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Spiraea plants are hardy, deciduous-leaved shrubs. The leaves are simple and usually short stalked, and are arranged in a spiralling, alternate fashion. In most species, the leaves are lanceolate (narrowly oval) and about 2.5 to 10 centimetres (0.98 to 3.94 in) long.
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 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 latifolia, commonly known as broadleaf meadowsweet, is a shrub in the family Rosaceae. It has often been treated as a variety of Spiraea alba (white or narrowleaf meadowsweet). [ 1 ] It is the primary host plant for Hemileuca lucina .
Spiraea japonica is a deciduous, perennial shrub native to Japan, China, and Korea. Southwest China is the center for biodiversity of the species. [ 4 ] It is naturalized throughout much of the Northeast, Southeast, and Midwest areas of the United States, and parts of Canada.
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.
Spiraea splendens is a shrub of the rose family native to the western mountains of North America, from California to British Columbia, commonly known as dense-flowered spiraea, [citation needed] rose meadowsweet, [4] rosy spiraea, [citation needed] subalpine spiraea, [4] and mountain spiraea.
Spiraea tomentosa grows to up to four feet high and prefers moist to wet soil and full sun. It blooms in summer. 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.