Ascocentrum miniatum is native to Thailand, Laos, Vietnam, Malaysia, Java and Philippines. In Thailand, these orchids meet all over the country, from the northern mountainous areas up to the southwestern peninsula. They grow usually in dry deciduous forests at heights of 200-760 m, but they were met in the northwestern mountains at heights of 300-1000 m, and near Loei, in the northeast, at an altitude of 610 m. In Malaysia, plants are found on the island of Langkawi near the north-west coast and in the northwestern state of Peris. In the Philippines, they grow at heights of 180-750 m on the island of Luzon in the province of Rizal, and on the island of Mindanao in the provinces of Agusan, Davao, Cotobato and Lanao. In Java, these orchids are quite common throughout the island, and grow at altitudes from sea level to about 1200 m.
It is a miniature monopodial with a thick straight stem covers the bases of two-rowed leaves. The leaves are straight or slightly curved with 5-20 cm long and 1.0-1.5 cm wide. They are rigid, dark green, thick, fleshy, striped, V-shaped cross section and a serrated, uneven spike, two-rowed in the upper part of the shoot and spaced 0.3-0.4 cm apart.