K. hospita is an evergreen, bushy tree growing up to 20 m high, with a dense rounded crown and upright pink sprays of flowers and fruits. Leaves are simple and alternate; stipules are ensiform to linear, about 8 mm long; petioles are 2.5–30 cm long; the leaf-blade is ovate to heart-shaped, glabrous on both sides, with the apex pointed. Secondary veins occur in 6-8 pairs, palmately nerved.
The flowers of K. hospita are terminal, in loose panicles protruding from the crown; flowers are about 5 mm wide, coloured pale pink; pedicels are 2–10 mm long; bracteoles are lanceolate, 2–4 mm long, pubescent; gynandrophores are 4–7 mm long, pubescent; there are 5 sepals, linear lanceolate, 6–8 mm long, pink, tomentose; 5 petals, inconspicuous, the upper one being yellow; 15 stamens, monaldelphous, 8–15 mm long, staminal tube broadly campanulate, adanate to gynandrophore, 5-lobed, each lobe having 3 anthers and alternating with staminodes; the anthers are sessile and extrorse; pistil occur with a 5-celled, pilose ovary, one style and a capitate, with a 5-lobed stigma. K. hospita flowers throughout the year.
Fruit production starts early, often in the third year after planting. The fruit of K. hospita are rounded, 5-lobed, thin-walled, membranous capsules, 2-2.5 cm in diameter, loculicidally dehiscent, each locule having 1-2 seeds. The seeds are globose, whitish, warty and exalbuminous. The fruits are more conspicuous than the flowers because of their abundance and size.