Perennial, rhizome slender, 1-2 mm. diam., branching and interlacing; stems glab., 15-20 cm. long, including the tall peduncles, decumbent at base then spreading and ascending, branching. Lvs alt. or subopp., or rosulate in young stems and young lateral branches, uniform, thin, membr., glab., obovate- to elliptic-spathulate, cuneately narrowed to a slender flat petiole; c. 3 cm. (including petiole) × 5-6 mm. Margins shallowly serrate in broad part, lamina flat or nearly so. Peduncles solitary from the top of each stem and branch, up to 15 cm. tall, erect or ascending, nude or with 1 or few oblanceolate or linear sessile lvs, simple or branched. Fls 1 to several per peduncle, erect or inclined, drooping in bud. Calyx glab., lobes narrow-acuminate, erect in bud, spreading or recurved in fl., 4-5 × 1 mm., with 1 or 2 small serratures on each side. Corolla always creamy white, c. 15 × 20 mm., with deeply campanulate tube and 5 rotately-spreading ovate apiculate lobes = tube. Style = corolla-tube. Staminal filaments oblong at base with edges recurved and hairy. Capsule glab., broad-cylindric, c. 6 × 4 mm.

2n = 36

Similar to subsp. albomarginata, but with prostrate leaves ovate to orbicular-spathulate, sometimes tufted along the elongating ascending stems in shade forms. Usually entire-margined, except in deep shade when they may become dentate. Flowers larger than W. albomarginata, creamywhite to bluish white, 18—25 mm diam. in life. Calyx lobes toothed and recurved in ripe capsules in Simpson's specimens (Fig. 22).