Bigelow's Beggarticks
Bidens bigelovii
Observed along Sycamore Wash in the Patagonia Mountains, Sta. Cruz Co., Arizona, USA. 29 Aug. 2015.
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LEAVES: The leaves are pinnately divided into narrow segments.
FLOWERS: This plant is a composite so the flowers are grouped together into a compact head.
Disc flowers are yellow and number a dozen or less. Ray flowers are short and white and may number less than five.
ANNUAL: Seeds germinate in summer depending on arrival of rains; one or a few branching stems reach a maximum
of 1.5 meters
tall.
RANGE: This plant in Arizona requires mostly well-watered soil in the canyon bottoms.
FRUIT: Each of the florets in the head gives rise to a nearly black seed with two barbed awns. These serve
to disperse the seeds by catching hold of fur or clothing.
UNARMED