Yellow in the Wood

lorilee

Sumner, United States

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Ragwort in the North Woods Park near my home in northeast Iowa.
Image taken “As Is” using my Canon PowerShot SX30 IS.

Tansy ragwort
Senecio jacobaea

Tansy ragwort is an invasive, toxic biennial weed from Europe most often found in pastures and along roads and trails.

An invader from Europe, tansy ragwort was first seen in seaports in the early 1900’s and is often spread in contaminated hay. When prevalent, tansy ragwort is one of the most common causes of poisoning in cattle and horses, caused by consumption of the weed found in pasture, hay or silage. Milk produced by affected cows and goats can contain toxins. Stock does not reject or avoid it in hay or silage; its poisonous alkaloids are unaffected by drying. Honey from tansy ragwort also contains the alkaloids.

Tansy RagwortThe plant’s stem is stout, erect or slightly spreading, and may be branched; often groups of stems arise from the plant crown. A biennial plant, tansy ragwort usually germinates in fall or early winter, lives through the next year as a rosette, then dies the following year after producing flowers and seeds. Its leaves are dark green on top, whitish-green underneath, and have deeply cut, blunt-toothed lobes with a ragged/ruffled appearance. Flower clusters develop on stout, leafy elongated stems that grow up to 6 feet tall; each flower cluster is composed of many bright-yellow flowers with (usually) 13 petals. Its seeds have a white pappus and are wind-carried, resulting in rapid spread of tansy ragwort infestations. A single large plant may produce 150,000 seeds, which may lie dormant in the soil for as long as 15 years. The plant’s fibrous system of coarse, light colored roots spreading from the crown can produce small adventitious shoots when stimulated by mechanical destruction or pulling.

Artwork Comments

  • barnsis
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