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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.
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. They are native to the temperate Northern Hemisphere, with the greatest diversity in eastern Asia.
Clusters of rosy-pink flowers are found at the tips of the branches. The seeds measure about 2.5 mm in length and are found in small lustrous capsules. [4] It is naturally variable in form and there are many varieties of it in the horticulture trade. So far, nine varieties have been described within the species. [4]
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.
Spiraea japonica var. alpina, also known as the alpine spirea or daphne spirea, is a low-growing, rounded, deciduous shrub that has pink flowers in flat-topped clusters in late spring to mid summer. The leaves are small, oval, sharply toothed, and blue green-colored.
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.
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.
Sorbaria sorbifolia, the false spiraea, [2] is a species of flowering plant in the family Rosaceae.The common name is also spelled false spirea.Other common names include false goat's beard, sorb-leaved schizonotus, Ural false spirea, and in Chinese: 珍珠梅; pinyin: zhen zhu mei; lit. 'pearl plum'.