1.Acer davidii
Common name: Snakebark maple
Family name: Aceraceae
Useful Cultivars and Selections: ‘Ernest Wilson’, ‘George Forrest’
USDA Hardiness Zone: 5
Mature height and spread:10-15m tall, long, arching branches.
Form:upright, slightly spreading, variable.
Water use:Medium
Soil requirement:Moisture, well-drained soils. Prefers acidic soils that are kept consistently moist.
Leaf arrangement:Opposite
Fall colour:Bright yellow, orange or red.
Flower/ Cone/ Fruit description:Small yellow flower with 5 sepals & 5 petals in April.
Suitable uses:Attractive small tree or large shrub for the landscape, used as a specimen plant.
Limitation:No serious pests or diseases. Potentially susceptible to verticillium wilt, leaf spots, tar spot, canker and root rots. Insects include aphids, scale, borers, caterpillars, and mites.
Quick ID description:Opposite, slightly heart-shaped, unevenly toothed leaves.
2.Acer griseum
Common name: Paperbark Maple
Family name: Aceraceae
Useful cultivars and selections: ‘Ginzam’
USDA Hardiness Zone: 6
Mature height and spread: 6-9m
Form: Oval to oval-rounded tree with slender upright branching
Water use: Medium
Soil requirements: moist, well-drained soils
Leaf arrangement/Foliage: opposite
Fall colour: orange and red
Flower/cone/fruit description(s): yellow flowers are androdioecious, produced in small pendent corymbs in spring / fruit being a paired samara with two winged seeds about 1 cm long with a 3 cm wing
Limitations: Intolerant of drought
Suitable uses: Deserves a location where its ornamental features can be appreciated (near a deck or patio). Appropriate as an understory tree in a woodland garden or as a specimen in many locations around the home. Shade Tree。
Quick ID description: compound leaf, 3-leaflets, peeling orange bark distinctive / trifoliate leaves and exfoliating cinnamon-brown bark / buds sharply pointed and dark purplish-brown
3. Acer macrophyllum (N)
Common name: Bigleaf maple
Family name: Aceraceae
Useful cultivars and selections: Western or Oregon Maple
USDA Hardiness Zone: 5-9
Mature height and spread: 80-100 ft (25-30 m) tall/wide
Form: Round
Water use: Prefer moist sites
Soil requirements: well-drained soil, can grow in heavy clay soil.
Leaf arrangement: opposite
Fall colour: yellow
Flower/cone/fruit description(s): flower: yellow
Limitations: Young, undamaged trees are generally free of serious disease or decay. Old or damaged trees commonly have serious defects caused by wood-rotting fungi
Suitable uses: planted in larger yards or parks/ street tree
Quick ID description: The leaf is big, 20-60 cm in length.
4. Cercidiphyllum japonicum
Common name: katsura tree(or katsura),Caramel tree
Family name: Cercidiphyllaceae
Useful cultivars and selections: ‘Aureum’, ‘Heronswood Globe’, and ‘Ruby’
USDA Hardiness Zone: 4-8
Mature height and spread: 12m/ 8m
Form: Oval, spreading, upright
Water use: Medium
Soil requirements: Clay soil, Acid to neutral
Leaf arrangement/Foliage: opposite
Fall colour: gold orange or red
Flower/cone/fruit description(s): not significant
Limitations: has little tolerance for drought particularly when young. The leaves may be damaged by late frosts
Suitable uses: Shade tree/ street tree
Quick ID description: heart-shaped base of the leaf
5.X Chitalpa tashkentensis
Common name: Chitalpa
Family name: Bignoniaceae
Useful cultivars and selections: Pink Down; Morning Cloud
USDA Hardiness Zone: 6 to 9
Mature height and spread: 20.00 to 35.00 feet/20.00 to 35.00 feet
Form: Partially to fully deciduous small tree, open, airy
Water use: Medium
Soil requirements: deep, moderately fertile, medium moisture, well-drained soils
Fall colour: green
Flower/cone/fruit description(s): 15 to 40 flowers in a terminal raceme, corollas are zygomorphic, calyx are 2-lobed, color is white to pale or dark pink and often with distinct purple veins, flowers are sterile and produce no fruit.
Limitations:
Powdery mildew can be a significant problem in growing areas with high summer humidity (e.g., the southeastern U. S.) and in growing conditions where trees are planted in too much shade. Additional disease problems include verticillium wilt, root rot and leaf spots. Watch for aphids, mealybugs, scale and whiteflies.
