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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 5–47 cm. Stem: erect, hairy. Leaf: 1–17 cm, lower lobed (toothed), upper entire to lobed. Inflorescence: bracts lanceolate to obovate, entire to toothed, green. Flower: sepals 2–7 mm; petals 3–10 mm, generally ovate, yellow, base yellow to orange; stamens < 6.5 mm; style 3–6.5 mm. Fruit: erect to curved < 90°, 12–28 mm, 1–3 mm wide, narrowly cylindric. Seed: 1–2 mm, ± 1 mm wide, ± prism-shaped, ×-section triangular with longitudinal edges grooved, tan, dark-mottled or not; seed coat cells minute.
2n=18. Rocky or gray-white soils in grassland, woodland, creosote-bush scrub; < 1200 m. s Sierra Nevada, San Joaquin Valley, se San Francisco Bay Area (Mount Hamilton), Inner South Coast Ranges, s Channel Islands, Transverse Ranges, San Jacinto Mountains, Desert; to Arizona, Baja California. Intergrades with Mentzelia dispersa. Apr–May [Online Interchange]
Previous taxon: Mentzelia
Next taxon: Mentzelia albicaulis
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Apr 23 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=33219, accessed on Apr 23 2014
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