Jepson eFlora: Taxon page
Vascular Plants of California
Key to families | Table of families and genera
Previous taxon Index to accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Next taxon

Mentzelia laevicaulis

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 laevicaulis (Douglas ex Hook.) Torr. & A. Gray
Habit: Perennial herb 22--100 cm. Stem: erect, glabrous to hairy. Leaf: lower < 24 cm, oblanceolate, generally pinnately lobed; upper 2--10 cm, lanceolate, generally dentate to serrate. Inflorescence: bracts linear to lanceolate, entire to deeply 4--5-lobed, green. Flower: sepals 15--46 mm; petals 40--80 mm, 8--18 mm wide, adaxially yellow, tip acute; stamens 15--55 mm, filaments of 5 outermost 40--55 mm, 1--2 mm wide, linear, with anthers; style 2.5--7 cm. Fruit: erect, 15--44 mm, 8--13 mm wide, cylindric. Seed: 3--4 mm, 2--2.5 mm wide, lenticular, winged, gray. Chromosomes: 2n=22.
Ecology: Sandy to rocky slopes, washes, roadcuts; Elevation: < 2900 m. Bioregional Distribution: CA (exc DSon); Distribution Outside California: to British Columbia, Montana, Wyoming, Nevada. Flowering Time: May--Oct
Jepson eFlora Author: Joshua M. Brokaw, John J. Schenk & Barry Prigge
Reference: Darlington 1934 Ann Missouri Bot Gard 21:103--226
Jepson Online Interchange

Previous taxon: Mentzelia jonesii
Next taxon: Mentzelia lindleyi

Name Search

Botanical illustration including Mentzelia laevicaulis

botanical illustration including Mentzelia laevicaulis


Citation for this treatment: Joshua M. Brokaw, John J. Schenk & Barry Prigge 2012, Mentzelia laevicaulis, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on April 19, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora,, accessed on April 19, 2019.

Mentzelia laevicaulis
click for enlargement
© 2002 Gary A. Monroe
Mentzelia laevicaulis
click for enlargement
© 2015 California Academy of Sciences
Mentzelia laevicaulis
click for enlargement
© 2015 Neal Kramer
Mentzelia laevicaulis
click for enlargement
© 2013 Gary A. Monroe
Mentzelia laevicaulis
click for enlargement
© 2015 Neal Kramer
Mentzelia laevicaulis
click for enlargement
© 2011 James M. Andre

More photos of Mentzelia laevicaulis in CalPhotos

Geographic subdivisions for Mentzelia laevicaulis:
CA (exc DSon);
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.
View all CCH records

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.