Perennial herb to about 60 cm. Leaves several, basal, linear. Inflorescence severalflowered. Flowers bell-shaped, erect to spreading; summer.Tepals to 18 mm long, purple or white. Stamens 3; sterile stamens 3. Fruit many-seeded.

Utah and California to Oregon

 

D. congestum (Sm.) Kunth, Forktooth Ookow, from California to Oregon is a perennial herb to about 90 cm. Leaves several, basal, linear. Inflorescence severalflowered. Flowers short tubular, erect to spreading; summer.Tepals to 20 mm long, purple. Stamens 3, sterile stamens 3, bifid. Fruit many-seeded.

D. pulchellum (Salisb.) Heller, Blue Dicks, from California to Oregon is a perennial herb to about 90 cm. Leaves several, basal, linear. Inflorescence many-flowered. Flowers short tubular, erect to spreading; summer. Tepals to 20 mm long, purple. Stamens 3+3, united, stamen tube with bifid appendages. Fruit many-seeded.

Source: Conran, J. (2005). Themidaceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 5. Flowering plants. Monocotyledons. The identification of garden and cultivated plants. University of New South Wales Press.