Parthenium species

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Scientific Name Parthenium confertum USDA PLANTS Symbol
PACO11
Common Name Lyreleaf Parthenium, Gray's Feverfew ITIS Taxonomic Serial No.
38163
Family Asteraceae (Sunflower) SEINet Reference
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Description Habitat: Sandy soils, open areas.
Plant: Biennial 4 to 12 inches tall.
Leaves: Leave shape ovate overall, 1-1/2 to 3 inches long, pinnately-lobed, with erect hairs and dotted with glands .
Inflorescence: Terminal cluster of composite white flower heads, each 3/16-inch across, with 5 ray florets surrounding 20 to 30 or more disk florets.
Bloom Period: March to October.
References: SEINet.
Texas Status
Native
Scientific Name Parthenium hysterophorus USDA PLANTS Symbol
PAHY
Common Name False Ragweed, Santa Maria Feverfew ITIS Taxonomic Serial No.
38164
Family Asteraceae (Sunflower) SEINet Reference
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Description Habitat: Various soils and habitats, disturbed areas; widespread.
Plant: Erect stout annual or biennial 12 to 40 inches tall, stem grooved and branching in upper portion.
Leaves: Deeply-lobed leaves,pinnately-divided, 4 to 8 inches long overall.
Inflorescence: Terminal cluster of composite white flower heads, each 3/16-inch across, with 5 ray florets surrounding many disk florets.
Bloom Period: March to November.
References: "Wildflowers of Texas" by Geyata Ajilvsgi and SEINet.
Texas Status
Introduced

© Tom Lebsack 2018