Tradescantia occidentalis (Britton) Smyth
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Stem slender, straight, often branched, 2–6 dm at anthesis, glabrous and glaucous; lvs firm, glabrous, involute, usually narrowly linear and under 1 cm wide; bracts like the lvs; cymes solitary and terminal, or with another one peduncled from an upper node; pedicels and sep sparsely pubescent with glandular hairs 0.5 mm; sep acute to acuminate, 6–10 mm; pet rose to blue, 12–16 mm; 2n=12, 24. Dry prairies and plains; w. Wis. and Minn. to La., w. to Mont., Utah, and Tex.