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Machaeranthera pinnatifida
Machaeranthera pinnatifida (Hook.) Shinners
Lacy Tansyaster, Yellow Spiny Daisy
Asteraceae (Aster Family)
Synonym(s): Xanthisma spinulosum
USDA Symbol: MAPI
USDA Native Status: L48 (N), CAN (N)
A slender plant with small, weakly bristly leaves and 1 yellow flower head at tip of each of many upper branches.
The classification of this species, once known as Haplopappus spinulosus, has perplexed botanists; Haplopappus in the strictest sense is a southern South American genus. North American plants related to Yellow Spiny Daisy may be better placed in Machaeranthera. The very similar but annual species M. gracilis, also called Yellow Spiny Daisy, has the lowest chromosome number known in plants, with only four chromosomes in each cell; most plants have 14-30.
Plant Characteristics
Duration: PerennialHabit: Subshrub
Size Notes: Up to about 3 feet tall.
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.
Bloom Information
Bloom Color: YellowBloom Time: Mar , Apr , May , Jun , Jul , Aug , Sep , Oct , Nov
Distribution
USA: AR , AZ , CA , CO , IA , ID , KS , MN , MT , ND , NE , NM , NV , OK , SD , TX , UT , WYCanada: AB , MB , SK
Native Distribution: Alberta south through Rocky Mountain region and much of the Plains states to New Mexico, Arizona, southern California, and northern Mexico.
Native Habitat: Open places in arid grasslands and deserts and among piņon and juniper.
National Wetland Indicator Status
Region: | AGCP | AK | AW | CB | EMP | GP | HI | MW | NCNE | WMVE |
Status: | FACU | UPL | UPL | FACU | FACU |
From the National Organizations Directory
According to the species list provided by Affiliate Organizations, this plant is on display at the following locations:Sibley Nature Center - Midland, TX
Web Reference
Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.Additional resources
USDA: Find Machaeranthera pinnatifida in USDA PlantsFNA: Find Machaeranthera pinnatifida in the Flora of North America (if available)
Google: Search Google for Machaeranthera pinnatifida
Metadata
Record Modified: 2022-12-29Research By: TWC Staff