San Joaquin Milkvetch
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San Joaquin Milkvetch
astragalus asymmetricus
The San Joaquin Milkvetch is an eye-catching, robust perennial herb native exclusively to California's Central Valley and the surrounding foothills. Belonging to the diverse Fabaceae (pea) family, this plant is known for its tall, leafy, erect stems and striking clusters of cream-colored flowers. It plays a unique role in its dry, grassy ecosystems, adapted to thrive under the intense summer heat of California's interior valley. While it looks delicate, it is a tough survivor with a chemically complex makeup. Historically, members of the Astragalus genus are notorious for their chemical defenses, earning some species the name 'locoweed' due to their toxic effects on grazing livestock. For nature enthusiasts exploring California's oak woodlands and open grasslands, spotting this endemic milkvetch is a treat, especially when its highly unusual, asymmetric seed pods swing in the breeze.
Hábitat: Typically found in the dry grasslands, oak woodlands, and open scrublands of California's Central Valley and Coast Ranges, often thriving in clay or sandy-loam soils.
Aspecto
This erect perennial herb stands between 50 to 120 centimeters tall, supported by thick, hollow, pale green stems covered in fine, clean hairs. Its leaves are divided into numerous small, oval leaflets arranged in pairs along a central stalk. During spring, it produces dense, showy clusters of tubular, cream-colored to pale yellow pea-like flowers. The most distinguishing feature of this plant is its seed pods: they are heavily inflated, hanging downwards on long, thin stalks, and noticeably lopsided or asymmetric in shape.
ReinoPlantaeFiloTracheophytaClaseMagnoliopsidaOrdenFabalesFamiliaFabaceaeGéneroAstragalus
Categoría
PlantasRareza
Common
Peligro
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Datos interesantes
Like several other Astragalus species, it is classified as a 'locoweed' because it contains swainsonine, an alkaloid toxic to the nervous systems of horses and cattle.
The papery, inflated seed pods act like tiny balloons, allowing them to float on water or roll along the ground in high winds to spread their seeds.
The species name 'asymmetricus' directly references the plant's highly unusual, lopsided seed pods that hang unevenly from their stalks.
Habilidades especiales
Habilidad
Selenium Accumulation
It can absorb and concentrate high levels of selenium from the soil, making its tissues toxic to herbivores and deterring grazing.
Habilidad
Nitrogen Fixation
Hosts symbiotic Rhizobium bacteria in its root nodules to convert atmospheric nitrogen into usable nutrients, enriching poor soils.
Habilidad
Asymmetric Wind Dispersal
Produces highly inflated, lightweight, asymmetric seed pods that act as sails, catching the wind easily to disperse seeds away from the parent plant.
Medidas y detalles
- Longitud
- 50-120 cm
- Esperanza de vida
- 3-10 años
Dieta y alimentación
As an autotrophic plant, the San Joaquin Milkvetch produces its own energy via photosynthesis, converting sunlight, water, and carbon dioxide into sugars.
Alimentos principales
- Sunlight
- Water
- Carbon dioxide
- Soil nutrients
Conexiones ecológicas
mutualism
Yellow-faced Bumble Bee
Bombus vosnesenskii
Provides nectar and pollen, relying on this native bee species for pollination.
eaten by
Domestic Cattle
Bos taurus
Occasionally grazes the foliage, which can lead to severe toxic neurological symptoms known as locoweed poisoning.
mutualism
Western Honey Bee
Apis mellifera
Visits the creamy blossoms during spring to forage for nectar and assist in pollination.
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 San Joaquin Milkvetch?
La forma más fácil de identificar a San Joaquin Milkvetch es usar la aplicación de identificación de naturaleza Snappit.
¿Cuál es el longitud de San Joaquin Milkvetch?
50-120 cm
¿Cuál es el esperanza de vida de San Joaquin Milkvetch?
3-10 años
¿Qué come San Joaquin Milkvetch?
As an autotrophic plant, the San Joaquin Milkvetch produces its own energy via photosynthesis, converting sunlight, water, and carbon dioxide into sugars.
¿Dónde se encuentra normalmente San Joaquin Milkvetch?
Typically found in the dry grasslands, oak woodlands, and open scrublands of California's Central Valley and Coast Ranges, often thriving in clay or sandy-loam soils.
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