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
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
Plant CharacteristicsDuration: Annual
Size Notes: Grows 10–15 inches tall.
Size Class: 0-1 ft. , 1-3 ft.
Bloom InformationBloom Color: Yellow
Bloom Time: Aug , Sep , Oct , Nov
BibliographyBibref 248 - Texas Wildflowers: A Field Guide (1984) Loughmiller, C. & L. Loughmiller
Search More Titles in Bibliography
Additional resourcesUSDA: Find Machaeranthera gracilis in USDA Plants
FNA: Find Machaeranthera gracilis in the Flora of North America (if available)
Google: Search Google for Machaeranthera gracilis
MetadataRecord Modified: 2015-02-06
Research By: TWC Staff