Herbs, perennial, unbranched to usually sparsely branched. Roots tuberous. Stems erect to ascending. Leaves: blade linear to linear-lanceolate, 4--15 ´ 0.4--1 cm, apex acuminate, glabrous to puberulent. Inflorescences: distal cyme usually 1-flowered, exserted; spathes solitary, green, often suffused and/or striped with purple, pedunculate, falcate or not, 2.5--8 ´ 0.7--1.7 cm, margins distinct, scabrous, not ciliate, apex acuminate, glabrous to puberulent; peduncles 1.5--9.5 cm. Flowers bisexual and staminate; pedicels puberulent; petals dark blue, proximal petal somewhat smaller; staminodes 3; antherodes yellow, cruciform. Capsules 3-locular, 2-valved, 5--6 mm, apiculate. Seeds 5, brown, 2.2--2.7 ´ 1.7--2.2 mm, rugose, pitted.
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A herb. It keeps growing from year to year. It only has a few branches. The root are tuberous. The leaves are narrowly sword shaped and 4-15 cm long by 0.4-1 cm wide. They taper to the tip.
Rocky soils in Arizona, Colorado, New Mexico, Texas and Mexico.
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