SafePlants

Mojave Milkweed (Asclepias nyctaginifolia)

Asclepias nyctaginifolia, commonly known as Mojave milkweed, is a fascinating plant species found in the southwestern United States. This perennial herb plays a vital role in the ecosystem, particularly as a host plant for monarch butterflies.

Considerations for Pets

• Milkweed plants, in general, contain sap.

Scientific Classification and Nomenclature

• Scientific Name: Asclepias nyctaginifolia A. Gray
• Common Name: Mojave milkweed
• Family: Apocynaceae (formerly Asclepiadaceae)
• Group: Dicot
• Synonyms: None explicitly stated, but be aware that older resources might classify it under Asclepiadaceae.

Distribution and Habitat

• Native to the southwestern United States, including California, Arizona, and the Mojave Desert.
• Specifically mentioned locations include eastern San Bernardino County in California, Arizona's Sonoran Desert, and Yavapai County.
• It is found in both high and low desert environments.
• It is considered a rare plant in some areas, with limited occurrences.

Morphological Characteristics

• Growth Habit: Perennial forb/herb (non-woody plant).
• Stems: Erect to spreading, sparingly branched from near the base.
• Height: Typically 10-40 cm tall, but can reach up to 60 cm.
• Leaves: Large, lance-shaped to elongated oval leaves.
• Flowers: Pale green and white flowers in a cluster (umbel).

Ecological Role

• Monarch Butterfly Host: Mojave milkweed is crucial for the life cycle of the monarch butterfly. Female monarchs lay their eggs on milkweed plants, and the caterpillars feed exclusively on milkweed leaves.
• Conservation Concerns: Due to habitat loss and other factors (such as development projects), Mojave milkweed populations can be threatened, impacting monarch butterfly populations as well as other desert species that rely on the plant.

Quirky Facts

• Mojave milkweed is listed as a CNPS (California Native Plant Society) list 2B.1, suggesting its rarity and conservation concern in California.