Coyotillo

(Karwinskia humboldtiana)

Coyotillo (Karwinskia humboldtiana)

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Estimated Native Range
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Summary

Karwinskia humboldtiana, commonly known as Coyotillo, is a deciduous shrub or small tree native to the chaparral, thorn scrub, and forest edges of southern Texas and much of Mexico. It typically grows to a height of 3-15 feet (1-5 meters) and a similar width, with a dense, rounded form. The plant produces inconspicuous greenish-white flowers followed by small, black, cherry-like fruits that are highly toxic. The fruits contain seeds that harbor toxins capable of inducing paralysis and potentially death in humans and livestock if ingested. Symptoms may take days or weeks to manifest after consumption.

Coyotillo is drought-tolerant and can thrive with minimal care, making it suitable for xeriscaping and naturalistic plantings in arid regions. It is also used in wildlife gardens where its dense foliage provides shelter for birds and small animals. However, due to its toxic nature, it should be planted with caution, especially in areas frequented by children or grazing animals. Coyotillo prefers full sun to part shade and is adaptable to various soil types, provided they have good drainage. It is rarely cultivated outside its native range due to its toxicity and is not known for any popular garden cultivars.CC BY-SA 4.0

Plant Description

  • Plant Type: Shrub
  • Height: 7-20 feet
  • Width: 6-13 feet
  • Growth Rate: Moderate
  • Flower Color: N/A
  • Flowering Season: Summer, Fall
  • Leaf Retention: Evergreen

Growth Requirements

  • Sun: Full Sun, Part Shade
  • Water: Low
  • Drainage: Fast, Medium

Common Uses

Natural Habitat

Native to chaparral, thorn scrub, and forest edges in southern Texas and much of Mexico

Other Names

Common Names: Tullidora , Cacachila , Coyotillo

Scientific Names: Karwinskia humboldtiana , Rhamnus humboldtiana , Karwinskia glandulosa , Karwinskia sessilifolia , Rhamnus biniflora , Karwinskia affinis , Karwinskia biniflora , Rhamnus maculata

GBIF Accepted Name: Karwinskia humboldtiana (Roem. & Schult.) Zucc.