prepared by the Society of American Foresters (1954) lists 
species but lacks maps. 
A few tree species have spread widely by planting or other 
introductions and have become so thoroughly naturalized that 
the limits of their original ranges are in doubt. Examples in this 
volume include three leguminous species, Prosopis juliflora, 
mesquite, Acacia farnesiana, sweet acacia, and Parkinsonia 
aculeata, Jerusalem-thorn. Other species with edible seeds or 
other useful products may have been disseminated by the 
American Indians, for example, Prunus angustifolia, Chickasaw 
plum. 
TREE NAMES 
Scientific and common names follow the Forest Service 
Check List (Little 1953), except for several minor changes in 
nomenclature. Differences in scientific names, mostly of addi- 
tions and deletions, are given below, the accepted name cited 
first. Eight species of willow, Salix, have been deleted as 
synonyms or shrubs. The first eleven changes below involve four 
generic transfers and seven other names. 
Caesalpinia mexicana A. Gray, Mexican poinciana, of Texas 
and Mexico, replaces Poinciana mexicana (A. Gray) Rose. 
Fremontodendron californicum (Torr.) Cov., California fremon- 
tia, replaces Fremontia californica Torr. 
Fremontodendron mexicanum Davidson, Mexican fremontia, 
replaces Fremontia mexicana (Davidson) Macbr. 
Guaiacum angustifolium Engelm., Texas lignumvitae, of 
Texas and Mexico, replaces Porlieria angustifolia (Engelm.) A. 
Gray. 
Acacia berlandieri Benth., Berlandier acacia, of Texas, 
replaces A. xXemoryana Benth. The latter is the hybrid A. 
berlandieri X greggii. 
Condalia hookeri M. C. Johnst., bluewood, of Texas and 
Mexico, replaces C. obovata Hook., an illegitimate name. 
Dodonaea viscosa (L.) Jaeq., hopbush, a shrubby tropical 
species north to Arizona, includes as a synonym D. microcarya 
Small, of Florida. 
Esenbeckia berlandieri Baill., Berlandier esenbeckia, of Mex- 
ico, includes FE. runyonii Morton, of extreme southern Texas. 
Forestiera angustifolia Torr., Texas forestiera, of Texas and 
Mexico, includes F’. texana Cory. 
Quercus glaucoides Mart. & Gal., Lacey oak, of Mexico, in- 
cludes Q. laceyi Small. 
Quercus rugosa Née, netleaf oak, of Mexico and border 
States, is an older name for Q. reticulata Humb. & Bonpl. 
The 20 additions which follow include three named as new to 
science and three formerly treated as varieties. The others are 
mostly large shrubs also reaching tree size. 
Acacia rigidula Benth., becomes a small tree in Texas. 
Acacia roemeriana Scheele, Roemer acacia, of Texas, 
reaches tree size. 
Arctostaphylos pringlei Parry, Pringle manzanita, rarely at- 
tains tree size in Arizona. 
Cercocarpus traskiae Eastw., Catalina cercocarpus, very rare 
and very local on Santa Catalina Island off the coast of southern 
California, formerly was regarded as a variety, C. betuloides var. 
traskiae (Eastw.) Dunkle. 
Citharexylum berlandieri Robinson, Berlandier fiddlewood, is 
reported as rarely a tree (mentioned in a note in the 1953 Check 
List). 
Cornus glabrata Benth., brown dogwood, of California and 
Oregon, becomes a small tree. 
Eysenhardtia texana Scheele (E. angustifolia Pennell), Texas 
kidneywood, added as small tree (mentioned in note in 1953 
Check List). 
Lysiloma microphylla Benth., littleleaf lysiloma, added as 
small tree (mentioned in note in 1953 Check List). 
Ostrya chisosensis Correll, Chisos hophornbeam, of Chisos 
Mountains, Texas, named in 1965. 
Populus arizonica Sarg., Arizona cottonwood, of Texas to 
Arizona accepted as species. 
Populus hinckleyana Correll, Hinckley cottonwood, of Texas, 
named in 1960. 
Ptelea crenulata Greene, California hoptree, shrub of Califor- 
nia, accepted as small tree. 
Quercus ajoensis C. H. Muller, Ajo oak, of Arizona and Baja 
California, described as new in 1954. 
Quercus dunnii Kellogg, Palmer oak, of Arizona, California, 
and Mexico, formerly was treated as a variety, QO. chrysolepis 
Liebm. var. palmeri (Engelm.) Sarg. 
Quercus macdonaldii Greene, McDonald oak, of three Califor- 
nia islands, formerly was treated as a variety, 0. dumosa Nutt. 
var. macdonaldii (Greene) Jeps., or hybrid. Q. dumosa Nutt., 
California scrub oak, is omitted as a shrub. Another former 
variety reaching tree size is now accepted as a hybrid, Quercus 
xalvordiana Eastw., Alvord oak, and not mapped. 
Quercus tardifolia C. H. Muller, lateleaf oak, of Chisos 
Mountains, Texas, named in 1936 and mentioned in note in 
1953 Check List. Cited under 0. gravesii Sudw. and not 
mapped separately. 
Rhus microphylla Engelm., littleleaf sumac, a shrub from 
Oklahoma to Arizona and Mexico, accepted as small tree 
(mentioned in note in 1953 Check List). 
Sorbus scopulina Greene, Greene mountain-ash, from Califor- 
nia to Alaska, observed to reach tree size in Alaska. 
Vauquelinia pauciflora Standl., a shrub of southeastern 
Arizona, added as small tree. 
Viburnum trilobum Marsh. V. opulus L. var. americanum 
Ait.), American cranberrybush, becomes a small tree. 
The last 15 names involve omission or deletion of names, 
mostly through union of two species or rejection as a shrub. In 
the next nine below, the second of two species, both accepted 
in the 1953 Check List, has been united and reduced to a 
synonym of the first. 
Amelanchier alnifolia (Nutt.) Nutt., western serviceberry 
(formerly saskatoon serviceberry), includes A. florida Lindl., 
Pacific serviceberry. 
Crataegus columbiana Howell, Columbia hawthorn, includes 
C. williamsti Eggl., Williams hawthorn. 
Crataegus douglasii Lindl., black hawthorn, includes C. 
rivularis Nutt., river hawthorn. 
Ptelea trifoliata L., common hoptree, includes as synonyms 
or varieties Pt. angustifolia Benth., narrowleaf hoptree, and Pt. 
pallida Greene, pale hoptree. 
Salix exigua Nutt., coyote willow, includes S. interior 
Rowlee, sandbar willow. 
Salix hookeriana Barratt, Hooker willow, includes S. ampli- 
folia Coy., Yakutat willow, of Alaska. 
Salix lasiandra Benth., Pacific willow, includes S. caudata 
(Nutt.) Heller, whiplash willow. 
Salix nigra Marsh., black willow (Atlas, Vol. 1, maps 190-N, 
190-W, and 190-E), includes S. gooddingii Ball, Goodding 
willow, of Southwestern United States and adjacent Mexico, and 
is shown on revised maps. 
a Se a ea 
