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Key to families | Table of families and genera
Indexes to all accepted names and synonyms:
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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 3–45 cm. Stem: erect, hairy. Leaf: 1–18 cm, lower lobed, upper toothed to lobed (entire). Inflorescence: bracts generally ovate, toothed to lobed (entire), base green to ± white. Flower: sepals 1–5 mm; petals 4–7(10) mm, obovate, orange to yellow, base generally red to orange; stamens 3–7 mm; style (3)3.5–6 mm. Fruit: erect to curved 40° (70°), 8–28 mm, 2–4 mm wide, obconic. Seed: 1–2 mm, irregularly angular, tan, dark-mottled, edges generally acute; seed coat cells generally pointed or domed, > 1/2 tall as wide on seed surface edges in age.
2n=54. Loamy to sandy desert, grassland, scrub, oak/pine woodland; 200–2500 m. n High Sierra Nevada, Tehachapi Mountain Area, San Joaquin Valley, Inner South Coast Ranges, Transverse Ranges, Peninsular Ranges, Great Basin Floristic Province, Desert; Oregon, Nevada, Arizona, Baja California. Yellow-petaled forms generally restricted to pine/oak woodland, grassland. Intergrades with Mentzelia gracilenta, Mentzelia ravenii, Mentzelia montana, Mentzelia albicaulis. Mar–Jun [Online Interchange]
Previous taxon: Mentzelia tridentata
Next taxon: Petalonyx
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Apr 19 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=33294, accessed on Apr 19 2014
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