Jedni podają, że bosc pear jest oodmianą europejskiej gruszy (Pyrus communis) czyli gruszy pospolitej, dzikiej, ulęgałki uprawianą w stanach Kalifornia, Waszyngton i Oregon.
Inni, że ojcem tej odmiany jest, a raczej był pan Bosc z Belgii.
Wg mnie wygląda jak miodówka.
Źródła, w których występuje zgodność co do różnego nazewnictwa tej odmiany. Polskie
Beurré Bosc, Beurré d'Apremont, Kaiser Alexander, Imperatore
Asselandro, Kaiserkrone, Alexanderbrine, Empereur Alexandre
jab∏ek i ...... Beurré Bosc, Beurré d'Apremont, Kaiser Alexander, ...
www.ijhar-s.gov.pl/download/Jablka i gruszki screen.pdf
i amerykańskie:
Bosc, however, are known in various parts of the world by several names. Buerré Bosc identifies the fruit as "buttery" and named after M. Bosc who was the director of the Paris Botanical Garden. Calabasse Bosc is another name, and references the fruit as "gourd-shaped". Then there is the name Buerré d'Appremont, where the variety is named for a French town.

Some believe that Buerré Bosc was first raised from a seed about 1807 in Belgium by Mr. M. Bosc. Others contend that Buerré d'Appremont were discovered about 1830 as a very old seedling tree in the city of Appremont, France.
Today, Bosc are also called Kaiser Alexander in some countries.
Here in the United States, the history of Bosc Pears is more certain. Thevariety was first planted in 1832 or 1833, and those trees first bore fruit in 1836. The first plantings were done in the eastern U.S., on large estate orchards and later commercial orchards. Now, Bosc are grown largely in the Northwest, as the trees were found to thrive bestin the soil and climate of Oregon and Washington states.
http://www.usapears.com/pears/varieties_bosc.asp