Jepson eFlora: Taxon page
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Mentzelia albicaulis

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 albicaulis (Douglas ex Hook.) Douglas ex Torr. & A. Gray
Habit: Annual 5--42 cm. Stem: erect to decumbent, glabrous to hairy. Leaf: 1--11 cm, lower lobed, upper entire to lobed. Inflorescence: bracts lanceolate to ovate, 3-toothed to entire, green, occasionally +- white base, faint, small. Flower: sepals 1--5 mm; petals 2--7(8) mm, ovate to obovate, yellow, base generally orange; stamens 3--5 mm; style 2--5 mm. Fruit: generally curved < 180°, 8--28(34) mm, 1.5--3.5 mm wide, obconic. Seed: 1--1.5 mm, irregular-rounded to -angular above mid-fruit, ×-section occasionally triangular with grooves along longitudinal edges below mid-fruit; tan, dark-mottled, to black; seed coat cells pointed or domed, in age > 1/2 tall as wide on seed surface edges. Chromosomes: 2n=54,72.
Ecology: Sand dunes, gravel fans, washes, creosote-bush scrub, pinyon/juniper woodland; Elevation: < 2300 m. Bioregional Distribution: Teh, SnGb, SnBr, GB, D; Distribution Outside California: to British Columbia, Nebraska, Baja California. Flowering Time: Mar--Jul Note: Intergrades with Mentzelia montana, Mentzelia obscura, Mentzelia veatchiana. If recognized taxonomically, plants with n=27 assignable to Mentzelia californica H.J. Thomps. & J.E. Roberts or Mentzelia mojavensis H.J. Thomps. & J.E. Roberts.
eFlora Treatment Author: Joshua M. Brokaw, John J. Schenk & Barry Prigge
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botanical illustration including Mentzelia albicaulis


Citation for this treatment: Joshua M. Brokaw, John J. Schenk & Barry Prigge 2016. Mentzelia albicaulis, 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 albicaulis
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© 2009 Keir Morse
Mentzelia albicaulis
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© 2014 Steve Matson
Mentzelia albicaulis
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© 1999 Gary A. Monroe
Mentzelia albicaulis
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© 2009 California Academy of Sciences
Mentzelia albicaulis
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© 2004 James M. Andre
Mentzelia albicaulis
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© 2009 Steve Matson

More photos of Mentzelia albicaulis in CalPhotos

Geographic subdivisions for Mentzelia albicaulis:
Teh, SnGb, SnBr, GB, D;
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.