Ambrosia Psilostachya
''Ambrosia psilostachya'' is a species of ragweed known by the common names Cuman ragweed and perennial ragweed, and western ragweed. Distribution and habitat The plant is widespread across much of North America (United States, Canada, and northern Mexico). It is also naturalized in parts of Europe, Asia, Australia, and South America. It is a common plant in many habitat types, including disturbed areas such as roadsides. Description ''Ambrosia psilostachya'' is an erect perennial herb growing a slender, branching, straw-colored stem to a maximum height near two meters, but more often remaining under one meter tall. Leaves are up to 12 centimeters long and vary in shape from lance-shaped to nearly oval, and they are divided into many narrow, pointed lobes. The stem and leaves are hairy. The top of the stem is occupied by an inflorescence which is usually a spike. The species is monoecious, and the inflorescence is composed of staminate (male) flower heads with the pistillate h ...
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Ambrosia (plant)
Ragweeds are flowering plants in the genus ''Ambrosia'' in the aster family, Asteraceae. They are distributed in the tropical and subtropical regions of the Americas, especially North America,''Ambrosia''
Flora of North America. where the origin and of the genus are in the and northwestern . Several species have been
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