Southern South America: Argentina; Paraguay; Uruguay
Plants annual; roots fibrous. Stems prostrate to suberect; trichomes conspicuous at nodes and in inflorescence; branches to 30 cm. Leaf blades linear to lanceolate, terete to hemispheric, 5-30 × 1-5 mm, apex acute or subacute; involucrelike leaves 8-9(-14). Flowers 25-55 mm diam.; petals pink, red, purple, yellow, bronze, or white, obovate, 15-25 × 15-20 mm; stamens 40 or more; stigmas 5-8. Capsules ovoid, (3.5-)4-6.5 mm diam. Seeds steely gray, often iridescent, orbiculate or elongate, flattened, 0.75-1 mm diam.; surface cells obscurely stellate with tubercles mostly abaxially. 2n = 18. Flowering late spring-fall. Sandy soils.