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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. The leaf margins are usually toothed, occasionally cut or lobed, and rarely ...
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.
Later she suggested using the names A. pomi and A. spiraecola on the basis of the plants on which they were found [7] [8] [9] thus leading to the names each species is known by today. Another species, A. citricola was described by van der Groot in 1912 while doing a study in Chile.
Instead, it reproduces vegetatively by cloning, producing many new sprouts which grow into shrubs. [5] There are fewer than 30 genotypes in total, meaning there are fewer than 30 individual sets of genes; all the other plants are clones of one of the 30 types. [1] This plant is a rare member of the flora in the southern Appalachians.
It is a deciduous or semi-evergreen shrub that reaches a size of 1–2 m height, with many thin branches, arched, flexible and glabrous.The leaves are alternate, simple, small petiolate, with 2–6 cm long green lanceolate, elliptical-rhomboidal or slightly obovate lamina, with 3 nerves parallel from its base, irregularly crenate-dentate in its distal half.
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.
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.
The characteristics of these natural chemicals indicate a potential role of cis-cinnamic acid and its glucosides as allelochemicals (chemicals, released from plants, that cause an interaction between plants and other living organisms) for use as plant growth regulators and weed suppression in agricultural fields and natural ecosystems.