Horseweed
| Plant Profile | |
|---|---|
| FYUSE 3D Image |
Common Name: Horseweed Other Names: Mare's Tail, Canadian Horseweed Species Name: Conyza canadensis Plant Type: Broadleafs, Herbaceous Family Name: Asteraceae, Sunflower Family |
Examples of HorseweedConyza canadensis
| Plant Facts | |
|---|---|
| Origin | Native |
| Duration | Annual |
| Season | Warm |
| Distribution in the U.S. | Across the U.S. |
| Distribution in Oklahoma | Throughout the state |
ID Characteristics
- Field Identification Characteristics
- Flowers: White to pinkish ray florets (2-3 millimeters long), equaling or exceeding the pappus; small flower heads terminating on each branch
- Inflorescence: Panicle of heads, terminal; involucre with 1-2 series of bracts (3-4 millimeters tall); bracts imbricate, greenish; ray florets numerous, disk florets 20-50
- Leaves: Numerous long, narrow leaves
- Stem can appear to have ridges; hairs on stems and leaf margins
- Tall erect stems branched only at the top
- Leaf and Stem Characteristics
- Leaf Type: Simple
- Leaf Arrangement: Alternate
- Leaf Shape: Linear to oblancelolate (3-10 centimeters long, 2-10 centimeters wide), numerous, crowded on the stem, reduced upwards, margins entire to teeth few; surfaces coarsely hirsute to without hair; sessile to short-petioled; basal blades deciduous
- Stems: Erect, simple, unbranched below, branching at inflorescence, surfaces coarsely hirsute
- Stipules: Absent
- Floral Characteristics
- Flower Timing: June-September
- Petal Number: 25-40
- Fruit Type: Achenes obovate to oblanceolate (1-1.5 millimeters long), straw-colored, flattened; pappus of tan to white bristles seed
| Habitat/Ecology | |
|---|---|
| Soil Type | Grows in all soil conditions; best growth on fertile, loamy soil |
| Habitat | Throughout the great plains on rangeland, open cultivated fields, gardens, feedlots, rights-of-way, clearcuts, waste areas and recently disturbed open areas |
| Successional Stage | Early |
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