Jepson eFlora: Taxon page
Vascular Plants of California
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Mentzelia longiloba

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 longiloba J. Darl.
Habit: Biennial or Perennial herb 15--100 cm. Stem: erect, glabrous to hairy. Leaf: 1--15 cm, 1--2 cm wide, lower oblanceolate to elliptic, crenate to pinnate-lobed, upper lanceolate to elliptic, toothed. Inflorescence: bracts 0 or linear to lanceolate, generally entire, green. Flower: sepals 6--12 mm; petals 12--20 mm, 4--6 mm wide, yellow, tip obtuse to round; stamens 3--17 mm, filaments of 5 outermost 10--20 mm, 3--6 mm wide, spoon-shaped, tip round, generally without anthers; style 8--13 mm. Fruit: erect, 10--18 mm, 7--10 mm wide, cylindric to occasionally cup-shaped. Seed: 3--4 mm, 2.5--3.5 mm wide, lenticular, winged, +- white.
Ecology: Sandy flats, creosote-bush scrub; Elevation: < 800 m. Bioregional Distribution: D; Distribution Outside California: Arizona, northern Mexico. Flowering Time: Mar--Jun
Synonyms: Mentzelia multiflora (Nutt.) A. Gray subsp. longiloba (J. Darl.) Felger; Mentzelia multiflora var. longiloba (J. Darl.) Kartesz
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)

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Citation for this treatment: Joshua M. Brokaw, John J. Schenk & Barry Prigge 2012, Mentzelia longiloba, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on August 11, 2022.

Citation for the whole project: Jepson Flora Project (eds.) 2022, Jepson eFlora,, accessed on August 11, 2022.

Mentzelia longiloba
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© 2009 Keir Morse
Mentzelia longiloba
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© 2012 James M. Andre
Mentzelia longiloba
click for enlargement
© 2009 Keir Morse
Mentzelia longiloba
click for enlargement
© 2004 James M. Andre
Mentzelia longiloba
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© 2012 Neal Kramer
Mentzelia longiloba
click for enlargement
© 2012 James M. Andre

More photos of Mentzelia longiloba in CalPhotos

Geographic subdivisions for Mentzelia longiloba:
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).