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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

PETALONYX SANDPAPER-PLANT
Subshrub; hairs barbed. Leaf: linear to ± round, entire to toothed; base tapered to cordate. Inflorescence: raceme, generally terminal; bracts 3 per flower, outer 1 > inner 2. Flower: sepals ± deciduous; petals free or claws adherent, fused below blades; stamens generally 5, free; ovary ± ovoid, placenta 1, stigma 1. Fruit: achene, ± ovoid, generally 5-veined or -ribbed, erect. Seed: 1, 1.5–2.5 mm, ± fusiform, generally smooth.
2n=46.
5 species: southwestern United States, northwestern Mexico. (Greek: petal claw) [Davis & Thompson 1967 Madroño 19:1–32]

Key to Petalonyx

P. thurberi A. Gray
NATIVE
Plant < 100 cm. Leaf: clasping, 4–45 mm, lanceolate to deltate-ovate, acute to acuminate, entire to few-toothed. Inflorescence: 1–4 cm; outer bract 4–7.5 mm, deltate-ovate; inner bracts 2–3 mm, lanceolate to ovate, tapered to cordate, acute to ± acuminate, crenate or lobed; pedicels < 1 mm. Flower: petals 2.5–6.5 mm, cream, claws adherent, fused in upper 1/5; stamens well exserted; style 3–11 mm. [Online Interchange]

P. thurberi subsp. gilmanii (Munz) W.S. Davis & H.J. Thomps. DEATH VALLEY SANDPAPER-PLANT
NATIVE
Hairs soft, spreading. Flower: stamens 4–7.5 mm.
Sandy washes, dunes; < 1200 m. n Mojave Desert. May–Jun, Sep–Nov [Online Interchange] {CNPS list}
Unabridged synonyms: [Petalonyx gilmanii Munz]

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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 23 2014
Citation for this treatment: [Author of taxon treatment] 2013. Petalonyx, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=52103, accessed on Jul 23 2014

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Bioregions in which Petalonyx thurberi subsp. gilmanii 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.