Question: Do the Trailing bellflower and the Pseudocydonia sinensis belong to the same plant family?

Context articles: Aviculin
Campanula portenschlagiana
Karin (given name)
Campanula piperi
Trailing bellflower
Campanula robinsiae
Campanula poscharskyana
Betulinic acid
Chaenomeles
Pseudocydonia

Aviculin is a lignan.
 It is bio-active isolate of "Pseudocydonia sinensis" or "Polygonum aviculare".
Campanula portenschlagiana syn.
 "C. muralis", is a species of flowering plant in the family Campanulaceae, native to the Dalmatian Mountains in Croatia.
 It is a vigorous, low-growing, mound-forming evergreen perennial with deep purple flowers in summer.
 Common names include Dalmatian bellflower, Adria bellflower and wall bellflower.
Karin or Carin is a common feminine given name in various Germanic languages (geographically including Austria, Germany, Netherlands, Scandinavia, and Switzerland), and Estonia and Slovenia, and in some French-speaking areas, as well as Japanese.
 In most of its Western forms, Karin was originally a Swedish form of Katherine, but in English speaking countries is usually thought of as merely a variant spelling for Karen.
 The Japanese name Karin (花梨, かりん) means Chinese quince ("Pseudocydonia sinensis"), quince ("Cydonia oblonga") or Burmese rosewood ("Pterocarpus indicus") and is unrelated to the Western forms.
Campanula piperi (Olympic bellflower, Olympic harebell, Piper's bellflower) is a species of flowering plant in the bellflower family, Campanulaceae.
 It is native to the Olympic Mountains on the Olympic Peninsula in the U.S. state of Washington.
 It has also been noted on Vancouver Island, British Columbia.
Trailing bellflower is a common name for several ornamental plants in the bellflower family and may refer to:
Campanula robinsiae is a rare species of flowering plant in the bellflower family known by the common names Brooksville bellflower, Robins' bellflower, and Chinsegut bellflower.
 It is endemic to Florida, where it is known from four or five occurrences in Hernando and Hillsborough Counties.
 Its population has fluctuated throughout the years; at one point in the early 1980s it was feared extinct.
 Today there are two populations in Hernando County and probably three in Hillsborough River State Park.
 At the time the plant was listed as an endangered species of the United States in 1989, it was known from three small populations on wet prairies that were threatened by changes in the local hydrology and by pollution.
 It was also thought to be threatened by vandalism, trampling, and collecting by flower enthusiasts.
 Cattle grazing and invasion of the habitat by the exotic skunkvine ("Paederia foetida") also degrade the habitat.
Campanula poscharskyana (Serbian bellflower, trailing bellflower) is a semi-evergreen trailing perennial, valued for its lavender-blue star-shaped flowers, native to the Dinaric Alps in former Yugoslavia.
Betulinic acid is a naturally occurring pentacyclic triterpenoid which has antiretroviral, antimalarial, and anti-inflammatory properties, as well as a more recently discovered potential as an anticancer agent, by inhibition of topoisomerase.
 It is found in the bark of several species of plants, principally the white birch ("Betula pubescens") from which it gets its name, but also the ber tree ("Ziziphus mauritiana"), selfheal ("Prunella vulgaris"), the tropical carnivorous plants "Triphyophyllum peltatum" and "Ancistrocladus heyneanus", "Diospyros leucomelas", a member of the persimmon family, "Tetracera boiviniana", the jambul ("Syzygium formosanum"), flowering quince ("Pseudocydonia sinensis", former "Chaenomeles sinensis KOEHNE"),
Chaenomeles is a genus of three species of deciduous spiny shrubs, usually 1–3 m tall, in the family Rosaceae.
 They are native to Japan, Korea, China, Bhutan, and Burma.
 (Burmese: ချဉ်စော်ကား ) These plants are related to the quince ("Cydonia oblonga") and the Chinese quince ("Pseudocydonia sinensis"), differing in the serrated leaves that lack fuzz, and in the flowers, borne in clusters, having deciduous sepals and styles that are connate at the base.
Pseudocydonia sinensis, the Chinese quince, is a deciduous or semi-evergreen tree in the family Rosaceae, native to eastern Asia in China, and the sole species in the genus Pseudocydonia.
 It is closely related to the east Asian genus "Chaenomeles", and is sometimes placed in "Chaenomeles" as "C. sinensis", but notable differences are the lack of thorns, and that the flowers are produced singly, not in clusters.
 The Chinese quince is also closely related to the European Quince genus "Cydonia"; notable differences include the serrated leaves, and lack of fuzz.