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Key to Loasaceae
Loasaceae
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40916
1 Stamens 5; fruits indehiscent (a cypsela with a persistent perianth), bearing one seed each; plants with four trichome types (knobbed, retrorse, dendritic, and stinging), these sometimes but not always all present on the same plant; [s., c., and nc. TX southwestwards]
1 Stamens numerous (8-50+), often strongly exerted; petals 5 (sometimes superficially appearing to have ca. 10+ due to the presence of 5+ petaloid stamen filaments and 5 petals), fruits dehiscent (capsules with apical dehiscence); plants with two types of trichomes (antrorse/smooth or retrorse); [FL; s. and nc. TX northwards through AR, MO to ne IL westwards]