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Spiraea douglasii is a woolly shrub growing 0.91–1.83 metres (3–6 feet) tall from rhizomes, forming dense riverside thickets. [6] The leaves are 2.5–10.2 centimetres (1–4 inches) long and toothed towards the tips. They are alternately arranged, and the undersides are whitish with prominent veins.
Spiraea / s p aɪ ˈ r iː ə /, [1] sometimes spelled spirea in common names, and commonly known as meadowsweets or steeplebushes, is a genus of about 80 to 100 species [2] of shrubs in the family Rosaceae.
Spiraea chamaedryfolia is a shrub reaching a height of 1–1.5 metres (3 ft 3 in – 4 ft 11 in). Branchlets are brownish or red-brown. Leaves are simple, oblong or lance-shaped, toothed on the edges, 40–60 millimetres (1.6–2.4 in) long and 10–30 millimetres (0.39–1.18 in) wide, with a petiole of 4–7 mm.
Spiraea japonica was introduced in North America as an ornamental landscape plant and first cultivated in the northeastern states around 1870. [5] Numerous cultivars have been selected for garden use. The tall forms may be grown as hedges, low screens, or foundation shrubs. The low-growing forms can be used as groundcover or in borders.
Growing to 1.5 m (4.9 ft) tall and broad, Spiraea thunbergii is a small, long-lived shrub with thin, flexible stems. The flowers are white, borne in abundance in spring and early summer. The flowers are white, borne in abundance in spring and early summer.
Spiraea tomentosa grows to up to four feet high and prefers moist to wet soil and full sun. It blooms in summer. Each tiny, pink flower is about 1/16 of an inch wide and arranged in narrow, pyramid-shaped flowerheads that grow up to eight inches long. The flowers are followed by small, dry, brown fruit.
Spiraea alba, commonly known as meadowsweet, [2] white meadowsweet, [3] narrowleaf meadowsweet, [4] pale bridewort, [5] or pipestem, [6] is native to the wet soils of the Allegheny Mountains and other portions of eastern North America, [7] but is currently endangered in the state of Missouri. It is naturalized in other parts of the world.
An ornamental plant featured in gardens, it is a shrub growing up to 1.5 metres (4.9 ft) tall with frothy, pompom-like clusters of snow-white flowers borne along arching branches that bloom in May in its native country, hence its common name. [4]