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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 5–42 cm. Stem: erect to decumbent, glabrous to hairy. Leaf: 1–11 cm, lower lobed, upper entire to lobed. Inflorescence: bracts lanceolate to ovate, 3-toothed to entire, green, occasionally ± white base, faint, small. Flower: sepals 1–5 mm; petals 2–7(8) mm, ovate to obovate, yellow, base generally orange; stamens 3–5 mm; style 2–5 mm. Fruit: generally curved < 180°, 8–28(34) mm, 1.5–3.5 mm wide, obconic. Seed: 1–1.5 mm, irregular-rounded to -angular above mid-fruit, ×-section occasionally triangular with grooves along longitudinal edges below mid-fruit; tan, dark-mottled, to black; seed coat cells pointed or domed, in age > 1/2 tall as wide on seed surface edges.
2n=54,72. Sand dunes, gravel fans, washes, creosote-bush scrub, pinyon/juniper woodland; < 2300 m. Tehachapi Mountain Area, San Gabriel Mountains, San Bernardino Mountains, Great Basin Floristic Province, Desert; to British Columbia, Nebraska, Baja California. Intergrades with Mentzelia montana, Mentzelia obscura, Mentzelia veatchiana. If recognized taxonomically, plants with n=27 assignable to Mentzelia californica H.J. Thomps. & J.E. Roberts or Mentzelia mojavensis H.J. Thomps. & J.E. Roberts. Mar–Jul [Online Interchange]
Unabridged note: Expanded author citation: Mentzelia albicaulis (Douglas ex Hook.) Douglas ex Torr. & A. Gray
Previous taxon: Mentzelia affinis
Next taxon: Mentzelia congesta
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=33221, accessed on Apr 23 2014
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