Skip to main content

Phacelia alba - white phacelia, white scorpion weed

Scientific Family
Hydrophyllaceae
Synonyms
Phacelia neomexicana var. alba
Plant type
Forbs and Subshrubs
Origin
Native
Lifecycle
Annual
Similar species
Phacelia denticulata, P. heterophylla
Height
To about 2-1/3 feet
Riparian
Yes
Hairy plant with upright to curved stems that are single or branched. Green leaves have narrow lobes and appear feather-like. Small bell-shaped flowers are crowded along 1 side of the blooming stalk causing the tip to curl over like a scorpion's tail.
Hairy and glandular throughout; stems usually stout, erect or curved upwards; leaves pinnately divided with narrow lobes; flowers white to pale bluish, in coiled elongated clusters, stamens and styles protrude; seeds excavated on one side, not ridged.

Habitat

Sandy, gravelly, loamy (sand, silt and clay mixture) soils, open brush and woodlands, meadows, roadsides, riparian areas; sagebrush, pinyon-juniper, ponderosa pine-Douglas fir and spruce-fir forests.
Plant Community
Riparian
Pinyon Juniper Woodlands
Montane Conifer Forest
Disturbed Areas
Low elevation
5500
High elevation
8500

Flower Characteristics

Flowers are 1/8 to 3/16 inch long, bell-like and grow in dense clusters along 1 side of the blooming stem so that the tips hook over like a coiled scorpion's tail. Stamens extend 3/4 to 1-1/2 inches beyond the petals on slender white thread-like stalks.
Flower color
White to pale bluish
Flower shape
Bell-shaped
Tubular
Yes
First bloom month
May
Last bloom month
August
Flower clusters
Elongated

Leaf and Stem Characteristics

Leaves are oval in outline with the blades growing 3/4 to 4 inches long and 3/4 to 3 inches wide. The blades have deeply divided narrow lobes with the leafstalks as long as or shorter than the blades. Leaf surfaces are hairy and often gland-dotted.
Leaf type
Simple
Leaf color
Green
Leaf shape
Round or oval
Leaf margin
Lobed
Leaf attachment
Basal & Alternate
Leaves clasp
No
Leaf hairs
Leaves & stems
Spines
No

Fruit and Seed Characteristics

The fruit is a dry, 2-sectioned capsule that splits lengthwise when mature to release the seeds.
Fruit type
Capsule
Fruit color
Yellowish-brown to brownish
Seeds may be few to many, are brown and about 1/8 inch long with honeycomb-like indentations (pitted) evenly spread across their surface.