Reproductive isolation from a cross between a horse and a donkey or between a mare and a donkey, respectively. These animals are nearly always sterile due to the difference in the number of chromosomes between the two parent species. Both horses and donkeys belong to the genus "Equus", but "Equus caballus" has 64 chromosomes, while "Equus asinus" only has 62. A cross will produce offspring (mule or hinny) with 63 chromosomes, that will not form pairs, which means that they do not divide in a balanced manner during meiosis. In the wild, the horses and donkeys ignore each other and do not
Agapanthus africanus Agapanthus africanus Agapanthus africanus (African lily) is a flowering plant from the genus "Agapanthus" native to the area of Cape of Good Hope in South Africa. "A. africanus" is more difficult to grow in gardens than "A. praecox", and almost all plants sold as "A. africanus" are actually "A. praecox". It has a short stem bearing a tuft of long, narrow, arching leaves 10–35 cm long and 1–2 cm broad, and a central flower stalk 25–60 cm tall, ending in an umbel of 20-30 white, or bright blue, funnel-shaped flowers, each flower 2.5–5 cm diameter. It was introduced to Europe