FOREST TREES AND FOREST REGIONS OF THE U. S. 



31 



Name of tree 



Where the tree grows 



Descriptive notes 



Western choke cherry 

 (Prunus demissa). 



Black choke cherry (Pru- 

 nus melanocarpa) . 



Southwestern black cherry 

 (Prunus vir ens). 



Hollyleaf cherry (Prunus 

 ilicifolia). 



Catalina cherry (Prunus 



lyonii). 

 (Name?) (Lysiloma wat- 



soni) . 



C atclaw (una-de-gato) * 

 (Acacia greggii) . 



(Mimosa)* (Leucaena re- 



tusa). 

 Mesquite (Prosopis juli- 



flora). 



Honey mesquite (Prosopis 

 glandulosa) . 



Velvet mesquite (Prosopis 



velutina) . 

 Screwbean (Strombocarpa 



odorata) . 

 California redbud (Cercis 



occidentalis) . 

 Jerusalem-thorn (Parkin- 



sonia aculeata) . 

 Littleleaf horsebean (Par- 



kinsonia microphylla) . 

 Paloverde (Cercidium tor- 



reyanum). 

 Mescalbean (Sophora se- 



cundiflora) . 



Coralbean (Sophora 



afflnis) . 

 (Name?) (Eysenhardtia 



polystachia) . 

 Smokethorn (Parosela 



spinosa). 

 New Mexican locust (Ro- 



binia neo-mexicana) . 



Tesota (Olneya tesota) 



Hoptree (Pielea trifoliata) . 



(Name?) (Bursera micro- 

 phylla) . 



Mahogany sumach (Rhus 

 integrifolia) . 



Laurel sumach (Rhus 

 (lamina). 



Canotia (Canotia hola- 

 cantha) . 



Bigleaf maple (Acer ma- 

 crophyllum) . 



Vine maple (Acer circina- 

 tum). 



Rocky Mountain maple 



(Acer glabrum) . 

 Douglas maple (Acer 



douglasii) . 

 Southwestern maple (Acer 



brachypterum). 

 Bigtooth maple (Acer 



grandidentatum) . 

 Boxelder (Acer negundo 



var. violaceum). 



Inland boxelder (Acer in- 

 terim) . 



California boxelder (Acer 

 californicum) . 



Southwestern New Mexico, south- 

 ern California. 

 Southern Rocky Mountains 



Western Texas, New Mexico, Ari- 

 zona. 



Coast mountains of southern Cali- 

 fornia. 



Coast Islands, including Santa Cata- 

 lina, Calif. 

 Southern Arizona 



Western Texas, southern New Mex- 

 ico, Arizona. 



Southern parts of Texas and New 



Mexico. (See also p. 18.) 

 Texas, Oklahoma, New Mexico, 



Arizona, California. 



Kansas to California and southward. 

 (See also p. 18.) 



Southern Arizona. 



Western Texas to California, Utah, 



Nevada. 

 Coast ranges and lower slopes of 



Sierras, Calif., Utah. 

 Texas, Arizona ,... 



Southern parts of Arizona and Cali- 

 fornia. 



Southern parts of Arizona and Cali- 

 fornia. 



Southern parts of Texas and New 

 Mexico. 



Southern California east to Missis- 

 sippi River. (See p. 18.) 

 Western Texas to Arizona 



Deserts of Arizona, California 



Southern Rocky Mountain region. 



Deserts of Arizona, California 



Eastern United States, southern 

 Rocky Mountains. (See also 

 p. 19.) 



Arizona, southern California 



Coast region of southern California. 



Arizona, southern California 



-_.do 



Coast of California, Oregon, and 



Washington. Alaska. 

 Pacific coast region 



Plains and western mountains 



Northern Rocky Mountain and 



northern Pacific regions. Alaska. 



Southern New Mexico 



Rocky Mountains, from Montana 

 and Idaho to Mexico. 



Eastern half of United States; this 

 variety in northern Rocky Moun- 

 tains. (See also p. 20.) 



Rocky Mountain region (Canada to 

 Mexico) . 



Southern half of eastern California- 



Leaves often heart-shaped at base, and 



fine-hairy below. 

 Leaves thicker and fruit darker than 



above. 

 Leaves small, elliptical, finely toothed. 



Fruit purplish black, in long clusters. 

 Leaves broadly oval, coarsely and 



sharply toothed, leathery. Fruit 



dark purple. 

 Leaves thick, shiny, slightly toothed. 



Fruit purple to nearly black. 

 Leaves small of leaflets, densely hairy. 



Flowers in round head. Pods 1 inch 



wide. 

 Leaves small, of 1 to 3 pairs of leaf 



clusters (pinnae). Pods flat, twisted, 



2 to 4 inches long. 

 Leaves featherlike compound of many 



leaflets. 

 Leaves doubly compound (mostly 2 



pinnae) each with 12 to 22 leaflets. 



Pods flattened, in small clusters, 



remaining closed. 

 Leaves generally similar to above, 9 



inches long, leaflets often 2 inches 



long. 

 Leaves similarly compound, 5 to 6 



inches long, finely hairy. 

 Leaves smaller than above. Pods 



small, spirally twisted or screwed. 

 Leaves broad, rounded, heart-shaped 



at base. Flowers rose color. 

 Leaflets 50 to 60, small. Spiny stems. 



Leaves tiny, of few pairs of leaflets. 

 Flowers pale yellow. 



Leaves 1 inch long, of few tiny leaflets. 

 Branches with yellow-green bark. 



Leaves 4 to 6 inches long, of 7 to 9 

 rounded leaflets. Pods narrowed be- 

 tween seeds. 



Leaves of 13 to 19 leaflets. Pods 

 bearded. 



Leaves of 20 to 46 leaflets, terminal. 



Branches spiny. Leaves soon drop- 

 ping. 



Leaves of 15 to 21 broad leaflets. 

 Flowers rose to white. Pods 3 

 inches long. 



Leaves tiny, compound. Flowers 

 purple. 



Leaves 3-divided, alternate on stem. 

 Seed enclosed in thin, papery, cir- 

 cular wing. 



Leaves of tiny leaflets. Fruit 3-angled. 



Leaves not compound, edges prickly. 

 Thick fruit in terminal clusters. 



Leaves not compound, evergreen, aro- 

 matic. 



Tree leafless. Twigs ending in spines. 



Leaves opposite, 10 inches across, on 



long stems, 3 large and 2 small lobes. 

 Low tree, almost vinelike, in thickets, 



leaves opposite, rounded, with 7 to 9 



lobes. 

 Leaves opposite, rounded, 3-lobed or 



parted, toothed. 

 Leaves 3-lobed. Keys with erect, 



broad wings. 

 Leaves hairy, small. Keys short. 



Leaves opposite, thick, firm, green, 

 shiny above, fuzzy below, 3-lobed. 



Leaves opposite, thin, mostly com- 

 pound of 3, 5, or 7 leaflets. Twigs 

 greenish. 



Leaves compound, opposite, thick, not 

 densely hairy. Young twigs smooth. 

 Keys spreading. Hardiest boxelder 

 and widely planted. 



Leaves thick, opposite, mostly com- 

 pound, densely hairy below. Young 

 twigs velvety. Keys parallel. 



