Carnegiea gigantea, Giant Saguaro

Southwest Desert Flora

Home to the plants of the Sonoran, Chihuahuan and Mojave Deserts

Cirsium ochrocentrum, Yellowspine Thistle

Phacelia tanacetifolia, Lacy Phacelia

Scientific Name: Phacelia tanacetifolia
Common Name: Lacy Phacelia
Also Called: Lacy Scorpion-weed, Facelia and Fiddleneck
Family: Hydrophyllaceae (Boraginaceae, Hydrophylloideae), the Waterleaf Family
Synonyms: (Phacelia tanacetifolia Benth. subvar. tenuisecta)
Status: Introduced from California.
Duration: Annual
Size: Up to 3 feet or more usually much less.
Growth Form: Forb/herb; stems erect stiff-hairy (hispid)
Leaves: Green; mostly compound, leaflets lobed (see photo above), stiff-hairs, .
Flower Color: Blue, lavender-blue; bell-shaped, sessile in scorpioid cyme, fruit a capsule.
Flowering Season: March to May.
Elevation: Up to 5,000 feet.
Habitat Preferences: In California sandy or gravelly slopes and open areas.
Recorded Range: An irregular distribution in the United States where Lacy Phacelia is found in; AZ, CA, KS, MA, ME, MI, NV and OR. Native to California and possibly Arizona. Also native to the eastern 23 of Canada; Baja California and possibly northern Mexico.

U.S. Weed Information: No information available.
Invasive/Noxious Weed Information: No information available.
Wetland Indicator: No information available.
Threatened/Endangered Information: No information available.

Genus Information: Over 150 species in Phacelia in the United States and all of North America and northern Mexico. An additional 20 or so species are native to South America. The genus Phacelia collectively are commonly referred to as; Phacelia, Scorpionweed, Heliotrope.

The Plant List includes 368 scientific plant names of species rank for the genus Phacelia. Of these 186 are accepted species names.


In Southwest Desert Flora also see Desert Bluebells, Phacelia campanularia; Cleftleaf Wildheliotrope, Phacelia crenulata; Distant Phacelia, Phacelia distans; Varileaf Phacelia, Phacelia heterophylla and Kaweah River Scorpion-weed, Phacelia magellanica.

Date Profile Completed: 10/07/2105
U.S. Dept. of Agriculture, Natural Resources Conservation Service on-line database and USGS ITIS search
The Plant List (2013). Version 1.1. Published on the Internet; (accessed 10/03/2015).
Native Plant Information Network, NPIN (2013). Published on the Internet [accessed: 10/06/2105]. Lady Bird Johnson Wildflower Center at The University of Texas, Austin, TX.
1993, The Jepson Manual, Citation: (accessed 10/06/2105),4587,4703
SEINet for synonyms, scientific names, recorded geographic locations and general information