Yerba Porosa
Porophyllum ruderale
In partial shade among riparian trees at Sycamore Canyon, Sta. Cruz Co., Arizona, USA. 25 Sept. 2016.
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LEAVES: The leaves are ovate with wavy margins.
The crushed foliage emits a powerful odor like its desert relative, Odora.
RANGE: In Arizona this plant is restricted to moist areas in lower canyons of southeastern Arizona. Found in similar habitats along the border from Texas to
California.
ANNUAL or PERENNIAL: Above ground portions are entirely herbaceous without woody stems - rarely more than 70 cm tall.
FLOWERS: There are no ray florets and the disc florets are mostly concealed by the phyllaries. At blooming the purple-tinged tips may show.
FRUIT: The heads hold a dozen or more seeds topped with tan-colored bristles.
UNARMED