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Shrubs or small trees. Stipules distinctive for each species, sometimes splitting into 2 halves.  Inflorescence of terminal panicles, composed of small compact cymes, bracteoles small, lanceolate or oblong, often serrate, persistent. Flowers white, fragrant. Calyx small, glabrous or hirsute, tube ovate, urceolate or oblong, teeth (4-)5, erect, persistent. Corolla small, tubular, often widened upwards with (4-)5 spreading or reflexed lobes. Stamens inserted in the upper part of the corolla tube between the lobes, anthers oblong or elliptic, sessile and semi-included or on short filaments and shortly exserted between corolla lobes. Ovary 2-celled, ovules many, styles filiform, stigmas exserted, clavate. Fruits small capsules, crowned with persistent calyx teeth. Seeds numerous, small, angled.

Key to the species

Serial Key Reference
1a. Lateral leaf nerves more than 12 W. grandis
1b. Lateral leaf nerves up to 12 2
2a. Calyx segments hairy 3
2b. Calyx segments glabrous 5
3a. Calyx lobes rounded W. paniculata
3b. Calyx lobes triangular 4
4a. Leaves to 20 cm long (8-20 × 2-8 cm), sparingly hairy or pubescent below W. tinctoria
4b. Leaves more than 20 cm long (20-25 × 6-7cm), pubescent on both surfaces W. tinctoria ssp. orientalis
5a. Caly teeth rounded or triangular, tip blunt. Panicles compact with ascending branches W. heyneana
5b. Calyx teeth triangular, tip acute 6
6a. Flowers sessile, mostly in groups of 3. Panicles to 20 cm, branches decusste W. amocana
6b. Flowers subsessile or shortly stalked, usually single. Stipules pointed with kneeled tip W. glabrata