PLANT: Annual 3-35 cm tall, erect and simple to diffusely branching. LEAVES: subglabrous to sparsely woolly, entire or with 1-2 pairs of lobes near the base of the rachis, 1-3 cm long. CALYX: 6-7 mm long; corolla actinomorphic, narrowly funnelform to slightly zygomorphic, the throat white to yellow, the lobes white to pale blue or bluish lavender, the tube and throat 4-7 mm long, slightly longer than the calyx tube, the lobes 3-5 mm long; stamens inserted on the throat near the sinuses, less than the length of the corolla lobes; filaments slightly unequal in length; pistil 5-7 mm long; style included in the tube or throat. CAPSULE: 2-4 mm long. NOTES: Open sites, desert shrublands, sagebrush, pinyon-juniper woodland: Cochise, Gila, Graham, La Paz, Maricopa, Mohave, Pima, Pinal, Santa Cruz, Yavapai, Yuma cos; 700-5600 ft; Feb-Jun. s CA to w CO, s to n Mex. This species includes plants assigned to E. diffusum subsp. jonesii H. L. Mason, with corollas 10-12 mm long and anthers 0.7-1 mm long. The typical, more common subsp. diffusum usually has shorter corollas and anthers less than 0.8 mm long. These differences do not appear correlated with geographical or ecological distribution. REFERENCES: Dieter H. Wilken and J. Mark Porter, 2005, Vascular Plants of Arizona: Polemoniaceae. CANOTIA 1: 1-37.