Buddleja sphaerocalyx is a species of flowering plant endemic to Madagascar. It grows in moist forests, principally along river banks, at altitudes of 300 – 2,200 m. The species was named and described in 1887 by Baker.
B. sphaerocalyx is a sarmentose shrub 2 – 3 m in height, the branchlets obscurely quadrangular, bearing opposite, connate-perfoliate leaves, 10 – 21 cm long by 3.0 – 11 cm wide, narrowly ovate, acuminate at the apex, and narrowing abruptly at the base; the margins irregularly crenate - dentate. The white inflorescences comprise solitary axillary flowers 4 – 10 cm long by 1.5 – 6 cm wide; the corollas 8.5 – 20 mm long.
B. sphaerocalyx is not known to be in cultivation.
- Leeuwenberg, A. J. M. (1979). The Loganiceae of Africa XVIII - Buddleja LII, Revision of the African & Asiatic species. H. Veenman & Zonen B. V., Wageningen, Nederland. 79 - 6 (1979).
- Baker, J. G. Journ. Linn. Soc. 22: 505. 1887