Nerteragrandensis, also known as moss coral, monstrum or Grenada thin column grass, is a dwarf evergreen herb of the genus Rubiaceae and thin column grass, which is clustered; the stems are prostrate, the leaves are densely opposite, and the nodes often take root ; Leaves are broadly ovate, 4-8mm long, light green, slightly fleshy; bell-shaped, very small, green flowers, about 3mm in diameter, without pedicels; dense and numerous small berries, bright orange-red, 0.5 in diameter ~0.6 cm; the flowering period is from April to June, and the fruiting period can last for several months until autumn and winter.