Evolvulus nuttallianus
Syst. Veg. 6: 198. 1820.
Subshrubs; herbage hairy, hairs spreading. Stems ascending to erect, 10–15+ cm, internodes rarely 4+ mm. Leaves pentastichous, distals ± antrorse; blade usually elliptic, sometimes linear-oblong or narrowly lanceolate to oblanceolate, rarely oblong, 8–20 × 1.5–5 mm, surfaces densely hairy. Inflorescences: flowers solitary; peduncles plus pedicels stout, 1–2(–4) mm. Flowers: sepals lanceolate to narrowly lanceolate, 4–5 mm; corolla blue, purple, or lavender, rotate to broadly campanulate, limb 8–12 mm diam., margins subentire.
Phenology: Flowering Apr–Oct.
Habitat: Oak woodlands, ponderosa pine zones, sandy, rocky prairies, plains, juniper-pinyon woodlands, chaparral.
Elevation: 200–2500 m.
Distribution
Ariz., Ark., Colo., Ill., Kans., Mo., Mont., Nebr., N.Mex., Okla., S.Dak., Tenn., Tex., Utah, Wyo., Mexico.
Discussion
R. H. Mohlenbrock (1986) reported Evolvulus nuttallianus as established in Kane County, Illinois. Reports of it being established in North Dakota have not been confirmed.
The name Evolvulus pilosus of Nuttall (not validly published) pertains here.
Selected References
None.