Megistostegium microphyllum grows as a shrub up to 4 metres (13 ft) tall.

They are coloured gray-green to bright green and measure up to 1.8 cm (1 in) long.

[2] Megistostegium microphyllum is found at numerous locations throughout southern Madagascar, including in protected areas.

[1] Threats to Megistostegium in general include grazing by goats, invasive plants competing for limited water supplies and the possible extinction of pollinators.

[2] The bark, leaves and twigs of M. microphyllum are locally used to treat conditions including eye ailments and stomach aches.