20 



AMERICAN FOREvSTRY 



constant cutting back. Wood soft, 

 brittle, and limbs or tops frequently 

 broken in storms. Surface roots raise 

 flagstones and crack concrete walks, 

 and the thick trunks push curb stones 

 out of line. Fine rootlets clog drains, 

 leaves fall during srmimer. Short-lived. 

 Seed of female cottonwood objection- 

 able. 



Silver Maple. — Grows rapidly, but is 

 short lived, and has brittle weak 

 branches which break easily in storms. 

 It is hard to prune and is affected by 

 serious insect pests and fungus diseases. 



Sycamore Maple. — Resembles the Nor- 

 way Maple in habit of growth, but 

 less desirable, and is subject to borers. 



Box Elder. — Grows rapidly and under 

 adverse conditions, but has a scraggy 

 crown, branches easily broken, and 

 twigs die readily ; it is badly infested by 

 insects, and the leaves start falling in 

 summer. 



Male Ailanthus. — The staminate or 

 male flowers of Ailanthus produce a 

 strong and highly disagreeable odor. 

 This can be avoided liy planting the 

 female form of the tree. 



Catalpa. — Common catalpa forms a 

 short crooked trunk, and an irregular 

 head. Not at all suited for street 

 planting. 



Hardy Catalpa is straight and with a 

 well-formed crown, but requires good 

 soil. Both species subject to enemies 

 and are better as ornamental trees. 



Horse Chestnut. — Leaves discolor, 

 shrivel and fall in early summer. Sub- 

 ject to attacks of many insects and fungi. 



The Conifers. — Are highly decorative 

 for lawns and parks, but they cannot 

 stand a smoky, dusty atmosphere, and 

 the removal of the lower branches 

 disfigures the trees. 



FOR OTHER THAN STREET PLANTING 



For private grounds and parks. — A 

 great variety of trees may be used. 

 Any tree native to the region or to 

 regions of similar climate will grow if 

 soil and moisture conditions are similar 

 or if made equal by a change of soil. 

 The species should be selected for its 

 adaptability to existing soil and mois- 

 ture conditions, and for its suitability, 

 when full-grown, to the particular 



purpose for which it is desired — orna- 

 ment, shade, protection, screen, etc. 

 Time is well spent in observing the 

 growth of the native and planted trees 

 of the region. 



Roadside trees. — All of the trees listed 

 for street planting and many of those 

 named for private grounds may be used. 

 The selection of species and the spacing 

 should be governed by the soil and local 

 conditions, but care should be taken 

 that the shading of roadway and 

 adjoining property will not be detri- 

 mental. 



GENERAL INFORMATION 



Trees preferring wet soil. — Pin oak. 

 Bald cypress, Oriental sycamore, Swamp 

 white oak. Willow oak. Sweet giun. Red 

 maple. White birch. Black ash, Tama- 

 rack, Willows and poplars. 



Tall trees with large spreading crowns. 

 — American elm. Tulip tree. Red oak, 

 American sycamore, Honey locust, 

 White oak, Horse chestnut. White ash, 

 Black walnut. 



Trees ivith narroiv pyramidal crowns. — 

 Ginkgo, Bald cypress, European larch, 

 Norway spruce, Colorado blue spruce, 

 Arbor vitae. Red cedar, Red fir. Hem- 

 lock, Lombardy poplar. 



Trees with very large leaves. — Catalpa, 

 Paulonia, Ailanthus, Great flowered 

 magnolia. Cucumber tree, Kentucky 

 coffee tree. Black walnut, Hercriles club. 



Trees with narrow or finely cut leaves. — 

 Honey locust. Bald cypress, European 

 larch. Willow oak. Black cherry. Su- 

 mach, cut-leaved varieties of many other 

 species and most conifers. 



Broad - leaved evergreens. — American 

 holh^ Great flowered magnolia, Swamp 

 magnolia. Rhododendron, Mountain 

 laurel. 



Trees with fragrant floivers. — Swamp 

 magnolia. Lindens (American and Euro- 

 pean), Black locust. Honey locust, 

 Yellowwood, Wild crab apple. Wild 

 plum, Cherries, Hawthorns, Jime berry. 



Trees with showy white flowers 

 (Blooming before the leaves). — Flow^er- 

 ing dogwood, June berry, Plums, Cherries 

 (blooming after the leaves); Catalpa, 

 Horse chestnut. Buckeye, Magnolias, 

 Basswood, Yellow-wood, Black locust, 

 Hercules' club. Mountain ash, Rhodo- 



