Isocoma pluriflora
Common Name(s):
Previously known as:
- Haplopappus heterophyllus
- Description
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Southern Jimmy Weed or Rayless Goldenrod is an erect, dense, herbaceous perennial shrub in the daisy family native to the America southwest. It is a flowering plant with a long season stretching from April to October. The plant is often found in salty, dry or rocky soil, sometimes over gypsum, and sandy or clay loam. This shrub is usually woody toward the base with erect, branching stems topped with numerous yellow flowers that form dense terminal cymes. The genus name is from Greek iso- for equal and coma, or hair of the head, referring to the flat-topped inflorences. The species name means many-flowered.
Southern Jimmy Weed can be a weed in roadsides near irrigated areas or in overgrazed pastures and is poisonous to livestock, causing "trembles", which can be passed through the milk to humans. The toxic compound is present in both green and dry material.
Diseases, Insect Pests, and Other Plant Problems:
No known diseases or insect pests. Toxic to livestock.
- See this plant in the following landscape:
- Cultivars / Varieties:
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- Tags:
- Cultivars / Varieties:
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- Tags:
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Attributes:
- Genus:
- Isocoma
- Species:
- pluriflora
- Family:
- Asteraceae
- Life Cycle:
- Perennial
- Country Or Region Of Origin:
- Southwestern United States and Mexico
- Distribution:
- Texas, Arizona, Colorado, New Mexico
- Dimensions:
- Height: 3 ft. 0 in. - 5 ft. 0 in.
- Width: 1 ft. 0 in. - 1 ft. 6 in.
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Whole Plant Traits:
- Plant Type:
- Perennial
- Shrub
- Habit/Form:
- Arching
- Dense
- Erect
- Maintenance:
- Low
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Cultural Conditions:
- Light:
- Full sun (6 or more hours of direct sunlight a day)
- Soil Texture:
- Clay
- Loam (Silt)
- Sand
- Shallow Rocky
- Soil Drainage:
- Moist
- USDA Plant Hardiness Zone:
- 4a, 4b, 5a, 5b, 6a, 6b
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Fruit:
- Fruit Description:
- The fruit is a cypsela, although it is often referred to as an achene.
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Flowers:
- Flower Color:
- Gold/Yellow
- Flower Inflorescence:
- Cyme
- Flower Value To Gardener:
- Long Bloom Season
- Flower Bloom Time:
- Fall
- Spring
- Summer
- Flower Shape:
- Radial
- Flower Size:
- < 1 inch
- Flower Description:
- Numerous flower heads of small blossoms form dense terminal cymes, straw colored with yellowish or greenish tips, 7-15 florets per flower head.
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Leaves:
- Leaf Color:
- Gray/Silver
- Green
- Leaf Type:
- Simple
- Leaf Arrangement:
- Alternate
- Leaf Shape:
- Linear
- Oblanceolate
- Leaf Margin:
- Dentate
- Entire
- Hairs Present:
- No
- Leaf Length:
- 1-3 inches
- Leaf Width:
- < 1 inch
- Leaf Description:
- Gray green leaves are simple, alternate along the stems, linear and sticky. The margins entire to sparsely short-dentate. Leaves are 3/4 of an inch to 1 1/2 inches long and 1/8 of an inch wide.
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Stem:
- Stem Is Aromatic:
- No
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Landscape:
- Problems:
- Problem for Horses
