guayule Asteraceae Parthenium argentatum A. Gray Listen to the Latin symbol: PAAR5 Other Fact Sheets
Leaf: Alternate, simple, evergreen, lanceolate to ovate, 1 to 3 inches long, entire or with a few scatterd teeth or shallow lobes, gray-green with abundant silvery hairs above and below.
Flower: Small, pale yellow to white flower which occurs in dense flat topped, many branched, terminal clusters, appearing nearly year round whenever just a small amount of rain occurs.
Fruit: A small achene in tight, terminal clusters.
Twig: Slender gray-green, covered with silvery hairs.
Bark: Light gray-brown with shallow fissures and darker ridges.
Form: A shrub with a rounded, dense crown reaching up to 3 feet in height.
leaf fruit bark form1 map
Additional Range Information:
Parthenium argentatum is native to North America.
Range may be expanded by planting.
See states reporting guayule.
External Links:
USDA Plants Database
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Photos and text by: John Seiler,
Edward Jensen, Alex Niemiera,
and John Peterson
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