Parthenium argentatum A. Gray
Guayule, Rubber Plant
Asteraceae (Aster Family)
USDA Symbol: PAAR5
Shrub 1 to 3 feet in height and spread. Leaves lanceolate to oblanceolate; length and width variable, but average about 1 inch by 1/2 inch; margins mostly entire, sometimes with a few sharp teeth; surfaces gray or white strigillose, sometimes dotted with glands. Capitula radiate in small clusters on ebracteate pedicels; each capitulum bears 5 fertile ray florets and 20 to 30 disc florets. Native to the Chihuahuan Desert in Texas and Mexico. Habitat on rocky, calcareous soils.
This species is a source for latex used in the manufacture of high-quality rubber.
From the Image Gallery
Plant CharacteristicsDuration: Perennial
Leaf Shape: Lanceolate , Oblanceolate
Leaf Pubescence: Glandular , Hirsute
Leaf Margin: Entire
Size Notes: 1 to 3 feet in height.
Fruit: Fruit a cypsela.
Bloom InformationBloom Color: White , Yellow , Green
Bloom Time: Apr , May , Jun
Bloom Notes: Flowers white with a greenish-yellow cast.
Native Habitat: Rocky, calcareous soils in the Chihuahuan Desert.
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
NPSOT - Austin Chapter - Austin, TX
BibliographyBibref 995 - Native Landscaping from El Paso to L.A. (2000) Wasowski, S. and A. Wasowski
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Additional resourcesUSDA: Find Parthenium argentatum in USDA Plants
FNA: Find Parthenium argentatum in the Flora of North America (if available)
Google: Search Google for Parthenium argentatum
MetadataRecord Modified: 2020-06-07
Research By: TWC Staff