Very hardy; retains a compact crown. An excellent specimen plant when grouped with other evergreens on the lawn. Does not grow to large size. 21. Mugho pine (_Pinus mughus_) A low-growing evergreen; hardy; important in group planting. 22. Obtuse leaf Japanese cypress (_Retinospora obtusa_) Beautiful evergreen of small size; hardy; desirable for group planting. 23. English yew (_Taxus baccata_) An excellent evergreen usually of low form; suitable for the lawn, massed with others or as a specimen plant; will grow in the shade of other trees. There are various forms of this species of distinctive value. TREES BEST FOR THE STREET 1. Oriental sycamore (_Platanus orientalis_) Very hardy; will adapt itself to city conditions; grows fairly fast and is highly resistant to insects and disease. 2. Norway maple (_Acer platanoides_) Very hardy; possesses a straight trunk and symmetrical crown; is comparatively free from insects and disease and will withstand the average city conditions. 3. Red oak (_Quercus rubra_) Fastest growing of the oaks; very durable and highly resistant to insects and disease; will grow in the average soil of the city street. [Illustration: FIG. 93.--Street Trees. Norway Maples.] 4. Gingko (_Gingko biloba_) Hardy and absolutely free from insects and disease; suited for narrow streets, and will permit of close planting. 5. European linden (_Tilia microphylla_) Beautiful shade-bearing crown; is very responsive to good soil and plenty of moisture. 6. American elm (_Ulmus americana_) When planted in rows along an avenue, it forms a tall majestic archway of great beauty. It is best suited for wide streets and should be planted further apart than the other trees listed above. Requires a fairly good soil and plenty of moisture, and is therefore not suited for planting in the heart of a large city. 7. Pin oak (_Quercus palustris_) This tree exhibits its greatest beauty when its branches are allowed to droop fairly low. It, moreover, needs plenty of moisture to thrive and the tree is therefore best suited for streets in suburban sections, where these conditions can be more readily met. 8. Red maple (_Acer rubrum_) Beautiful in all seasons of the year; requires a rich soil and considerable moisture. TREES BEST FOR WOODLAND FOR OPEN PLACES 1. Red oak (_Quercus rubra_) Grows rapidly to large size and produces valuable wood; will grow in poor soil. 2. White pine (_Pinus strobus_) Rapid grower; endures but little shade; wood valuable; will do well on large range of soils. 3. Red pine (_Pinus resinosa_) Very hardy; fairly rapid growing tree. 4. Tulip tree (_Liriodendron tulipifera_)