Dale W. McNeal Jr. in Flora of North America (vol. 26)
Herbs, perennial, scapose, from corms. Corm solitary, coated with membrane. Leaves 2-7, basal; blade linear, channeled to terete; veins sometimes scabrous, particularly proximally. Scapes 1 or rarely 2, persistent, terete, sometimes scabrous, particularly proximally. Inflorescences falsely umbellate, 1-30-flowered, subtended by 4 narrowly triangular bracts that do not enclose flowers in bud. Flowers sessile but appearing pedicellate, 4-15 cm; perianth salverform; tepals 6, connate basally into long, slender tube; perianth lobes white with green, pink, or blue abaxial stripes, shorter than tube; stamens 6, inserted on perianth tube, distinct; ovary superior, 3-locular, long-stipitate, stipe adnate to perianth tube on 3 angles; style usually exserted; stigma obscurely 3-lobed; pseudopedicel formed by elongate perianth tube ± enlarged around ovary. Fruits capsular, beaked by persistent style base, dehiscence loculicidal. Seeds numerous, black, flattened, minutely cellularly reticulate.
Species within checklist: