Xanthisma species

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Scientific Name Xanthisma spinulosum var. chihuahuanum (Machaeranthera pinnatifida var. chihuahuana) USDA PLANTS Symbol
Common Name Chihuahua Tansyaster ITIS Taxonomic Serial No.
Family Asteraceae (Sunflower) efloras.org Reference
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Description Habitat: Sandy or rocky washes, desert environment.
Plant: Erect perennial 12 to 20 inches tall; multiple tangled stems from woody base.
Leaves: Spaced out along stem, 1 to 3 inches long, deeply pinnately-lobed edges with spines at lobe tips.
Inflorescence: Compound yellow flowers about 1 inch or less across; 14 to 60 ray flowers (petals) and many yellow disk florets.
Reference: www.americansouthwest.net and www.efloras.org.
Notes: Xanthisma spinulosum is a highly variable species with several variants, X. chihuahuanum being found in the Chihuahua desert (including portions of Big Bend).
Texas Status
Scientific Name Xanthisma texanum var. drummondii USDA PLANTS Symbol
Common Name Drummond's Sleepy-daisy ITIS Taxonomic Serial No.
Family Asteraceae (Sunflower) Wildflower Center Ref.
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Description Habitat: Dry, open and sandy areas in prairies, meadows, pastures. Found mainly in the Llano area.
Plant: Erect annual, 1 to 3 feet tall, branching in the upper half.
Leaves: Upper leaves lanceolate, alternate, somewhat glossy leaves 1/2 to 2 inches long and stalkless; lower leaves wider and deeply pinnately-lobed.
Inflorence: Compound yellow flowers 3/4 to 1-1/2 inch across; 18 to 22 ray flowers (petals) with pointed tips and many yellow disk florets.
Reference: Descr. excerpt from "Wildflowers of the Texas Hill Country" by Marshall Enquist and www.wildflower.org.
Notes: X. texanum closes at night and cloudy days, hence its common name.
Texas Status

© Tom Lebsack 2018