Catalpa ovata, the yellow catalpa or Chinese catalpa (Chinese: 梓; pinyin: zǐ), is a pod-bearing tree native to China. Compared to C. speciosa, it is much smaller, typically reaching heights between 20 and 30 feet. The inflorescences form 4–10-inch-long (100–250 mm) bunches of creamy white flowers with distinctly yellow tinging; individual flowers are about 1 inch wide. They bloom in July and August. The leaves are very similar in shape to those of Paulownia tomentosa, having three lobes (two are abruptly truncated on either edge, with a third, central, slightly acute, pointed lobe forming the leaf apex), and are darkly green. Fruits are very narrow, foot-long pods.
Although native to the more temperate provinces within China (Anhui, Gansu, Hebei, Heilongjiang, Henan, Hubei, Jiangsu, Jilin, Liaoning, Nei Monggol, Ningxia, Qinghai, Shaanxi, Shandong, Shanxi, Sichuan, Xinjiang), C. ovata is also cultivated in North America and Europe. It is commonly used to make the undersides of qin.
Tree in flower in cultivation at the Birmingham Botanical Gardens
The plant contains dehydro-alpha-lapachone (DAL) which inhibits vessel regeneration, interferes with vessel anastomosis, and limits plexus formation in zebrafish. DAL also controlled the development of the fungi rice blast, tomato late blight, wheat leaf rust, barley powdery mildew and red pepper anthracnose (Colletotrichum coccodes (Wallr) S Hughes). The chemical was particularly effective in suppressing anthracnose.
Referenced in the Zhuangzi 
- Gen. hist. 4:230. 1837 GRIN (January 13, 2009). "Catalpa ovata information from NPGS/GRIN". Taxonomy for Plants. National Germplasm Resources Laboratory, Beltsville, Maryland: USDA, ARS, National Genetic Resources Program. Retrieved December 7, 2009.
- Gen. Hist. iv. 230. "Plant Name Details for Catalpa ovata". IPNI. Retrieved December 7, 2009. "Notes: =Kaempferi"
- Abh. Akad. Muench. iv. III. (1846) 142. "Plant Name Details for Catalpa kaempferi". IPNI. Retrieved December 7, 2009. "Notes: Japon"
- "Catalpa ovata - G.Don". Plants For A Future. Retrieved December 7, 2009.
- Phillips, Roger (1978). Trees in Britain, Europe and North America. Cavaye Place, London, England: Pan Books Ltd. p. 96. ISBN 0-330-25480-4.
- Phillips, Roger (1978). Trees in Britain, Europe and North America. Cavaye Place, London, England: Pan Books Ltd. p. 42. ISBN 0-330-25480-4.
- Yeung, Juni (2010). Standards for the Guqin February 2010 Draft. Toronto: Toronto Guqin Society.
- Garkavtsev I, Chauhan VP, Wong HK, Mukhopadhyay A, Glicksman MA, Peterson RT, Jain RK.,"Dehydro-alpha-lapachone, a plant product with antivascular activity." Proc Natl Acad Sci U S A. 2011 Jul 12;108(28):11596-601
- Cho, JY; Kim, HY; Choi, GJ; Jang, KS; Lim, HK; Lim, CH; Cho, KY; Kim, JC (2006). "Dehydro-alpha-lapachone isolated from Catalpa ovata stems: Activity against plant pathogenic fungi". Pest management science 62 (5): 414–8. doi:10.1002/ps.1180. PMID 16550502.
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