An unrecorded cactus species, Opuntia monacantha Haw. (Cactaceae), is newly reported in Korea. It was found growing on the coast of Jeju Island. It is distinguished from other Opuntia species by the following morphological characteristics. It is an erect succulent tree, commonly 2~3 m, but can reach 4 m. It is highly branched at the top and has drooping upper branches. The cladodes are oval to obovate, narrowing basally, and glossy green. It has yellow outer tepals with a reddish median stripe on the back. It produces purple fruit with yellowish green juicy pulp, which contains several rudimentary seeds and very few mature seeds (<2). The Korean name “Wang-seon-in-jang” is given to the species, based on the height of the plants and the large cladodes.

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 References

• 고석찬(제주대학교 생물학과) | Seok Chan Koh 교신저자
• 김제국(제주백년초박물관) | Je Kook Kim
• 김문홍(제주대학교 생물학과) | Moon Hong Kim