Carolina, or yellow, jasmine, or jessamine (Gelsemium sempervirens), an ornamental evergreen vine, bears fragrant clusters of yellow flowers that are pinkish orange behind the petal lobes. Several species of butterfly bush (q.v.; Buddleia) and pinkroot (Spigelia marilandica) also are cultivated as ornamentals. Poisonous alkaloids found in the bark and seeds of plants of the genus Strychnos are used in arrow poisons such as curare (q.v.) and in drugs that stimulate the heart and central nervous system. Buddleia is now considered by many botanists to belong to the family Buddlejaceae, and Spigelia and Strychnos occasionally are placed in the families Spigeliaceae and Strychnaceae respectively.