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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. pterosperma Eastw. WING-SEED BLAZING STAR
NATIVE
Biennial, perennial herb 6–42 cm. Stem: erect, hairy. Leaf: 1–8(13) cm, 6–22 mm wide, lower elliptic to oblanceolate, entire to short-toothed, upper elliptic to lanceolate, toothed (lobed near base). Inflorescence: bracts narrowly lanceolate, entire, green. Flower: sepals 6–10 mm; petals 9–12(24) mm, 2–5 mm wide, yellow, tip acute; stamens 4–15 mm; filaments of 5 outermost 5–15 mm, 1–3 mm wide, narrowly oblanceolate, without anther; style 6–11(17) mm. Fruit: erect, 8–14 mm, 5–10 mm wide, cup-shaped to cylindric. Seed: ± 2.5–4 mm, ± 3 mm wide, lenticular, winged, white.
2n=22. ± white gypsum-rich soils; 1000–1200 m. e Desert Mountains; to Colorado, northwestern Arizona. Apr–Jun [Online Interchange] {CNPS list}

Previous taxon: Mentzelia polita
Next taxon: Mentzelia puberula

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Jul 30 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=33277, accessed on Jul 30 2014

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Bioregions in which Mentzelia pterosperma occurs 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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CCH collections by month

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