Disease and pests: This hybrid tree is highly subject to Thielaviopsis root rot, whereas foliar powdery mildew is usually confined to wet spring conditions.
Suitable uses: residential tree, smaller park tree, street tree with a long summer flowering period.
Quick ID description: Lanceolate leaves, dull green.
6.Davidia involucrata
Common name: Handkerchief tree
Family name: Cornaceae
Useful cultivars and selections:
- involucrata var. involucrata, which has the leaves thinly pubescent (short-haired) on the underside;
- involucrata var. vilmoriniana, with glabrous (hairless) leaves
USDA Hardiness Zone: 5
Mature height and spread: 20-25m/15m
Form: deciduous tree that typically grows 20-40’ tall with a broad pyramidal habit
Water use: Well-drained
Leaf arrangement/Foliage: alternate
Fall colour: green
Flower/cone/fruit description(s):
Flowers: Borne in compact, roughly spherical, reddish purple flower heads, about 2 cm in diameter. Flower heads are overshadowed by a pair of thin, white bracts, the longest one being up to 30 cm long and about twice the size of the other. The delicate bracts flutter in the breeze giving rise to the common names handkerchief, dove and ghost tree. Blossom time: April to may
Fruits: Hard, dark-green nuts, which turn purple when ripe. Each fruit contains 6–10 seeds. Seeds germinate erratically, and trees may need 10–20 years to flower. Fruit time: October
Flowers form a tight cluster about 1-2 cm across, and produces two pure white leaf-like bracts(works like raincoat) that sit on either side of the cluster.
The fruit is a very hard nut about 3cm long surrounded by a green husk about 4 cm long by 3cm wide.
Limitations: No particular limitations
Suitable uses: Grown as an ornamental in low maintenance architectural city, courtyard gardens cottage, informal garden patio, container plants
Quick ID description: White wax (can be rubbed off) over the back of leaf ,Long-shoot short-shoot morphology, tooth leaf edge
7. Euonymus planipes
Common name: dingle-dangle tree
Family name: Celastraceae
Useful cultivars and selections: ‘Sancho’ is a free-flowering cultivar of E. planipes, leading to an abundance of red fruits in autumn, along with red autumn foliage
Mature height and spread: 2.5m/2.5m
Form:deciduous or evergreen shrubs or small trees
Water use: medium
Soil requirements: well-drained
Leaf arrangement/Foliage: opposite
Fall colour: red
Flower/cone/fruit description(s):
Fruit: Capsular, dry, pinkish red fruits with orange-covered seeds.Split to reveal vivid-orange seeds
Flower: Occur in small groups, inconspicuous and of green or yellow shades
Limitations: Poisonous
Suitable uses: Flower borders and beds. Cast shade in a woodland planting scheme and under-plant with early-flowering oriental hellebores, wood anemones and snowdrops. 5 months (winter) without leaves
Quick ID description: Capsular fruit, red leaf colour in fall, maginal teeth, the terminal bud at the end of the branch is bigger than the axillary buds.
8.Ginkgo biloba
Common name: Ginkgo
Family name: Ginkgoaceae
Useful cultivars and selections:
Ginkgo biloba ‘Fastigiata’:Fastigiate or columnar ginkgo forms have been available in commerce for over 100 years. Nurseries often sell these forms under several different labels including Ginkgo biloba forma fastigiata, G. b. fastigiata or G. b. ‘Fastigiata’. These fastigiate forms (fastigiate meaning upward branching) typically grow 30-50′ tall with upright, narrowly conical habits that are just slightly broader at the base. ‘Fastigiata’ is an all-male cultivar. Leaves turn a uniform golden yellow in autumn (spectacular when backlit by early morning or late afternoon sun) and persist for several weeks. When the leaves do drop, they drop rapidly, forming a golden carpet around the tree.
Ginkgo biloba ‘Magyar’:An introduction that is gaining momentum in the trade, this plant is a non-fruiting male with upright, ascending branching to 60′ tall and half as wide. It is well-suited to urban planting as a street tree.
Ginkgo biloba ‘Chi-Chi’ :Dwarf, dense, mounded, slow-growing, multi-stemmed shrub form of the popular ginkgo tree. It typically grows to only 4-5′ tall with a fan-shaped habit and over 10 years. ‘Chi-Chi’ is a male clone. Its cultivar name translates as “breasts” in reference to unusual swellings (clusters of dormant buds) which appear on the bark of plants as they mature (usually after 10 years). Leaves turn a uniform golden yellow in autumn.
