This adventive annual plant is about 3-10' long, branching occasionally toward the base. Smaller plants in sunlight are more or less erect, while larger plants in shade have a tendency to sprawl across the ground. The stems are light green and hairy. The alternate leaves are up to 1' long and 1/3' across; they are oblong to oblong-lanceolate, medium green, sessile, and hairy. The leaf margins are smooth and ciliate. The upper stems terminate in elongated racemes of flowers; the raceme of the central stem eventually occupies over one-half the length of the plant. Each flower is about 1/8' across and ¼' long, consisting of a 5-lobed blue corolla, a hairy green calyx with 5 linear-lanceolate teeth, a 4-celled pistil with a single style, and 5 stamens. The hairy pedicels are shorter than the flowers (about 1/8' in length). The corolla has a small cup-like or funnel shape and it lacks a yellow center. The blooming period occurs from late-spring into the summer and can last several months. Each flower is replaced by 4 small nutlets. This plant spreads by reseeding itself. It can form loose colonies of plants in open areas.