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A list of tree species, grouped generally by biogeographic realm and specifically by bioregions, and shade tolerance. Shade-tolerant species are species that are able to thrive in the shade, and in the presence of natural competition by other plants. Shade-intolerant species require full sunlight and little or no competition.
The roughleaf dogwood is used as an ornamental tree because of its ability to survive with little care once mature because of its tolerance to pests, low water requirements and tolerance to shade. It can grow to a height of 15 to 25 feet (4.6 to 7.6 m) with a spread of 10 to 15 feet (3.0 to 4.6 m).
The flowers commonly bloom twice per season, once in the spring and again in late summer or early fall. [5] [3] Appearing in September or October, the fruit is a compound pink-red or orange drupe about 1–1.5 cm (1 ⁄ 2 – 1 ⁄ 2 in) long. They are produced in clusters containing 20–40 drupelets, each of which contains two seeds.
Cornus sericea is a popular ornamental shrub that is often planted for the red coloring of its twigs in the dormant season. The cultivars 'Bud's Yellow', [ 11 ] 'Flaviramea' [ 12 ] with lime green stems, and 'Hedgerows Gold' [ 13 ] (variegated foliage) have gained the Royal Horticultural Society 's Award of Garden Merit (confirmed in 2017).
Cornus mas Cornus florida in spring Cornus drummondii in flower Mature and immature flowers of Cornus canadensis, Bonnechere Provincial Park, Ontario Cornus canadensis fruit Spring budding Cornus is a genus of about 30–60 species [ Note 1 ] of woody plants in the family Cornaceae , commonly known as dogwoods or cornels , which can generally ...
The flowers themselves are pedunculate with 4 calyx lobes and 4 petals. The cymes are 3–6 cm (1 + 1 ⁄ 4 – 2 + 1 ⁄ 4 in) wide and contain 20–50 flowers. Fruits are blue to greenish white drupe that matures in October. [5] [6] Roundleaf dogwood prefers well drained to normal moisture soil and, like most dogwoods, is shade tolerant. [7]
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The leaves are 4–8 cm (1 + 1 ⁄ 2 – 3 + 1 ⁄ 4 in) long and 1–4 cm (1 ⁄ 2 – 1 + 1 ⁄ 2 in) wide, and typically have 3 or 4 pairs of lateral veins, fewer than other dogwood species. [4] The plant grows upright with a rounded habit, oppositely arranged leaves, and terminally born flowers.