Senna gaudichaudii (Hook. & Arn.) H. S. Irwin & Barneby

Perennial, Shrubs, Woody throughout, Stems woody below, or from woody crown or caudex, Stems erect or ascending, Stems or branches arching, spreading or decumbent, Stems less than 1 m tall, Stems 1-2 m tall, Stems greater than 2 m tall, Stems solid, Stems or young twigs sparsely to densely hairy, Leaves alternate, Leaves petiolate, Extrafloral nectary glands on petiole, Stipules inconspicuous, absent, or caducous, Stipules green, triangulate to lanceolate or foliaceous, Stipules setiform, subulate or acicular, Stipules deciduous, Stipules free, Leaves compound, Leaves even pinnate, Leaf or leaflet margins entire, Leaflets opposite, Leaflets 5-9, Leaflets 10-many, Leaves hairy on one or both surfaces, In florescences racemes, Inflorescence axillary, Bracts conspicuously present, Flowers actinomorphic or somewhat irregular, Calyx 5-lobed, Calyx glabrous, Calyx hairy, Petals separate, Petals greenish yellow, Stamens 9-10, Stamens heteromorphic, graded in size, Stamens completely free, separate, Filaments glabrous, Anthers opening by basal or terminal pores or slits, Style terete, Fruit a legume, Fruit stipitate, Fruit unilocular, Fruit tardily or weakly dehiscent, Fruit indehiscent, Fruit elongate, straight, Fruit oblong or ellipsoidal, Fruit exserted from calyx, Fruit internally septate between the seeds, Fruit compressed between seeds, Fruit glabrous or glabrate, Fruit 11-many seeded, Seed with elliptical line or depression, pleurogram, Seeds ovoid to rounded in outline, Seed surface smooth, Seeds olive, brown, or black.

Senna gaudichaudii, known as Gaudichaud's senna and as heuhiuhi in Hawaiian, is a species of flowering plant in the legume family, Fabaceae, that is endemic to Queensland, Australia and the Pacific Islands. It is a shrub, reaching a height of 0.5–4 m (1.6–13.1 ft). In Hawaii, heuhiuhi inhabits low shrublands, dry forests, coastal mesic forests and mixed mesic forests at elevations of 5–920 m (16–3,018 ft) on most main islands.

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