Prenanthella exigua
Brightwhite
(c) Jim Morefield, some rights reserved (CC BY), uploaded by Jim Morefield · licence
Family: Asteraceae · Type: Herb · Native
Prenanthella exigua (Brightwhite) is a native California herb in the Asteraceae family, recognized by Only Prenanthella species in CA, endemic to western North American deserts.
Brightwhite is a native annual herb found in the eastern Sierra Nevada desert and desert mountains in desert slopes, washes, and sagebrush to juniper woodland at elevations below 1,900 meters. Flowering from March to June, this delicate plant produces light pink or white flowers in slender, open panicle-like clusters with small, intricate branches. Growing 5 to 30 centimeters tall with a slender, openly much-branched stem that is sparsely glandular-puberulent, it has a distinctive milky sap. Its basal leaves are 1 to 3 centimeters long, spoon-shaped to oblanceolate, with edges that are entire to dentate or irregularly lobed, often featuring minutely spine-tipped teeth. The fruit is 2.5 to 3.5 millimeters long, cylindric with 5 ribs, and crowned by a white pappus of over 80 stiff, minutely barbed bristles.
Identification and appearance
Key characters: Only Prenanthella species in CA, endemic to western North American deserts
Habitat and range
Habitat: Desert slopes and washes to sagebrush/juniper woodland
Elevation: < 1900 m
Outside California: to Oregon, Colorado, western Texas, northern Mexico
Bloom period
Prenanthella exigua blooms Mar-Jun.
How to tell it apart
vs Pleiacanthus: Pleiacanthus has spiny stems and leaves; Prenanthella is completely unarmed.; vs Chondrilla: Chondrilla grows 10-150 cm tall with 6-60 flowers per head; Prenanthella is 5-30 cm with only 3-4 flowers.; vs Hieracium: Hieracium is densely long-hairy with 6-60 flowers per head; Prenanthella has 3-4 flowers and is less hairy.
Frequently asked questions
Is Prenanthella exigua native to California?
Yes. Prenanthella exigua is native to California (recorded as native).
When does Prenanthella exigua bloom?
Prenanthella exigua blooms Mar-Jun.
What plant family does Prenanthella exigua belong to?
Prenanthella exigua is in the Asteraceae family, genus Prenanthella.
What habitat does Prenanthella exigua grow in?
Prenanthella exigua grows in Desert slopes and washes to sagebrush/juniper woodland.
Related species
Other California species in the same genus, family, or bioregion.
Sources: Jepson eFlora · Index of California Plant Names · CalPhotos
Last updated 2026-10-07
Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, Cal-IPC, and more.