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Machaeranthera gracilis (Nutt.) Shinners
Slender goldenweed, Grass-Leaf Tansy-Aster, Yellow spiny daisy
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.
Plant CharacteristicsDuration: Annual Habit: Herb Size Notes:
Grows 10–15 inches tall. Fruit: Size Class:
0-1 ft. , 1-3 ft.
Bloom InformationBloom Color: Yellow
Bloom Time: Aug , Sep , Oct , Nov
Record Last Modified: 2013-08-30
Research By: TWC Staff