Thread - Leaf Groundsel. Senicio flaccidus var. douglasii, Aster Family: ( Asteraceae ), Thread - Leaf Groundsel. Also called: Creek Senecio, Shrubby Butterweed, or Smooth Threadleaf Ragwort. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. These plants are dicots of the Asteraceae family growing as a subshrub - shrub. This plant is considered Native to the United States of America.. Bushy perennial, 3 feet tall or more, 2 1/2 feet spread; glabrous leaves, 1 to 4 inches long, with 5 to 9 needle-like lobes. Threadleaf groundsel is a many-stemmed evergreen composite. The stems and leaves are gray-green. The leaves are divided into three to seven segments and may be hairy or nearly smooth. The stems are herbaceous, although somewhat woody at the base, and may have variable hairiness. Showy yellow flowers emerge from March through November. Threadleaf groundsel is a common range plant in Colorado and Utah, and south to Texas and Mexico. It is common in the grassland areas of western Texas. Disturbance and overgrazing cause it to increase in abundance. Hummingbirds, bees, butterflies and other insects collect nectar from the flowers. Seed eaters eat the seeds. Quick Notes: Height: Growing about 18 to 48 inches tall. Flowers: Flowerheads 3 - 4 inches across; yellow ray florets and purplish brown disk florets. Eight - Thirteen Rays. The ray florets are sterile, and only the disk florets produce seeds. Flowering Time: March - May, then again in the fall months of August - October. Leaves: The leaves are pinnate with narrow, thread-like lobes. Found: Native throughout Southwestern USA, and northwestern Mexico, up to about 6,500 feet elevation. Hardiness: USDA Zone 3a: to -39.9 �C (-40 �F) USDA Zone 3b: to -37.2 �C (-35 �F) USDA Zone 4a: to -34.4 �C (-30 �F) USDA Zone 4b: to -31.6 �C (-25 �F) USDA Zone 5a: to -28.8 �C (-20 �F) USDA Zone 5b: to -26.1 �C (-15 �F) USDA Zone 6a: to -23.3 �C (-10 �F) USDA Zone 6b: to -20.5 �C (-5 �F) USDA Zone 7a: to -17.7 �C (0 �F) USDA Zone 7b: to -14.9 �C (5 �F) USDA Zone 8a: to -12.2 �C (10 �F) USDA Zone 8b: to -9.4 �C (15 �F) USDA Zone 9a: to -6.6 �C (20 �F) USDA Zone 9b: to -3.8 �C (25 �F) USDA Zone 10a: to -1.1 �C (30 �F) USDA Zone 10b: to 1.7 �C (35 �F) Soil pH requirements: 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline) 7.9 to 8.5 (alkaline) 8.6 to 9.0 (strongly alkaline) Sun Exposure: Full Sun Elevation: 1,800 - 6,500 Feet. Habitat: Alkaline, well-drained/light soils. Dry slopes, stream beds, roadsides, and washes. overgrazed rangelands, dried up stream beds and desert grasslands. Miscellaneous: Flowering Photos Taken September 23, 2006. Cherry Road, Arizona.

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