fore- 
eoing resembles quite closely that of American cedars. 
Bark scaly and furrowed (‘‘ Box trees”): Eucalyptus calophylla, £. 
cornuta, EF. corymbosa, E. goniocalyx, E.. gomphocephala, E. hemiphlova, 
E. longifolia, FE. microtheca, E. polyanthema, E. populifolia, and F. 
stuartiana. The bark of those designated as ‘‘ Box trees” resembles 
considerably that of American ashes or maples. Besides this similarity 
of bark, most of the trees known by the above name in Australia have 
close wood of interlocked fibers. 
Bark hard and deeply fissured (*‘Ironbarks”): Hucalyptus crebra. E. 
paniculata, E. siderophloia, and E. stderoxylon. The typical ** Iron- 
bark” of the four is the last species named, the bark of the others 
being less pronounced as to hardness and unevenness. 
LEAVES. 
Leaves of seedlings opposite and stemless or short stemmed: /uca- 
lyptus coriacea, FE. eugenioides, EF. globulus, E. goniocalyx, E. leu- 
corylon, EF. macrorhyncha, E. stuartiana, and £. viminalis. Seedlings 
of the above species are quite marked in appearance, and, though 