Ginkgo biloba ‘Tubifolia’ :‘Tubifolia’ (synonymous with ‘Tubiformis’ and ‘Tubeleaf’) is a tubular-leaved, slow-growing male form that typically grows to only 3-4’ tall over the first five years. It is particularly noted for having variable leaf shapes. On younger trees, leaves typically roll inward forming tube. As trees grow older, the leaves tend to flatten out, but with a more laciniate form than species leaves. This tree may eventually mature to as much as 20-25’ tall. Light green leaves turn an excellent golden yellow in fall.
Ginkgo biloba ‘Jade Butterflies’: An unusual dwarf, slow-growing form, this plant has bright green leaves and a mature height that is less than half that of standard forms. It’s an introduction out of New Zealand that is gaining popularity.
Ginkgo biloba ‘Shangri-La’ :’Shangri-La’ is a more compact well-branched tree with a full and balanced crown. It typically matures to 55′ tall and to 40′ wide. It is a male tree that was discovered in 1963 in a planting of seedlings in Urbana, Illinois by Willet N. Wandell. U. S. Plant Patent PP 5,221 was issued on April 17, 1984. Patent documents describe the unique features of this male tree as: (a) rapid compact growth habit, (b) dense full crown with balanced moderate spread, and (c) freedom from production of the foul smelling fruit produced by female plants. As with species plants, the fan-shaped leaves are rich green to blue green during the growing season, but change to an often spectacular bright yellow in fall. Dangling staminate catkins (April-May) are not ornamentally significant.
Ginkgo biloba ‘Troll’ :‘Troll’ is a dwarf shrubby cultivar that matures over time to only 3′ tall and as wide. It typically grows in a bushy mound, although it can be trained to grow as a small pyramidal tree. As with species plants, the fan-shaped leaves (biloba means two-lobed) are rich green to blue green during the growing season, but change to bright yellow in fall.
Ginkgo biloba ‘Mariken’:Can‘t find description
Ginkgo biloba ‘Autumn Gold’: This male (non-fruiting) selection is common in the trade and notable for its symmetrical crown that is broad and rounded. The mature size is 50′ tall with a 30′ spread and fall color is an excellent deep yellow.
Ginkgo biloba ‘Pendula’:Plants listed under this name are quite variable, with few expressing a strong weeping habit. Most bear branches that are horizontal or droop slightly
Ginkgo biloba ‘PNI 2720’:A very popular non-fruiting male form, this form assumes an upright habit that tapers to the point. It reaches 60′ tall, but only 25’ wide.
Ginkgo biloba ‘ Saratoga’:Commonly offered, this plant has a strong central leader and an upright, narrow habit (40′ tall and 30’ tall).
Ginkgo biloba ‘ Variegata’:Many different clones are offered under this name, but most feature leaves that are irregularly streaked with yellow.
USDA Hardiness Zone: 3-8
Mature height and spread: 40′-80/30′-40′
Form: decidious tree, spreading lateral branches
Water use: medium, tolerent to drought
Soil requirements: moist, sandy, well-drained soil
Leaf arrangement/Foliage: long shoot short shoot
Fall colour: yellow
Flower/cone/fruit description(s):
Fruit: Naked seed produced on female tree only; clusters of 2-6; light orange to tan color; flesh covering seed has a foul smell, often described as rancid butter.
Limitations: The branches may spread too wide, the fruits have bad smell after mature
Suitable uses: street tree, lawn tree, shade tree.
Quick ID description: fan-like leaves, long shoot short shoot morphology, fruits
9.Koelreuteria paniculata
Common name: Goldenrain tree
Family name: Sapindaceae
Useful cultivars and selections:
‘Coral sun’;
‘Fastigiata’, with a narrow crown;
‘September Gold’, flowering in late summer
USDA Hardiness Zone: 5
Mature height and spread: 6-10m/4-8m
Form: decidious tree,hemispherical, with space ascending branching
Water use: medium
Soil requirements: well-drained
Leaf arrangement/Foliage: alternate
Fall colour: green, yellow
Flower/cone/fruit description(s): The flowers are yellow, with four petals, growing in large terminal panicles 20–40 cm (8–16 in) long. The fruit is a three-parted inflated bladderlike pod 3–6 cm long and 2–4 cm broad, green ripening orange to pink in autumn, containing several dark brown to black seeds 5–8 mm diameter.
