Iris nelsonii is a species in the genus Iris, it is also in the subgenus Limniris and in the series hexagonae. It is a rhizomatous perennial, from northern America. It has long drooping, grass-like leaves, tall stems, 10 red-purple flowers.
Iris nelsonii spreads into large colonies by rhizomes.It has long and narrow grass-like green leaves, which are often droop and becoming glaucous. They are 1–3 centimetres (0.39–1.18 in) wide and grow up to 80–90 cm (31–35 in) long. They do not grow as tall as ...