That is a very obscure term they used. It is not really a pear variety but it is instead a group of pears. That is like referring to a car as a car but there is also a type of a car not just a group. Frequently nurseries use the term “sugar pear” to generically define all small sweet pears that are similar to seckle but encompass a much larger group. The group is all small and sugary tasting pears.
Sugar Pear Trees for Sale | Standard Select Pear Trees | Willis Orchards
" About Sugar Pear Tree
Grows in zones: 5 - 9
These Sugar Pear Trees for sale produce small round bell-shaped pears with ultra-sweet flavor. The skin is a smooth, yellow-brown with russet red blush. The flesh is a white creamy texture of superior quality. The Sugar Pear tree is semi-dwarf and self-fertile making it a perfect choice for people with limited space. The Sugar pear is good for fresh eating or preserving and ripens in mid to late August. (200-300 Chill Hours)
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"Grows just 10-12 ft. tall
Very sweet, creamy white flesh
Requires 300 chill hours
Very sweet flavor. Sugar Pearl is a natural semi-dwarf, maturing at 10-12 ft. Good textured, creamy white flesh. Medium to small, round to bell-shaped fruit. Skin is yellow-brown, suffused with russet red. Good for mild winter areas but will fruit heavier with more chill hours. Cold hardy zone 7. (300 chill hours required) Harvest mid to late August. Eat or process right off the tree, no cold storage required.
SKU: 79057
$29.99
For each offer ordered, get 1 Semi-Dwarf 2-4’ tree
Grows in zones: 7-9
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https://plants.ces.ncsu.edu/plants/pyrus-communis-seckel/
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Pyrus communis ‘Seckel’
Common Name(s):
Phonetic Spelling
PY-russ kom-YOO-nis KOM-yoo-nis
Description
This easy-grown tree is very productive. It is cold-hardy and frost resistant. It also resists to Fire Blight and some other common pear diseases. Needs at least two cultivars to ensure adequate pollinating.
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Usually what happened was a pear was called sucre or sugar to indicate it was sweet. These are not a pear called sucre.
It is like when speaking Chinese we dont realize Li means pear. When we speak of pears we say we have ya li , pai li, tsu li etc…We are effectively saying pear pear. In English i call a pear ya li because people dont know what i mean if i say ya. If i say li the chinese know im saying the generic term pear. In French Beurre is a group of pears that are buttery. " Inherited from Middle French beurre (16th c.), from a regional (eastern or western) variant of burre , from Old French burre , bure , from Latin būtȳrum , from Ancient Greek βούτῡρον (boútūron, “butter”, literally “cow-cheese”)." beurre - Wiktionary
Beurre Bosc or Beurre D’Anjou are only 2 members of the butter pear group Beurre D'Anjou and Beurre Bosc
Literally to look up Beurre would be to find 20+ varieties in that group. . NCGR-Corvallis: Pyrus Catalog