Cassinopsis is a genus of Afrotropical plants, generally placed in the family Icacinaceae. They are lanky, evergreen shrubs or small trees that favour well-watered areas. They may carry spines and the leaves have an opposite arrangement. The genus name suggests its resemblance to the genus Cassine.

Cassinopsis ilicifolia commonly known as the lemon thorn in English and lemoendoring or lemoentjiedoring in Afrikaans is an evergreen, scrambling flowering shrub that can grow up to four meters high and four meters wide. The bright, glossy, green foliage, orange fruits and the drooping habit of the stems make this a very attractive plant which can be utilised as a specimen plant in the middle of a lawn or in a small townhouse garden. The plant can also be trained to form a neat compact hedge. It can effectively be used as a decorative outdoor pot plant. It does not have an aggressive root system and can be used close to paved areas, buildings and other structures without causing any damage. The lemon thorn is often utilised in shrubberies and on the borders of gardens and forests. Its dense growth habit makes it an ideal plant to use as a screen (e.g. to screen wind, provide privacy, screen objectionable views). It can also be used to direct traffic when planted on either side of a pathway or drive. Due to the sharp spines and dense growth habit this plant would make an excellent security barrier or hedge to keep unwanted people or animals out of a particular area. The leaves of this plant are eaten by game such as kudu, klipspringer, and grey and blue duiker and are also utilised by goats and cattle. The fruits are eaten by many bird species such as bulbuls, starlings, barbets, pigeons, guineafowl and francolins. The ripe fruit are edible but do not always have a good taste or flavour. The bark of this plant is used medicinally by some Zulu people for treating dysentery.