Sarcococca hookeriana

Sarcococca hookeriana, the Himalayan sweet box, is a species of flowering plant in the box family Buxaceae, native to China, Afghanistan, North East India, Bhutan and Nepal. It is a low-growing evergreen shrub or groundcover, usually between 12 and 24 inches high. It produces aromatic white flowers throughout winter, followed by black berries.
"Sarcococca hookeriana" has several varieties of very different appearance to which different nomenclature has been applied in the references. Recent convention for example is to use "Sarcococca hookeriana" var. "humilis" for the previous "Sarcococca humilis", although it has broader, shiny leaves and a different habit than other forms.
The variety "Sarcococca hookeriana" var. "digyna" is more slender with narrower leaves. The cultivar ‘Purple Stem’ has gained the Royal Horticultural Society's Award of Garden Merit. It is fully hardy down to , but requires a sheltered position in full or partial shade. 
Etymology.
The Latin specific epithet "hookeriana" refers to the British botanist and explorer Sir Joseph D. Hooker.
"Digyna" is derived from Greek and means 'having an ovary with two carpels'.