Arizona Naturalist >>> Sonoran Desert Naturalists >>> Field Guide >>> Sonoran Desert Flora >>> Asteraceae >>> Ambrosia deltoidea
Illustrated from live specimen found at South Mountain, Phoenix, Maricopa Co., Arizona. 08 March 1993. a) involucre (head) of one to three pistillate (female) flowers, b) involucre of 20 - 30 staminate (male) flowers, c) a tephritid fruit fly, Eurestoides sp. that feeds as a larva within the developing seeds.
are composite flowers with male and female flowers in separate heads on the
same plant. The terminal spikes have several heads of only female flowers below
and a larger number of exclusively male-flowered heads above. The petals are
vestigial yet the male flowers appear yellow because of the copious pollen.
Anemophilous pollination means that during the spring blooming period
allergy patients will sufferer and most everyone else will at least notice the
abundant grit in the eyes.
Asteraceae -- Sunflower Family
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