Donkey
Donkeys can interbreed with other members of the family Equidae, and are commonly interbred with horses. The hybrid between a jack and a mare is a mule, valued as a working and riding animal in many countries. Some large donkey breeds such as the Asino di Martina Franca, the Baudet de Poitou and the Mammoth Jack are raised only for mule production. The hybrid between a stallion and a jenny is a hinny, and is less common. Like other inter-species hybrids, mules and hinnies are usually sterile. Donkeys can also breed with zebras in which the offspring is called a zonkey (among other names).
Erica
A number of increasingly detailed phylogenetic hypotheses for "Erica" have been published based on nuclear ribosomal and plastid DNA sequences. The closest relatives of "Erica" are "Daboecia" (one or two species) and "Calluna" (monospecific), representing the oldest surviving lineages of a, by inference, ancestrally Palearctic tribe Ericeae. The small number of European "Erica" species represent the oldest lineages of the genus, within which a single, order-of-magnitude more species-rich, African clade is nested. Within the African clade, Cape and Madagascan/Mascarene species respectively represent monophyletic groups.