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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. lindleyi Torr. & A. Gray
NATIVE
Annual 10–70 cm. Stem: erect, hairy. Leaf: 2–17 cm, generally deeply lobed. Inflorescence: bracts lanceolate to ovate, toothed or lobed, green. Flower: sepals 9–19 mm; petals 20–40 mm, (12)16–33 mm wide, yellow, base orange; stamens 20–30 mm, outer > inner; style 15–24 mm. Fruit: generally erect to curved < 90°, 25–40 mm, 4–5 mm wide, obconic. Seed: 1–2.5 mm, irregularly rounded to winged, tan, dark-mottled or not, seed coat cells minute, domed.
2n=36. Rocky, open slopes, coastal-sage scrub, oak/pine woodland; < 1350 m. San Joaquin Valley, e San Francisco Bay Area, n Inner South Coast Ranges. Waif populations occur outside native range. Intergrades with Mentzelia crocea. May–Jun [Online Interchange]

Previous taxon: Mentzelia laevicaulis
Next taxon: Mentzelia longiloba

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Apr 24 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=33255, accessed on Apr 24 2014

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Bioregions in which Mentzelia lindleyi 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.