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'Viburnum atrocyaneum' from the website Trees and Shrubs Online (treesandshrubsonline.
Bean treated this species separately under the synonyms Viburnum atrocyaneum and V. calvum. Since the descriptions are based on material of diverse provenance, reflecting variation of potential horticultural interest, we reproduce below the text of both entries.
Viburnum calvum Rehder: Leaves shortly stalked, narrowly ovate to rhombic-elliptic, to about 3 in. long and 13⁄4 in. wide, entire or with a few callous teeth, glabrous, glossy, veins five to eight on each side, deeply impressed above. Flowers white or cream-coloured, in rounded terminal corymbs about 3 in. wide, on peduncles 1 to 13⁄4 in. long. Fruits blue-black, about 1⁄4 in. long.
Viburnum atrocyaneum C.B.Clarke: Leaves oblong, entire or indistinctly toothed, pinnately veined, about 3 in. long. Inflorescence almost sessile. Fruits about 3⁄16 in. long, hard, dark blue with a metallic lustre.
Viburnum calvum: A native of southwest China, described from a specimen collected by Henry in southern Yunnan; introduced by Forrest. It has long been grown at Exbury and has been distributed under its synonymous name. It is the probable pollen-parent of ‘Jermyns Globe’ (see under V. davidii).
Viburnum atrocyaeum: Described from a specimen collected by Griffith in the Mishmi Hills of Assam. Most plants in cultivation derive from Kingdon Ward’s 9198, collected in 1931 a short distance farther east, in the Adung valley of northwest Burma. He wrote in his field note: ‘Berries small, steely blue, with a curious lustre, giving an effect of lalique. The winter contrast of red stems, dark green leaves, and bunches of gleaming opalescent fruits is charming. Found up to 7,000 ft, usually on open cliffs and ridges in full sun.’