Racemose Milkvetch
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Racemose Milkvetch
astragalus racemosus
Racemose Milkvetch (Astragalus racemosus) is a robust, perennial wildflower native to the open prairies and badlands of central and western North America. Belonging to the diverse Fabaceae family, this species is highly specialized to thrive in soils that many other plants find inhospitable. It is famously classified as a selenium hyperaccumulator, meaning it actively draws up large concentrations of selenium from the ground, storing it within its tissues. While this adaptation renders the plant highly toxic to grazing livestock, it serves as a critical defense mechanism against hungry herbivores in the wild. This fascinating survival strategy makes it a key subject of ecological study. Its dense, drooping clusters of creamy-white flowers provide crucial nectar for native bumblebees, demonstrating its complex role as both a localized hazard and an ecological partner.
Hábitat: Found on open prairies, plains, clay badlands, and roadsides, typically growing in heavy, clay-rich soils high in selenium or gypsum.
Aspecto
This upright perennial typically grows between 30 to 100 centimeters tall, forming leafy clumps with sturdy, sometimes reddish-purple stems. Its leaves are pinnately compound, divided into numerous narrow, oblong leaflets of a grayish-green hue. The most distinguishing feature is the dense, one-sided clusters (racemes) of tubular, pea-like flowers. These blossoms are creamy-white to pale yellow, measuring about 1.5 to 2 centimeters long, and they hang gracefully downward from long stalks. After flowering, the plant produces swollen, triangular seed pods that dry to a light brown color.
ReinoPlantaeFiloTracheophytaClaseMagnoliopsidaOrdenFabalesFamiliaFabaceaeGéneroAstragalus
Categoría
PlantasRareza
Common
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Datos interesantes
Because it only grows in soils rich in selenium, uranium prospectors historically used the presence of this plant to locate uranium-bearing geological formations.
It is highly toxic to horses and cattle, causing a chronic poisoning known as 'alkali disease' or 'blind staggers,' which leads to hair loss and hoof deformities.
When bruised or growing in hot weather, the plant releases a strong, garlic-like odor due to its high concentration of volatile selenium compounds.
Habilidades especiales
Habilidad
Selenium Hyperaccumulation
Actively absorbs and concentrates selenium from the soil, making its tissues toxic to herbivores and reducing competition from sensitive plants nearby.
Habilidad
Atmospheric Nitrogen Fixation
Partners with specialized underground rhizobia bacteria to convert atmospheric nitrogen into nutrients, enriching poor prairie soils.
Habilidad
Drought-Resistant Taproot
Employs a deep, robust woody taproot that anchors the plant and accesses deep water reserves in arid grasslands.
Medidas y detalles
- Longitud
- 30-100 cm
- Esperanza de vida
- 3-10 años
Dieta y alimentación
As a photosynthetic autotroph, it synthesizes its own sugars using sunlight, carbon dioxide, and water while absorbing essential minerals from the soil.
Alimentos principales
- Sunlight
- Carbon Dioxide
- Water
- Soil Minerals
Conexiones ecológicas
mutualism
Rhizobium bacteria
Rhizobium leguminosarum
Forms a mutualistic relationship in the root nodules to convert atmospheric nitrogen into usable ammonia.
mutualism
Hunt's Bumblebee
Bombus huntii
Feeds on the nectar of the flowers while acting as a primary pollinator.
eaten by
Astragalus Seed Beetle
Acanthoscelides aureolus
Larvae of this beetle feed directly on the developing seeds inside the woody pods.
Rasgos
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También conocido como
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Seguridad
Peligro
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Todavía no hay notas especiales de seguridad.
Preguntas frecuentes
¿Cómo identificar a Racemose Milkvetch?
La forma más fácil de identificar a Racemose Milkvetch es usar la aplicación de identificación de naturaleza Snappit.
¿Cuál es el longitud de Racemose Milkvetch?
30-100 cm
¿Cuál es el esperanza de vida de Racemose Milkvetch?
3-10 años
¿Qué come Racemose Milkvetch?
As a photosynthetic autotroph, it synthesizes its own sugars using sunlight, carbon dioxide, and water while absorbing essential minerals from the soil.
¿Dónde se encuentra normalmente Racemose Milkvetch?
Found on open prairies, plains, clay badlands, and roadsides, typically growing in heavy, clay-rich soils high in selenium or gypsum.
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