Parthenium species [Asteraceae]

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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 in open areas in desert scrub, canyon bottoms, and plains; below 6,000 ft.
Plant: Biennial 4 to 24 inches tall, one to a few stems branching above, with longitudinal striations and covered with long hairs.
Leaves: Blades ovate or rounded-deltate to elliptic in outline, 1 to 4-3/4 inches long and 3/4 to 1-1/2 inches wide, pinnately or sub-bipinnately 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.
BONAP Distribution Map

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.
BONAP Distribution Map

Texas Status:
Native
Scientific Name Parthenium incanum USDA PLANTS Symbol
PAIN2
Common Name Mariola ITIS Taxonomic Serial No.
38165
Family Asteraceae (Sunflower) SEINet
Reference
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Description Habitat: Desert scrub, gravelly slopes and plains, open areas, limestone soils, 2,500 to 5,000 ft.
Plant: Perennial shrub with gray-green foliage; low-growing, 12 to 40 inches tall; multiple branches from base, woody below.
Leaves: Leaf shape broadly ovate overall, 3/8 to 2-3/8 inches long and up to 3/4 inch wide, irregularly lobed or pinnatifid, on short petioles; very short hairs on both surfaces, especially dense on lower; surfaces dotted with glands.
Inflorescence: Terminal cluster of composite white flower heads, each 3/16-inch across, with 5 ray florets surrounding 8 to 20 or more disk florets.
Bloom Period: June to October.
References: ”Manual of the Vascular Plants of Texas" by Correll and Johnston and SEINet.
BONAP Distribution Map

Texas Status:
Native

© Tom Lebsack 2019