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Key to families | Table of families and genera
Indexes to all accepted names and synonyms:
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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
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.Key to Petalonyx
5 species: southwestern United States, northwestern Mexico. (Greek: petal claw) [Davis & Thompson 1967 Madroño 19:1–32]
Plant 15–45 cm. Leaf: 15–40 mm, generally ovate, widely tapered to base, acute to acuminate, serrate to sparsely dentate. Inflorescence: 3–4.5 cm; outer bract 5–13 mm, narrowly ovate; inner bracts 1–5 mm, elliptic to ovate, truncate, crenate; pedicels 1–2 mm. Flower: petals 5–11 mm, cream, upper 1/4 of claws adherent; stamens 7–14 mm, well exserted; style 8–15 mm.
Sandy washes or rocky canyons, creosote-bush scrub, Joshua-tree woodland, pinyon/juniper woodland; 725–2100 m. White and Inyo Mountains, Desert Mountains, w Mojave Desert; to southwestern Utah, northwestern Arizona. May–Jul [Online Interchange]
Previous taxon: Petalonyx linearis
Next taxon: Petalonyx thurberi
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Mar 7 2014
Citation for this treatment: [Author of taxon treatment] 2012. Petalonyx, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=37312, accessed on Mar 7 2014
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