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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

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.
eFlora Treatment Author: Joshua M. Brokaw, John J. Schenk & Barry Prigge
Jepson Online Interchange

Previous taxon: Mentzelia desertorum
Next taxon: Mentzelia eremophila

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botanical illustration including Mentzelia dispersa


Citation for this treatment: Joshua M. Brokaw, John J. Schenk & Barry Prigge 2016. Mentzelia dispersa, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 06, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 06, 2016.

Mentzelia dispersa
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© 2003 Steve Matson
Mentzelia dispersa
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© 2000 Gary A. Monroe
Mentzelia dispersa
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© 2015 Barry Breckling
Mentzelia dispersa
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© 2012 Neal Kramer
Mentzelia dispersa
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© 2009 Thomas Stoughton
Mentzelia dispersa
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© 2009 Thomas Stoughton

More photos of Mentzelia dispersa in CalPhotos

Geographic subdivisions for Mentzelia dispersa:
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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.
Blue line denotes eFlora flowering time.