Amaryllis of tropical America often cultivated as a houseplant for its showy white to red flowers WordNet 3.0 & Open English WordNet

Hippeastrum puniceum is a bulbous perennial native to tropical regions of South America, although it has become naturalized elsewhere. Wikipedia

Hippeastrum is a genus of about 90 species, and over 600 hybrids and cultivars, of perennial, herbaceous and bulbous plants, native to tropical and subtropical regions of the Americas, from Mexico south to Argentina and on some islands in the Caribbean. Wikipedia

A genus of South American bulbs whose cultivars are commonly sold as "amaryllis" Wikipedia Disambiguation