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Petalonyx is a small genus of flowering plants native to the southwestern United States and northern Mexico. They are known commonly as sandpaper plants, and are most often found in warm, dry desert regions. Sandpaper plants are that get their common name from their rough foliage, which is covered in tiny, stiffly curved hairs. They bear of claw-shaped flowers with long extending well beyond the corolla, and unusual in that they emerge from outside the corolla.A REVISION OF PETALONYX (LOASACEAE) WITH A CONSIDERATION OF AFFINITIES IN SUBFAMILY GRONOVIOIDEAEWilliam S. Davis and Henry J. ThompsonMadroñoVol. 19, No. 1 (JANUARY, 1967), pp. 1-18Published by: California Botanical SocietyStable URL: [1]
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