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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 8–54 cm. Stem: erect to decumbent, hairy. Leaf: 2–12 cm; generally toothed to lobed. Inflorescence: bracts lanceolate to ovate, generally toothed to lobed, green. Flower: sepals 3–13 mm; petals 8–22 mm, obovate, orange to yellow, base red to orange; stamens 4–11 mm; style 5–13 mm. Fruit: erect to curved < 90°, 12–35 mm, 2–4 mm wide, obconic. Seed: 1–2 mm, irregularly angular above mid-fruit, sides concave, ×-section occasionally triangular with grooves along longitudinal edges below mid-fruit, tan, dark-mottled or not; seed coat cells generally pointed or domed, in age > 1/2 tall as wide on seed surface edges.
2n=18. Slopes of sandy to gray-white, calcium-rich soils, grassland to oak woodland; < 1400 m. s Sierra Nevada Foothills, s San Joaquin Valley, s Outer South Coast Ranges, n Western Transverse Ranges. Mar–May [Online Interchange]
Previous taxon: Mentzelia oreophila
Next taxon: Mentzelia polita
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Feb 27 2015
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=33274, accessed on Feb 27 2015
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|Geographic subdivisions indicated for the distribution of Mentzelia pectinata|| 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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