ACERAS (from a, without, and keras, a horn; the lip having no spur). ORD. Orchideae. An interesting genus of terrestrial orchids. Calyx of three ovate, equal, converging sepals; petals two, narrow, oblong; lip spurless, much longer than the calyx, narrow, oblong, with four linear lobes. The most interesting species is the native one. Indigenous to dry, chalky pastures in the south-east of England, and it will only thrive in similar soils when grown in gardens. Propagated by careful divisions of tubers only. ACERAS anthropophora (man-bearing). Green Man Orchis. fl. greenish, on a long spike; lip longer than the ovary; lip and petals often margined with red. June. l. lanceolate. h. 1ft.