|Smilax nipponica, a
perennial herb found in fields and mountains, stems standing erect
initially, then upper parts become vine-like and twine around.
Leaves are of alternate phyllotaxis, 4-20cm long, in the shape of an
oblong, with surfaces not glossy and thin texture. Tendrils emerge
from axils. Both male flowers and female flowers, 6-petalled,
yellow-green, set themselves in umbels that emerge from axils;
perianth lobes bend back not. Bloom time: May-June.