Peristrophe roxburghiana (syn. Peristrophe tinctoria Nees, Peristrophe baphica (Spreng) Bremek.; also called magenta plant, or lá cẩm in Vietnamese) is a flowering plant in the family Acanthaceae, native to southeastern Asia from Assam south to Sri Lanka and east to mainland Southeast Asia, Java, southern China, and Taiwan.[1][2][3]

It is a herbaceous perennial plant growing to 50–100 cm tall. The leaves are lanceolate to ovoid-acute, 2–7.5 cm long and 1–3.5 cm wide. The flowers are two-lobed, the long axis up to 5 cm long; they are magenta to reddish-violet.[1][2][4][5]

An extract of its leaves imparts a magenta tone to some Vietnamese foods, particularly in a taro-filled cake called bánh da lợn and glutinous rice dishes such as xôi lá cẩm, a sweet dessert.