(City Flowers in 4 Cities - Xining, Hohhot, Harbin, Shizuishan)
The scientific name of this plant is *Syringa* spp., commonly known as lilac. It is also referred to by several local names such as "hundred knot" or "lover," and belongs to the Oleaceae family, which includes other familiar plants like olive and jasmine.
Lilac is a deciduous shrub or small tree, typically growing up to 3–5 meters in height. Its winter buds are ovate and covered with scales, providing protection during cold seasons. The leaves are opposite in arrangement, usually elliptic or lance-shaped, with a petiole (leaf stalk). They are generally entire, though some varieties may show slight division or even pinnate compound structure.
The flowers are bisexual and appear in terminal or lateral clusters, forming conical inflorescences. Each flower has a funnel-shaped corolla with four lobes, and their colors range from white to purple, magenta, and blue. Lilacs are most commonly associated with springtime blooms, flowering between April and June. After blooming, they produce oblong capsules that are smooth or sometimes ribbed. These fruits split open along the back, releasing seeds for propagation.
In the cities of Xining, Hohhot, Harbin, and Shizuishan, lilacs are not only ornamental but also symbolize beauty and resilience, often thriving in the local climate despite harsh winters. Their fragrant blossoms make them a popular choice for parks, gardens, and public spaces. Whether viewed in full bloom or as part of the natural landscape, lilacs add a touch of elegance and charm to these urban environments.
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Flame retardants, functional auxiliaries endowed with inflammable polymer flammability, mainly designed for flame retardancy of polymer materials; There are many types of flame retardants, which can be divided into additive flame retardants and reactive flame retardants according to their usage.
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