Purple Star-Thistle
探検植物
Purple Star-Thistle
centaurea calcitrapa
The Purple Star-Thistle (Centaurea calcitrapa) is a hardy, branching biennial herb famous for its formidable defense mechanisms. Native to the Mediterranean basin, this member of the sunflower family (Asteraceae) has successfully spread to many temperate regions globally, often becoming an aggressive invasive weed. It plays a dual role in ecosystems: while it is notorious for invading agricultural lands, degrading pastures, and crowding out native flora, its flowers provide a vital source of nectar for bees and other pollinators during the late summer months. Its resilient nature allows it to thrive in nutrient-poor, dry, and heavily disturbed soils where other plants struggle. Its scientific name 'calcitrapa' perfectly captures its spiked physical nature, evoking the imagery of medieval spiked caltrops designed to deter cavalry.
生息地: Typically found in dry, disturbed areas such as overgrazed pastures, agricultural fields, waste lands, and sandy roadsides.
外見
This plant is easily identified by its highly branched, bushy growth form that can reach up to one meter in height. Its most distinctive features are the flower heads: small, pale purple to pinkish florets sitting atop a base heavily armored with stout, sharp, straw-colored spines measuring up to 2.5 centimeters in length. The lower leaves are deeply lobed and form a rosette close to the ground, while the upper leaves are smaller, narrow, and lack lobes, clinging tightly to the tough, ridged, and finely haired stems.
界Plantae門Tracheophyta綱Magnoliopsida目Asterales科Asteraceae属Centaurea
カテゴリ
植物レア度
Common
危険度
1/5 · 非常に低い
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おもしろい事実
Its spines are so formidable that they can injure grazing livestock, often forcing animals to avoid pastures entirely when infestations are heavy.
Purple Star-Thistle seeds have been known to contaminate commercial seed mixes and hay, helping it easily spread across continents.
The species name 'calcitrapa' comes from the Latin word for 'caltrop', a multi-pointed iron weapon used in medieval warfare to obstruct horses, referring to the plant's painfully sharp spines.
特殊能力
能力
Spiny Caltrop Armor
The flower heads are surrounded by incredibly sharp, rigid spines that deter grazing herbivores and protect the developing seeds.
能力
Deep Taproot System
A robust, deep taproot allows the plant to access moisture and nutrients deep in the soil, ensuring survival during hot, dry summer droughts.
能力
Prolific Seed Production
A single plant can produce thousands of seeds that can remain dormant and viable in the soil for several years, waiting for ideal growth conditions.
サイズと詳細
- 長さ
- 20-100 cm
- 寿命
- 1-2 年
食性と食事
As a photoautotrophic plant, it manufactures its own energy from sunlight, water, and carbon dioxide through photosynthesis.
主な食物
- Sunlight
- Water
- Carbon dioxide
- Soil nutrients
生態系とのつながり
eaten by
Knapweed peacock fly
Chaetorellia acrolophi
The larvae of this fly feed on the seeds inside the flower heads, making it a biological control agent.
mutualism
Western Honey Bee
Apis mellifera
Bees pollinate the purple flowers while foraging for abundant nectar and pollen.
competitor
Yellow Star-Thistle
Centaurea solstitialis
Competes aggressively with the purple star-thistle for space, water, and soil nutrients in dry pastures.
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
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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
Purple Star-Thistleを見分けるには？
Purple 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。
Purple Star-Thistleの長さは何ですか？
20-100 cm
Purple Star-Thistleの寿命は何ですか？
1-2 年
Purple Star-Thistleは何を食べますか？
As a photoautotrophic plant, it manufactures its own energy from sunlight, water, and carbon dioxide through photosynthesis.
Purple Star-Thistleは通常どこに生息していますか？
Typically found in dry, disturbed areas such as overgrazed pastures, agricultural fields, waste lands, and sandy roadsides.
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