also: とちゅうか
noun
Eucommiaceae (plant family)
A monotypic plant family containing only the hardy rubber tree (Eucommia ulmoides). Used in botanical and taxonomic contexts.
See also: 杜仲
トチュウ科の植物は、中国原産のトチュウだけが現存する。
The only extant plant in the family Eucommiaceae is Eucommia ulmoides, native to China.
Refers to the hardy rubber tree itself (Eucommia ulmoides), while トチュウ科 is the botanical family name.
From トチュウ (杜仲, the hardy rubber tree) + 科 (family). The tree name is of Chinese origin.