Monographs Details: Evolvulus nuttallianus Roem. & Schult.
Authority: Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Description:Species Description - Erect or ascending, 1–2 dm, densely hairy, lvs crowded, ascending, lanceolate or narrowly oblong, 1–2 cm; fls solitary in the axils, sessile or on pedicels shorter than the narrowly lanceolate, villous sep; cor blue, broadly funnelform, 1 cm wide, its margin nearly entire; pedicels deflexed in fr; fr ovoid, 1–2-seeded. Dry prairies and barrens; N.D. to Mont., s. to Mo., Tenn., Tex., and Ariz. May, June. (E. argenteus Pursh, not R. Br.; E. pilosus)