Ophiopogon, commonly known as lilyturf or mondo grass, is a genus of evergreen perennial plants in the family Asparagaceae (subfamily Convallarioideae, order Asparagales). Despite their striking resemblance to grasses, these plants are not closely related to the true grasses of the family Poaceae; they are instead monocots more closely allied to asparagus, hostas, and lily of the valley. The genus was formerly placed in the Liliaceae, as was common for many lilioid monocots before molecular phylogenetics reorganized the order.
Plants grow from short rhizomes, producing dense tufts of narrow, arching, grass-like leaves. Flowers are borne in racemes on short stems that rise just above the foliage, giving the clumping mounds a delicate, understated flowering season. The fruits are typically fleshy and berry-like, often in shades of blue or black at maturity.
Ophiopogon is native to the warm temperate to tropical regions of East, Southeast, and South Asia, with its center of diversity in China and Japan. Several species, notably O. japonicus and O. planiscapus, are widely cultivated as ground-cover plants valued for their dense, low-maintenance foliage and tolerance of shade. The cultivar O. planiscapus 'Nigrescens' is particularly well known for its near-black strap-like leaves and is widely grown as an ornamental. Beyond horticulture, O. japonicus has a long history of use in traditional Chinese medicine, where its tuberous roots, known as mai men dong, are considered the cardinal herb for yin deficiency.
Etymology
The genus name Ophiopogon is derived from the Greek words ὄφις (ophis, "snake") and πώγων (pogon, "beard"), most probably an allusion to the plant's long, narrow leaves and its dense, tufted habit of growth.
Distribution
Ophiopogon is native to warm temperate to tropical East, Southeast, and South Asia, with the greatest diversity of species found in China, Japan, and adjacent regions of the Asian continent.
Cultivation
Several species are cultivated as ground-cover plants, particularly O. japonicus (mondo grass) and O. planiscapus, which are valued for their dense, low-growing foliage and tolerance of shade. They are typically grown in moist, humus-rich soil and require little maintenance once established.
Cultural Uses
In traditional Chinese medicine, the dried tuberous roots of O. japonicus — known as mai men dong — are considered the cardinal herb for treating yin deficiency. The herb is described in the Chinese Materia Medica as sweet, slightly bitter, and slightly cold; it is said to enter the heart, lung, and stomach channels, nourish the yin, and clear heat. It is used in the treatment of dry coughs, dry mouth and tongue, and constipation.
Taxonomy Notes
Ophiopogon was historically classified in the Liliaceae, in line with many lilioid monocots. Under the APG III classification system, it was moved to the family Asparagaceae, subfamily Convallarioideae — the subfamily was itself previously recognised as the separate family Ruscaceae. GBIF recognises the genus within the order Asparagales, class Liliopsida.
