Syst. Veg. 1: 127. 1824
Herbs, perennial, from creeping rhizomes. Stems branched or rarely simple. Leaves mostly basal; blade flat, ensiform. Inflorescences rhipidiate; spathes green. Flowers lasting one day, actinomorphic; tepals spreading, distinct, white [blue], unequal, outer whorl smaller than inner; filaments shortly connate basally; anthers not appressed to style branches; style dividing into 3 filiform branches, extending between stamens below anthers. Capsules ± ovoid, cartilaginous to woody. Seeds many, angular; seed coat light to dark brown. x = 19.
Introduced; Australasia, South America (Andes).
Species ca. 11 (1 in the flora).