佛甲草（学名：Sedum lineare，英文名称：Buddhanail、Linear Stonecrop），为景天科景天属植物。本种的模式标本采自于日本 。

佛甲草（在日本被称为万年草）有诸多异称，如（按笔画排列）：土三七、小佛指甲、小马齿菜、小叶刀焮草、山马齿菜、午时花、半支连、半支莲、打不死、瓜只玉、禾雀舌、禾雀利、禾雀脷、尖叶六儿令、尖叶石指甲、伸甲草、佛甲菜、佛指甲、垂盆草、狗牙半枝、狗牙半枝莲、狗牙菜、狗牙齿、狗牙办、狗牙瓣、肩痈草、金刺插、金莿插、金枪药、指甲草、窄叶小六儿令、细叶打不死、野马齿菜、麻雀舌、麻雀花、万年草、鼠牙半支、鼠牙半支莲、鼠牙半枝莲、图经草、还魂草、龙牙草、铁指甲等。

Sedum lineare also known as carpet sedum, needle stonecrop or sea urchin, is a sedum originating in East Asia.

It has been proposed as an ideal plant for the "greening" of flat-roofed buildings in Shanghai, China, due to factors such as its ability to tolerate cold and drought, little need for soil and its roots' lack of penetrating ability,