Annual herb, 25-350 mm tall. Basal leaves rosulate, spathulate to elliptic, stem leaves filiform to linear-lanceolate. Flowers 1-3, terminal or axillary, pedicels very slender, 4-38 mm long. Calyx lobes 4. Corolla tube 1.2-3.6 mm long, somewhat hairy at throat. Flowers white to pale purple.