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Machaeranthera gracilis (Slender goldenweed)
Anderson, Wynn

Machaeranthera gracilis

Machaeranthera gracilis (Nutt.) Shinners

Slender Goldenweed, Grass-leaf Tansy-aster, Yellow Spiny Daisy

Asteraceae (Aster Family)

Synonym(s): Dieteria gracilis, Haplopappus gracilis, Haplopappus ravenii, Sideranthus gracilis

USDA Symbol: MAGR10

USDA Native Status: L48 (N)

This flower makes up in numbers what it lacks in size. Sometimes it covers large areas, 1 or 2 acres, with its bright yellow flowers. It grows 10-15 inches tall, with many narrow leaves, 1/8-1/4 inch long, the lower ones shallowly toothed. The stiff branches, 1-3 inches long, are on the upper half of the main stem, with 1 flower head at the end of each. Each flower head, 1/2-3/4 inch across, has 20-30 ray flowers and many disc flowers.

This species has also been found to have the lowest chromosome number of any plant investigated so far, with only four chromosomes in each cell; most plants have 14-30.


From the Image Gallery

33 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Annual
Habit: Herb
Size Notes: Grows 1015 inches tall.
Size Class: 0-1 ft. , 1-3 ft.

Bloom Information

Bloom Color: Yellow
Bloom Time: Aug , Sep , Oct , Nov


USA: AZ , CA , CO , ME , NM , NV , NY , TX , UT


Bibref 248 - Texas Wildflowers: A Field Guide (1984) Loughmiller, C. & L. Loughmiller

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Additional resources

USDA: Find Machaeranthera gracilis in USDA Plants
FNA: Find Machaeranthera gracilis in the Flora of North America (if available)
Google: Search Google for Machaeranthera gracilis


Record Modified: 2021-03-12
Research By: TWC Staff

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