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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
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.Key to Mentzelia
± 100 species: western North America, ± tropical America. [Darlington 1934 Ann Missouri Bot Gard 21:103–226]
Annual 5–41 cm. Stem: erect, glabrous to hairy. Leaf: 1–12 cm, lower toothed to lobed, upper entire to lobed. Inflorescence: bracts lanceolate to ovate, generally entire, green. Flower: sepals 2–4 mm; petals 2.5–6 mm, ovate to obovate, yellow, base yellow to orange; stamens = style; style 2–4 mm. Fruit: generally curved < 180°, 12–27 mm, 1–2.5 mm wide, obconic. Seed: ± 1 mm, irregular-rounded to -angular above mid-fruit, ×-section occasionally triangular with grooves along longitudinal edges below mid-fruit, tan, not or sparsely dark-mottled; seed coat cells generally flat-surfaced in age.
2n=18. Sandy flats in creosote-bush scrub; < 950 m. Desert; Baja California. Intergrades with Mentzelia obscura. Feb–Mar [Online Interchange]
Previous taxon: Mentzelia crocea
Next taxon: Mentzelia dispersa
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Mar 7 2014
Citation for this treatment: [Author of taxon treatment] 2012. Mentzelia, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=33235, accessed on Mar 7 2014
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