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''Catalpa ovata'', the yellow catalpa〔 or Chinese catalpa〔 (), 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 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. Catalpa ovata tree 1.jpg|Tree in flower in cultivation at the Birmingham Botanical Gardens CatalpaOvata.jpg|Leaves and pods Catalpa ovata.jpg|Closeup of mature Catalpa ovata at sunset ==Chemistry== The plant contains dehydro-alpha-lapachone〔(Dehydro-alpha-lapachone )〕 (DAL) which inhibits vessel regeneration, interferes with vessel anastomosis, and limits plexus formation in zebrafish.〔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〕 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. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Catalpa ovata」の詳細全文を読む スポンサード リンク
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