Jepson eFlora: Taxon page
Vascular Plants of California
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Mentzelia longiloba


Higher Taxonomy
Family: LoasaceaeView DescriptionDichotomous Key
Common Name: LOASA FAMILY
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


Common Name: BLAZING STAR
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.
NATIVE
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
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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, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=33256, accessed on December 06, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on December 06, 2019.

Mentzelia longiloba
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© 2011 Neal Kramer
Mentzelia longiloba
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© 2004 James M. Andre
Mentzelia longiloba
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© 2012 Neal Kramer
Mentzelia longiloba
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© 2009 Keir Morse
Mentzelia longiloba
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© 2009 Keir Morse
Mentzelia longiloba
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© 2004 James M. Andre

More photos of Mentzelia longiloba in CalPhotos



Geographic subdivisions for Mentzelia longiloba:
D
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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.