There is no such breed as "buttercup". With plants, or in botany, it has an actual meaning. With pets, it is simply used to show affection. That is why in the link it is named a "popular breed." Note that in one of the other so-called breeds, the word "munchkins" comes up. Both "buttercup" and "munchkins" are terms of endearment and really mean nothing as far as breeds of anmals are concerned.
Here is a copy of the actual denotative meanings of "buttercup":
buttercup
Dictionary:
buttercup
(bŭt'ər-kŭp') pronunciation
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Home > Library > Literature & Language > Dictionary
n.
Any of numerous herbs of the genus Ranunculus, native chiefly to temperate and cold regions and having acrid juice, often toothed or lobed leaves, and usually yellow or white flowers with numerous pistils.
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Britannica Concise Encyclopedia: buttercup
Home > Library > Miscellaneous > Britannica Concise Encyclopedia
Aquatic buttercup (Ranunculus flabellaris)
(click to enlarge)
Aquatic buttercup (Ranunculus flabellaris) (credit: (Top) Kitty Kohout from Root Resources, (bottom) Frances V. Davis)
Any of about 250 species of herbaceous flowering plants constituting the genus Ranunculus of the family Ranunculaceae. Buttercups are especially common in the woods and fields of the northern temperate zone. The turban, or Persian buttercup (R. asiaticus), is the florist's ranunculus. Among the many wild species are the tall meadow buttercup (R. acris) and common water crowfoot (R. aquatilis). Other members of the family Ranunculaceae are widely distributed in all temperate and subtropical regions. In the tropics they occur mostly at high elevations. Their leaves are usually alternate and stalkless and may be simple or much divided. The flowers may be radially symmetrical or irregular. The family includes such flowers as anemone, larkspur, marsh marigold, clematis, and hepatica (genus Hepatica).
For more information on buttercup, visit Britannica.com.
Columbia Encyclopedia: buttercup
Home > Library > Miscellaneous > Columbia Encyclopedia
or crowfoot, common name for the Ranunculaceae, a family of chiefly annual or perennial herbs of cool regions of the Northern Hemisphere. Thought to be one of the most primitive families of dicotyledenous plants, the Ranunculaceae typically have a simple flower structure in which each flower part may be separate rather than fused into a single organ (see flower). Many buttercups are aquatic plants, hence the Latin name for the genus Ranunculus [little frog]. The family includes numerous familiar wildflowers and many cultivated ornamentals. Well-known representatives are the aconite, anemone, baneberry, bugbane, clematis (one of the few vine genera), columbine, globeflower, hellebore, hepatica, larkspur, love-in-a-mist, marsh marigold (the American cowslip), meadow rue, and peony. The largest genus, Ranunculus, comprises the buttercups and crowfoots, names often used interchangeably. Found throughout arctic, north temperate, and alpine regions, with species in the Andes and in subantarctic areas, this genus is characterized by glossy yellow flowers (hence the name buttercup) and deeply cut leaves (supposedly resembling crows' feet). Like some other members of the family, species of this genus contain an acrid juice that makes them unpalatable for livestock and in some species poisonous. A dozen or more species are common in every part of the United States. Among those cultivated for garden and cut flowers are some double-blossomed Old World species, e.g., the turban, or Persian, buttercup (R. asiaticus), valued for the variety of its colors (all but blue), and the creeping buttercup (R. repens), native to both North America and Europe. R. ficaria, of Eurasia, is the lesser celandine—a name more commonly applied to some plants of the poppy family, which it resembles. The buttercup family is classified in the division Magnoliophyta, class Magnoliopsida, order Ranunculales.
Wikipedia: Buttercup (disambiguation)
Home > Library > Miscellaneous > Wikipedia
Buttercup has several definitions, including:
* Buttercup, any of several species of flowering plant belonging to the genus Ranunculus or their flowers.
* Buttercup, one of the Powerpuff Girls.
* Buttercup, female protagonist of The Princess Bride.
* Buttercup, a character in the Gilbert and Sullivan opera, HMS Pinafore.
* Buttercup, a cough medicine brand
* Buttercup, a type of pumpkin found in New Zealand.
* Buttercup, a breed of chicken originally from Italy.
* Buttercup squash, the common name of the winter squash species Cucurbita maxima.
Other uses
* (Build me up) Buttercup, a song by the Foundations
Disambiguation notice This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.
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Translations: Translations for: Buttercup
Home > Library > Literature & Language > Translations
Dansk (Danish)
n. - smørblomst, ranunkel
Nederlands (Dutch)
boterbloem
Français (French)
n. - (Bot) bouton d'or, renoncule des champs
Deutsch (German)
n. - Butterblume
Ελληνική (Greek)
n. - (φυτολ.) νεραγκούλα, ανδελόχορτο
Italiano (Italian)
ranuncolo
Português (Portuguese)
n. - botão-de-ouro (m) (Bot.)
Русский (Russian)
лютик
Español (Spanish)
n. - ranúnculo, botón de oro
Svenska (Swedish)
n. - maskros, smörblomma
中文（简体） (Chinese (Simplified))
毛茛, 金凤花
中文（繁體） (Chinese (Traditional))
n. - 毛茛, 金鳳花
한국어 (Korean)
n. - 미나리아재비
日本語 (Japanese)
n. - ウマノアシガタ
العربيه (Arabic)
(الاسم) نبات مزهر
עברית (Hebrew)
n. - נורית (פרח)
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The translation workplace 
peer agreement (net): +5