Notch-Leaf Scorpionweed

phacelia crenulata

The Notch-Leaf Scorpionweed (Phacelia crenulata) is a striking annual wildflower native to the arid desert regions of the southwestern United States and northern Mexico. It is renowned for its vibrant, violet-blue, bell-shaped blossoms clustered in coils that resemble a scorpion's tail, which gives the plant its descriptive common name. While beautiful to behold in the spring when desert superblooms paint the landscape, this plant carries a potent secret: its foliage is coated in glandular hairs that secrete irritating oils, capable of causing a severe, itchy skin rash similar to poison ivy for unsuspecting hikers and botanists. Despite this fierce defense, it serves as a critical early-season resource for desert pollinators, offering vital nectar when few other plants are in bloom. To easily track and identify Notch-Leaf Scorpionweed on your next adventure, download the Snappit app.

Habitat: Found in dry, sandy, gravelly, or rocky soils of desert flats, washes, and slopes, typically within the Mojave, Sonoran, and Great Basin deserts.

Appearance

This annual herb typically grows upright from 10 to 80 centimeters tall. It features dark green, deeply lobed or notched leaves with wavy margins that are covered in sticky, glandular hairs. The most distinctive feature is its terminal coiled flower stalks that unfurl as the blossoms open. The flowers themselves are bell-shaped, measuring about 6 to 10 millimeters across, with deep violet-purple to blue petals and prominent, long-exserted stamens that extend far beyond the corolla, giving the flower cluster a delicate, fuzzy appearance.

KingdomPlantaePhylumTracheophytaClassMagnoliopsidaOrderBoraginalesFamilyBoraginaceaeGenusPhacelia

Notch-Leaf Scorpionweed

Interesting facts

Despite being toxic or highly irritating to most mammals, it is a crucial early spring food source for specialized desert bees.

The common name 'Scorpionweed' refers to the tightly coiled flower clusters which strongly resemble the curved tail of a scorpion.

Touching the plant can cause a severe rash (allergic contact dermatitis) indistinguishable from poison ivy, caused by glandular secretions.

Special abilities

Coiled flower spikes slowly unfurl to ensure sequential blooming, maximizing pollination success over an extended period in unpredictable desert conditions.

Glandular trichomes secrete geranylhydroquinone, a sticky oil that causes painful contact dermatitis to deter grazing mammalian herbivores.

Seeds have a long-lived viability that allows them to remain dormant in desert soils for years, germinating only when winter rainfall thresholds are met.