Limitations: intolerant of wetland / need well-drained soil
Suitable uses: street tree.
Quick ID description: the leaflets lobed or lobe-toothed, emerging hot pink, coppery or bronze, turning yellow in the fall, heart-shaped fruit
10. Sorbus ‘Joseph Rock’
Common name: mountain ash ‘Joseph Rock’
Family name: Rosaceae
Useful cultivars and selections: ‘ joseph rock’
USDA Hardiness Zone: 6
Mature height and spread: 8-12m/4-8m
Form: round-headed deciduous small tree
Water use: medium
Soil requirements: moist, well-drained, acidic to neutral
Leaf arrangement/Foliage: alternate
Fall colour: orange/ purple
Flower/cone/fruit description(s): White or pink flower blossom in May; Yellow or pink or red or brown or white berries in autumn; fruit edible
Limitations: Well drained environment needed; not resistant to drought; flower smells bad; May be affected by apple canker and fireblight; May be attacked by aphids, blister mites and sawflies
Suitable uses: Screening; Garden Tree; Small garden Tree; City/Urban Sites due to tolerance to pollution
Quick ID description: Alternate leaf arrangement with leaflets; stinky flowers; berry-like fruits; distinctive autumn leave and fruit colours
11. Styrax japonicus
Common name: Japanese snowbell
Family name: styracaeae
Useful cultivars and selections: S. ‘Pink Chimes’ and S. ‘Snowcone’.
USDA Hardiness Zone: 5-9
Mature height and spread: 5-7m
Form: 0′ to 30′ tall deciduous flowering tree, broad, flt-topped canopy, branching is horizontal, single trunked
Water use: medium
Soil requirements: well-drained soil in full sun or part shade
Leaf arrangement/Foliage: alternate
Fall colour: brown
Flower/cone/fruit description(s):
flower: hang below foliage, 5-lobed with yellow stamens, in group of 3-6
fruit:dry-rounded drupes
Limitations: lack of cold tolerence, can not tolerate compact soil
Suitable uses: Garden use, beautiful white flowers in summer and attractive fruit in winter.
Quick ID description: flowers and fruits in groups of 3-6
12. Vaccinium parvifolium (N)
Common name: red huckleberry
Family name: Ericaceae
USDA Hardiness Zone: 5-9
Mature height and spread: 4m
Form: deciduous shrub, the stems and twigs slender, sharply angled (like V. myrtillus) when young
Water use: moist
Soil requirements: acidic with significant decaying organic matter
Leaf arrangement/Foliage: alternate
Fall colour: red
Flower/cone/fruit description(s):
Flower: yellow-white to pinkish-white with pink, decumbent bell-shaped 4-millimetre (0.16 in) to 5-millimetre (0.20 in) long.
Fruit: edible red to orange berry 6-millimetre (0.24 in) to 10-millimetre (0.39 in) in diameter.
Limitations: Requires shelter from strong winds[200]. Dislikes root disturbance, plants are best grown in pots until being planted out in their permanent positions
Suitable uses: Erosion control, hedge/screen, massing plant, natural woodland gardens, ornamental fruit, attracts wildlife.
Quick ID description: Ovate to oblong-elliptic, 9-millimetre (0.35 in) to 30-millimetre (1.2 in) long, and 4-millimetre (0.16 in) to 16-millimetre (0.63 in) wide, with an entire margin.
It has sharply angled, slender green branches that become grayish-brown as they mature.
13. Vitex agnus-castus
Common name: Vitex
Family name: Lamiaceae
Useful cultivars and selections: ‘Silver Spire’ and ‘Alba’ have white flowers, and ‘Rosea’ has pink flowers.
USDA Hardiness Zone: 6-9
Mature height and spread: 2-5m/1.5-2.5m
Form: vase-shaped, deciduous shrub/ 3-5′ tall herbaceous perennial in cold area
Water use: medium
Soil requirements: well-drained
Leaf arrangement/Foliage: compound, palmate,
Fall colour: green
Flower/cone/fruit description(s): Showy, fragrant, violet and blue colour in July to August.
Limitations: Leaf spot and root rot are occasional problems. Winter hardiness in St. Louis is a problem.
Suitable uses: Garden use, interesting foliage and late summer flowers are attractive in shrub borders.
Quick ID description: palmate leaves. purple flowers
Sourses of Information:
https://www.rhs.org.uk/
http://www.hort.uconn.edu/plants/index.php
Sunset Western Garden Book, Lane publishing, Palo Alto, Califonia