Echinodorus (Amazon swords) is the rosette plant genus from South America. E. bleheri is the standard Amazon sword, reaching 20+ inches in established tanks. E. ozelot (red/black ozelot, green ozelot) features distinctive spotted leaves. E. tenellus (now Helanthium tenellum) is the chain sword carpet variant.
Swords are heavy root feeders - root tabs in the substrate matter more than water-column dosing. Moderate light (50-100 PAR) and eventual large size (40-100+ gallon tanks accommodate adults).