Phyllostegia velutina, of the Lamiaceae (mint) family, is a climbing vine with square stems and dense, backward-pointing hairs on the leaves. The hairs are silky on the opposite, narrow, toothed leaves, which are 9.2 to 17.5 cm (3.6 to 6.9 in) long and 2.5 to 5 cm (1 to 2 in) wide. Six to 10...