We have 10 bushes of Korean Boxwood planted in a row along the E path in area F; the edge of that area is lined with a collection of boxwoods and different kinds of Japanese Holly (buxus ‘Green Pillow’, ‘Argentea’ and two different ilex crenata). The Korean boxwood is maintained at the height of 20′ and forms a low hedge; the plant has small glossy leaves with tiny indentation on the tip of each leaf.
From Oregon State University: Buxus microphylla var. koreana (syn. Buxus sinica var. insularis) Buxaceae
Korean Littleleaf Boxwood BUK-sus mi-kro-FIL-a
• Broadleaf evergreen shrub, upright, to about 2 ft (0.6 m) tall, greater width, somewhat open; young branches slightly pubescent. Leaves opposite, simple, ovate to oblong, 1-2 cm long, margin inrolled, entire, medium green, truning brown in winter.
• Sun to part shade. Very winter hardy.
• Hardy to USDA Zone 4
• The New Royal Horticultural Society Dictionary of Gardening (Huxley, 1992), lists three botanical varieties of Buxus microphylla, namely var. insularis, var. koreana (Korean Littleleaf Boxwood) and var. sinica. Others use a different classification, and cultivars that previously were placed under Buxus microphylla var. koreana are now sometimes listed under Buxus sinica var. insularis; e.g., ‘Winter Gem ’.
• microphylla: small-leaved.
From Missouri Botanical Garden: […] Noteworthy Characteristics: ‘Green Gem’ is a hybrid boxwood cultivar (Buxus microphylla var. koreana x Buxus sempervirens) that is noted for its globular shape and excellent winter hardiness. It is one of several cultivars in the Sheridan Green Series developed and introduced into commerce by Sheridan Nurseries of Ontario, Canada. It is a broadleaf evergreen shrub that typically grows in a dense globe to 2′ tall and as wide. Elliptic to oval, glossy dark green leaves hold their color well in winter. Flowers are inconspicuous. […]
From About.com.Landscaping: […] In planning for my boxwood hedge, I chose Korean boxwoods (Buxus microphylla ‘Koreana’), specifically, partly because they are hardier (to planting zone 4) than most. Even so, it is said that the leaves of Korean boxwoods turn bronzy in winter (in cold regions). I cannot vouch for this yet, because the leaves on mine stayed green during their first New England winter. […] I also chose Korean boxwoods for their look and growth habit. They’re a slow-growing, compact shrub (2′ tall x 3′-4′ wide at maturity, if left alone) amenable to pruning, and they bear the classic small, rounded boxwood leaf (microphylla means “small-leaf”). […]