Jepson eFlora: Taxon page
Vascular Plants of California
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Mentzelia pectinata

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.

eFlora Treatment Author: Joshua M. Brokaw, John J. Schenk & Barry Prigge
Reference: Darlington 1934 Ann Missouri Bot Gard 21:103--226
Mentzelia pectinata Kellogg
Habit: Annual 8--54 cm. Stem: erect to decumbent, hairy. Leaf: 2--12 cm; generally toothed to lobed. Inflorescence: bracts lanceolate to ovate, generally toothed to lobed, green. Flower: sepals 3--13 mm; petals 8--22 mm, obovate, orange to yellow, base red to orange; stamens 4--11 mm; style 5--13 mm. Fruit: erect to curved < 90°, 12--35 mm, 2--4 mm wide, obconic. Seed: 1--2 mm, irregularly angular above mid-fruit, sides concave, ×-section occasionally triangular with grooves along longitudinal edges below mid-fruit, tan, dark-mottled or not; seed coat cells generally pointed or domed, in age > 1/2 tall as wide on seed surface edges. Chromosomes: 2n=18.
Ecology: Slopes of sandy to gray-white, calcium-rich soils, grassland to oak woodland; Elevation: < 1400 m. Bioregional Distribution: s SNF, s SnJV, s SCoRO, n WTR. Flowering Time: Mar--May
Jepson eFlora Author: Joshua M. Brokaw, John J. Schenk & Barry Prigge
Reference: Darlington 1934 Ann Missouri Bot Gard 21:103--226
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

Previous taxon: Mentzelia oreophila
Next taxon: Mentzelia polita

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Botanical illustration including Mentzelia pectinata

botanical illustration including Mentzelia pectinata


Citation for this treatment: Joshua M. Brokaw, John J. Schenk & Barry Prigge 2012, Mentzelia pectinata, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on February 02, 2023.

Citation for the whole project: Jepson Flora Project (eds.) 2023, Jepson eFlora,, accessed on February 02, 2023.

Mentzelia pectinata
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© 2017 Barry Rice
Mentzelia pectinata
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© 2015 Barry Breckling
Mentzelia pectinata
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© 2005 Steve Matson
Mentzelia pectinata
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© 2005 Steve Matson
Mentzelia pectinata
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© 2005 Christopher L. Christie
Mentzelia pectinata
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© 1997 Christopher L. Christie

More photos of Mentzelia pectinata in CalPhotos

Geographic subdivisions for Mentzelia pectinata:
s SNF, s SnJV, s SCoRO, n WTR.
1. You can change the display of the base map layer control box in the upper right-hand corner.
2. County and Jepson Region polygons can be turned off and on using the check boxes.
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).


Data provided by the participants of the  Consortium of California Herbaria.
View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

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 (fruiting time in some monocot genera).