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LOASACEAE LOASA FAMILY

Larry Hufford & Barry Prigge, except as noted

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

MENTZELIA BLAZING STAR

Joshua M. Brokaw, John J. Schenk & Barry Prigge

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.
± 100 species: western North America, ± tropical America. [Darlington 1934 Ann Missouri Bot Gard 21:103–226]

Key to Mentzelia

M. puberula J. Darl. DARLINGTON'S BLAZING STAR
NATIVE
Perennial herb 15–54 cm. Stem: erect, hairy. Leaf: 2–6.5 cm, 10–40 mm wide, lower widely obovate to elliptic or widely elliptic, toothed, upper sessile, ovate to broadly elliptic, base not clasping. Inflorescence: bracts linear, entire, green. Flower: sepals 5–9 mm; petals 7–14 mm, 2–6 mm wide, yellow, tip obtuse; stamens 3–12 mm, filaments of 5 outermost 5–12 mm, 1.5–3 mm wide, oblanceolate, tip irregularly cut, round to acute, with anther; style 4–7 mm. Fruit: erect, 5–10 mm, 5–7 mm wide, cup-shaped. Seed: ± 3 mm, ± 2 mm wide, lenticular, winged, white.
Sandy crevices in cliffs or rocky slopes; 90–1280 m. se Mojave Desert, e Sonoran Desert; to Arizona, Mexico. Mar–May [Online Interchange] {CNPS list}

Previous taxon: Mentzelia pterosperma
Next taxon: Mentzelia ravenii

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Nov 24 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=33278, accessed on Nov 24 2014

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Geographic subdivisions indicated for the distribution of Mentzelia puberula 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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map of distribution 1
(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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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.