Jepson eFlora: Taxon page
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 crocea

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 crocea Kellogg
Habit: Annual 34--100 cm. Stem: erect, hairy. Leaf: 1--40 cm, lower lobed, upper toothed to lobed. Inflorescence: bracts ovate to obovate, 6--10-toothed, green. Flower: sepals 7--20 mm; petals 21--36 mm, 8--17(21) mm wide, elliptic to obovate, yellow, base generally orange; stamens 11--28 mm, outer > inner; style 20--35 mm. Fruit: erect to curved < 45°, 20--35 mm, 3--5 mm wide, obconic. Seed: 1.5--2 mm, irregular-rounded to -angular, tan, dark-mottled; seed coat cells minute, domed to pointed. Chromosomes: 2n=36.
Ecology: Rocky slopes, roadsides, grassland, oak/pine woodland; Elevation: < 1700 m. Bioregional Distribution: c&s SNF, s SNH. Flowering Time: May--Jun Note: Intergrades with Mentzelia lindleyi.
Synonyms: Mentzelia lindleyi Torr. & A. Gray subsp. crocea (Kellogg) C.B. Wolf
eFlora Treatment Author: Joshua M. Brokaw, John J. Schenk & Barry Prigge
Jepson Online Interchange

Previous taxon: Mentzelia congesta
Next taxon: Mentzelia desertorum

Name Search
botanical illustration including Mentzelia crocea


Citation for this treatment: Joshua M. Brokaw, John J. Schenk & Barry Prigge 2016. Mentzelia crocea, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on April 30, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on April 30, 2016.

Mentzelia crocea
click for enlargement
© 2007 Neal Kramer
Mentzelia crocea
click for enlargement
© 2009 Barry Breckling
Mentzelia crocea
click for enlargement
© 2002 Christopher L. Christie
Mentzelia crocea
click for enlargement
© 2012 Gary A. Monroe
Mentzelia crocea
click for enlargement
© 2016 California Academy of Sciences
Mentzelia crocea
click for enlargement
© 2007 Neal Kramer

More photos of Mentzelia crocea in CalPhotos

Geographic subdivisions for Mentzelia crocea:
c&s SNF, s SNH.
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.
View all CCH records

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.