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Ambrosia psilostachya
DC.
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| Western ragweed, an aromatic
perennial growing from rhizome-like rootstocks, is a very common weed
of roadsides, dry fields and disturbed and waste places to about 2500'.
It occupies coastal sage scrub and chaparral communities, both cismontane
and in parts of the Colorado Desert, and has once-pinnatifid, coarse-lobed
leaves characterized by a greenish, rough pubescence. Male and female
flowers develop on the same plant, the male flowers above and nodding,
the female flowers below in the leaf axils. There are no spines
on the involucre as in A. acanthicarpa. Western ragweed blooms
from July to November. Click here for Latin name derivations: 1) Ambrosia 2) psilostachya. Pronunciation: am-BRO-zee-a sy-lo-STAY-kee-a. Click here for Botanical Term Meanings. |
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