Viola wailenalenae is a terrestrial or epiphytic, erect, usually unbranched subshrub reaching heights of 10–50 cm, and is glabrous throughout. The leaves are simple and alternate, clustered toward the ends of the branches. The blades are elliptic–ovate, slightly fleshy, measuring 8–18 cm long and 3.5–6 cm wide. The apex is short-acuminate to subacute, and the base is broadly cuneate or occasionally subtruncate. Both surfaces are glabrous. The margins are closely callose–serrulate with incurved teeth, and they are also fimbriate, with teeth measuring approximately 1–3 mm long. The petioles are 1.5–3.5 cm long. Stipules are thin, deltate, and measure 15–27 mm long and 5–6.7 mm wide. The flowers are axillary, apparently all chasmogamous, with 1–2 flowers per peduncle. The peduncles are 10–17 mm long, while the pedicels range from 20–50 mm long, with bracteoles slightly above the middle. Flowers are bisexual (perfect). The calyx consists of five sepals that are narrowly lanceolate to oblong–lanceolate, with the upper sepal measuring approximately 6–8 mm long, the lateral sepals 7.5–8.6 mm long, and the lower sepals 7–9 mm long, slightly prolonged at the base. The corolla consists of five white petals; the upper petals measure 7–11.5 mm long, the lateral petals 8–14 mm long, and the lower petals 10–15 mm long. It has five stamens, measuring 4.6–5 mm long, with the connective of the lower stamens prolonged into a nose-shaped structure about 1.3 mm long. The anthers are dithecal, opening by longitudinal slits. The ovary is superior, 3-carpellate, and 1-celled, with numerous ovules per placenta and parietal placentation. The ovules are anatropous, and the style is singular. The fruit is a capsule measuring approximately 13–15 mm long. The seeds are numerous, obovoid, about 1.8–1.9 mm long and 1.2 mm in diameter, with a fleshy, oily endosperm. It is found in wet forests and bog hummocks between 1,220–1,410 meters.