Ambrosiaspp
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Last Update: 2020-11-18
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Source: Internet
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Author: User
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chrysanthemum, the commonly known as the genus of guinea pigs. A year of herbs. Leaves are born or each other, or the whole edge may be cracked. Head-shaped flower sequence is small, mono sex, male and female, male-shaped flower sequence in the branch end dense into a leafless spike-shaped or total-shaped flower sequence, female head-shaped flower sequence in the upper leaf single or dense group umbrella- Breeding of both sexes, total slivers
5
to
12
, base binding; The lean fruit is egg-shaped and hidden in a hard total. This genus is about
10
species, mainly produced in the Americas. The leaves of
(A. artemisifolia
) are mutually ingowed and feathered. The leaves of the tri-cracked
(A.trifida
) are lying raw, and the palms
3
5
cleavage. Both are native to North America, in recent years in China's northeast, north China, central China are seen to produce weeds, both are included in China's quarantine weeds, its pollen is the main allergenic source of pollen allergenic disease.
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