Two hundred or more species of clump-forming perennial herbs, many of which are popular ornamentals, cultivated for their showy flowers. The following selections prefer moist soil. Like the species, above, but with white flowers. At home in or near water, but does well under ordinary moisture conditions also.
Leaves are long, slender, strongly upright.
Very neat and attractive, even when not in flower. A delicate woodland species with slender, evergreen leaves. Spreads slowly by rhizomes, forming a dense colony. Will grow in wet soil or shallow water, but does well in ordinary moist soil also.