San Felipe Dogweed
Foetid Marigold
Adenophyllum porophylloides
(Dyssodia porophylloides)
Sketched from live specimen observed at South Mountain Park, Phoenix, Maricopa Co., Arizona. An enlarged view of an achene with crown of fine bristles is at top center.
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FLOWERS: Heads are taller than wide and have orange-yellow ray and disc flowers. The ray flowers are sometimes obscure or absent. The phyllaries bear conspicuous glands - the source of the strong odor. Blooms can be found through much of year (moisture permitting) but flowering peaks Apr. and May.
Inflorescence (a group of smaller flowers, or 'florets') of Foetid Marigold observed at South Mountain Park, Phoenix, Arizona on 31 May 2010.
PERENNIAL HERB: Woody at crown and just a bit above the soil line.
Mostly well under a meter tall.
LEAVES: Dissected leaves usually have three to five toothed, linear
segments. Leaves and flowers emit very pungent terpenes when
crushed.
FRUIT: A slender, dark
achene topped with a crown of scales and course bristles.
RANGE: A common plant in the Sonoran Desert found on wash banks and
rocky slopes. Also found in the Mojave Desert.
UNARMED: Plant is without thorns.