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Vascular Plants of California
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Mentzelia dispersa

Higher Taxonomy
Family: LoasaceaeView DescriptionDichotomous Key
Habit: Annual to subshrub; hairs needle-like, barbed, occasionally stinging. Leaf: alternate [opposite], generally +- pinnate-lobed; stipules 0. Inflorescence: cyme, raceme. Flower: bisexual, radial; sepals generally 5, generally persistent; petals generally 5, free or fused to each other or filament tube; stamens 5--many, filaments thread-like to flat, occasionally fused at base or in clusters; petal-like staminodes occasionally present; pistil 1, ovary inferior, chamber generally 1, placentas generally 3, parietal, style 1. Fruit: capsule or achene. Seed: 1--many.
Genera In Family: 18+ genera, 250 species: especially America (Africa, Pacific).
eFlora Treatment Author: Larry Hufford & Barry Prigge, except as noted
Scientific Editor: Douglas H. Goldman, Bruce G. Baldwin.
Genus: MentzeliaView DescriptionDichotomous Key

Habit: Annual to perennial herb; hairs barbed to needle-like, not stinging; stems pale pink or generally +- white, branched or not. Leaf: linear to ovate, entire to pinnate-lobed; basal in rosettes, generally petioled; cauline generally sessile, +- reduced distally on stem. Inflorescence: generally cyme (or flower 1); bracts green to white, margin green. Flower: sepals lanceolate to deltate, persistent; petals generally 5, free, white to yellow or orange; stamens generally many, +- free, generally unequal, inner filaments generally thread-like; outermost stamens opposite sepal lobes generally modified, +- widened, or petal-like with anther or not; ovary generally cylindric, placentas generally 3, style thread-like, stigma 3-furrowed or -lobed. Fruit: capsule, cup-, barrel-, or urn-shaped to narrowly cylindric, occasionally curved. Seed: generally many, shape variable.
Species In Genus: +- 100 species: western North America, +- tropical America.
eFlora Treatment Author: Joshua M. Brokaw, John J. Schenk & Barry Prigge
Reference: Darlington 1934 Ann Missouri Bot Gard 21:103--226
Mentzelia dispersa S. Watson
Habit: Annual 7--48 cm. Stem: erect, hairy. Leaf: < 10 cm, lower entire to toothed (lobed), upper entire to toothed. Inflorescence: bracts ovate to round, entire to lobed, green. Flower: sepals 1--3.5 mm; petals 2--6(8) mm, ovate to obovate, yellow throughout (base orange); stamens < 4.5 mm; style 1--3.5(5) mm. Fruit: erect to curved < 30°, 7--25 mm, 1--2.5 mm wide, narrowly cylindric. Seed: 0.5--1.5 mm, 0.5--1 mm wide, +- prism-shaped, ×-section triangular, longitudinal edges grooved, tan, dark-mottled or not; seed coat cells minute. Chromosomes: 2n=18,36,72.
Ecology: Loamy to sandy or rocky slopes, roadsides; Elevation: 900--3100 m. Bioregional Distribution: CA-FP, GB; Distribution Outside California: to British Columbia, north-central United States, New Mexico. Flowering Time: May--Aug Note: Intergrades with Mentzelia affinis.
Synonyms: Mentzelia pinetorum A. Heller; Mentzelia dispersa var. compacta (A. Nelson) J.F. Macbr.; Mentzelia dispersa var. dispersa; Mentzelia dispersa var. latifolia (Rydb.) J.F. Macbr.; Mentzelia dispersa var. obtusa Jeps.;
Jepson eFlora Author: Joshua M. Brokaw, John J. Schenk & Barry Prigge
Reference: Darlington 1934 Ann Missouri Bot Gard 21:103--226
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Botanical illustration including Mentzelia dispersa

botanical illustration including Mentzelia dispersa


Citation for this treatment: Joshua M. Brokaw, John J. Schenk & Barry Prigge 2012, Mentzelia dispersa, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on December 15, 2018.

Citation for the whole project: Jepson Flora Project (eds.) 2018, Jepson eFlora,, accessed on December 15, 2018.

Mentzelia dispersa
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© 2016 Keir Morse
Mentzelia dispersa
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© 2014 Neal Kramer
Mentzelia dispersa
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© 2012 Neal Kramer
Mentzelia dispersa
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© 2016 Keir Morse
Mentzelia dispersa
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© 2003 Steve Matson
Mentzelia dispersa
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© 2015 Barry Breckling

More photos of Mentzelia dispersa in CalPhotos

Geographic subdivisions for Mentzelia dispersa:
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

View elevation by latitude chart
Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.