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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 10–80 cm. Stem: erect, hairy. Leaf: 1–18 cm, irregularly dentate, wavy or lobed. Inflorescence: bracts ovate to round, entire to crenate, generally concealing flower, green. Flower: sepals 1.5–2 mm; petals 2.5–4.5 mm, ovate, yellow; stamens 1.5–4 mm, filaments of 5 outermost widened, distally 2-lobed; style 2–3(5) mm. Fruit: erect to curved < 20°, 6–13 mm, 1.5–2.5 mm wide, cylindric. Seed: 5–10, 1.5–2.5 mm, ± 1 mm wide, ± prism-shaped, ×-section triangular, longitudinal edges grooved, tan and dark-mottled to black; seed coat cells minute.
2n=18. Open, generally recent-burned or disturbed chaparral and oak woodland; < 2256 m. Klamath Ranges, North Coast Ranges, San Francisco Bay Area, South Coast Ranges, Southwestern California; Baja California. Apr–Jun [Online Interchange]
Previous taxon: Mentzelia longiloba
Next taxon: Mentzelia montana
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Dec 18 2014
Citation for this treatment: [Author of taxon treatment] 2013. Mentzelia, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=33259, accessed on Dec 18 2014
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|Geographic subdivisions indicated for the distribution of Mentzelia micrantha|| 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.
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(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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