Yellow Star-Thistle

centaurea solstitialis

Yellow Star-Thistle (Centaurea solstitialis) is a highly invasive annual or biennial plant originating from Eurasia, now widespread across many parts of the world, particularly North America. Recognized for its striking yellow flowers and formidable spines, it poses significant ecological and economic threats, especially in rangelands and agricultural areas. This resilient species forms dense, impenetrable stands, outcompeting native vegetation, reducing biodiversity, and diminishing forage quality for livestock. Its remarkable adaptability and prolific seed production contribute to its success as a colonizer of disturbed habitats. Understanding and managing Yellow Star-Thistle is crucial for maintaining healthy ecosystems and productive landscapes.

生息地: Yellow Star-Thistle thrives in disturbed areas such as pastures, rangelands, roadsides, clearcuts, cultivated fields, and open grasslands, preferring well-drained soils and full sun.

外見

Yellow Star-Thistle typically grows 30 to 150 cm tall, featuring a stiff, ridged stem that is often branched, giving the plant a bushy appearance. The leaves are grayish-green; basal leaves are deeply lobed, while stem leaves are narrow and unlobed. Its most distinctive feature is the bright yellow, thistle-like flower heads, which are borne singly at the tips of branches. Each flower head is surrounded by sharp, straw-colored spines, up to 2 cm long, emanating from the bracts (modified leaves) beneath the flowers, making it prickly to the touch.

界Plantae門Tracheophyta綱Magnoliopsida目Asterales科Asteraceae属Centaurea

Yellow Star-Thistle

カテゴリ

植物

レア度

Common

危険度

1/5 · 非常に低い

スナップ

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おもしろい事実

Despite its formidable spines, the young rosettes of Yellow Star-Thistle are edible and were historically consumed by some cultures before flowering.

It is a highly competitive plant, capable of forming monocultures that can cover hundreds of acres, severely impacting rangeland productivity and native plant populations.

The plant contains a compound called repin, which can cause 'chewing disease' (nigropallidal encephalomalacia) in horses, a neurological condition affecting their ability to chew and swallow.

Yellow Star-Thistle seeds are dispersed by various means, including wind, water, animals, and human activities like contaminated hay or vehicle transport.

特殊能力

This plant develops a robust, deep taproot that can extend several meters into the soil. This allows it to access water and nutrients unavailable to many shallower-rooted native plants, conferring a significant competitive advantage, especially during dry periods.

Yellow Star-Thistle releases allelopathic chemicals into the soil. These compounds inhibit the germination and growth of neighboring plant species, effectively reducing competition and facilitating its dominance in invaded areas.

A single plant can produce tens of thousands of seeds, ensuring widespread dispersal and establishment. These seeds have varying dormancy periods, allowing them to remain viable in the soil seed bank for several years, leading to persistent infestations.

サイズと詳細

長さ: 30-150 cm
体重: 0.1-1.5 kg
寿命: 1-2 年
一度の産卵数: 10000-100000

食性と食事

As a photosynthetic plant, Yellow Star-Thistle produces its own food by converting light energy into chemical energy. It absorbs water and essential mineral nutrients from the soil through its roots and carbon dioxide from the atmosphere through its leaves.

主な食物

Sunlight
Carbon Dioxide
Water
Nitrogen Compounds
Phosphorus Compounds

採餌方法

Photosynthesis And Nutrient Absorption

生態系とのつながり

herbivore

Yellow Star-Thistle Hairy Weevil

Eustenopus villosus

A biological control agent that lays eggs in the flower heads; larvae feed on developing seeds, reducing seed production.

competitor

Purple Needlegrass

Nassella pulchra

Displaced by dense stands of Yellow Star-Thistle, leading to reduced biodiversity and forage availability.

herbivore

Domestic Sheep

Ovis aries

Can graze on young Yellow Star-Thistle plants, but avoid mature, spiny plants, making it a less effective control method.

herbivore

Thistle Lace Bug

Tingis ampliata

Can be a host to various insect species, though it is primarily known for its negative interactions due to its invasiveness.

特徴

このオブジェクトにはまだ特徴バッジが割り当てられていません。

別名

まだ別名はありません。

コレクション

テーマが追加されると、このオブジェクトのコレクションがここに表示されます。

安全性

危険度

1/5 · 非常に低い

まだ特別な安全上の注意はありません。

よくある質問

Yellow Star-Thistleを見分けるには？

Yellow Star-Thistleを識別する最も簡単な方法は、Snappit自然識別アプリを使用することです。

Yellow Star-Thistleの長さは何ですか？

30-150 cm

Yellow Star-Thistleの体重は何ですか？

0.1-1.5 kg

Yellow Star-Thistleの寿命は何ですか？

1-2 年

Yellow Star-Thistleは何を食べますか？

Yellow Star-Thistleは通常どこに生息していますか？

Yellow Star-Thistle thrives in disturbed areas such as pastures, rangelands, roadsides, clearcuts, cultivated fields, and open grasslands, preferring well-drained soils and full sun.

Yellow Star-Thistleはどのように狩りをしますか？

Photosynthesis And Nutrient Absorption

Yellow Star-Thistleの一度の産卵数は何ですか？

10000-100000