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Key to families | Table of families and genera

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Larry Hufford & Barry Prigge, except as noted

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.
18+ genera, 250 species: especially America (Africa, Pacific). [Ernst & Thompson 1963 J Arnold Arbor 44:138–142] —Scientific Editors: Douglas H. Goldman, Bruce G. Baldwin.

Key to Loasaceae


Joshua M. Brokaw, John J. Schenk & Barry Prigge

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.
± 100 species: western North America, ± tropical America. [Darlington 1934 Ann Missouri Bot Gard 21:103–226]

Key to Mentzelia

Perennial herb 12–33 cm. Stem: erect to decumbent, glabrous to puberulent. Leaf: < 7 cm, 2–10 mm wide, linear to narrowly elliptic or oblanceolate, generally entire. Inflorescence: bracts narrowly lanceolate, entire, green. Flower: sepals 5–7 mm; petals 8–14 mm, 2–4 mm wide, ± white to pale-yellow, tip round; stamens 3–10 mm, filaments of 5 outermost 6–10 mm, 1–2.7 mm wide, oblanceolate, tip generally notched, anther attached generally without thread-like stalk; style 5–7 mm. Fruit: erect, 5–9 mm, 5–9 mm wide, cup-shaped. Seed: ± 3 mm, ± 2 mm wide, lenticular, winged, white.
2n=22. Washes, limestone, ± white gypsum-rich soils; 1200–1500 m. e Mojave Desert (ne Clark Mtn Range); southern Nevada. May–Jun [Online Interchange] {CNPS list}

Previous taxon: Mentzelia pectinata
Next taxon: Mentzelia pterosperma


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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora,, accessed on Nov 25 2015
Citation for this treatment: [Author of taxon treatment] 2013. Mentzelia, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on Nov 25 2015

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Geographic subdivisions indicated for the distribution of Mentzelia polita 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).

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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.