While alien plants have been well-publicised, Alien & Invasive Animals, by Mike Picker and Charles Griffiths is the first book to be published on alien animals in Africa. With a list more than 300 invasive animals that have settled in South Africa, this book describes the history of each invasion, and the ecological and economic impacts in South Africa; and it discusses the effect of introduced biocontrol agents (usually insects), which are also alien species released deliberately to control problem plants.
Australian water clover is an aquatic water clover. It has reddish-brown stripes that split the darker green on the top half of the leaflets and the lighter green of the lower half. It reaches 4 to 12cm tall, spreads, and will grow in sun or shade. It also will grow in damp soil. It is very cold hardy - it will take temperatures below 15 degrees Celsius.
Cabomba caroliniana is a rooted perennial aquatic plant, which grows submerged with branching stems reaching 2m or longer. It has feathery green leaves, which are divided into narrow segments.
A submerged aquatic plant with slender stems up to 3m long. Green, finely serrated leaves 15-30mm long in whorls of 4-5, sometimes 3-8. Yellow or cream flowers appear on long stalks about 20mm above the water surface. This aquatic plant invades still or slow-moving water in lakes and ponds.