A new record of species Radermachera microcalyx C. Y. Wu & W. Yin (Bignoniaceae) for the flora of Vietnam

Vu Xuan Phuong, Do Thi Xuyen, Dang Quoc Vu, Phung Van Phe, Dang Van Son
Author affiliations


  • Vu Xuan Phuong VAST
  • Do Thi Xuyen Institute of Ecology and Biological resources, VAST
  • Dang Quoc Vu Forest Protection Department
  • Phung Van Phe Vietnam Forestry University
  • Dang Van Son Institute of Tropical Biology, VAST




Bignoniaceae, Radermachera, Radermachera microcalyx, Lao Cai, Vietnam


The genus Radermachera Zollinger & Morit compcises about 16 species, mainly distributed in tropical Asia, there are 7 Radermachera species in Vietnam. During the study of specimen and documents of Gesneriaceae of Vietnam, we found Radermachera microcalyx C. Y. Wu & W. Yin in Lao Cai province, North Vietnam.

Radermachera microcalyx is tree, ca. 20 m tall. Leaves compound pinnately 1 times, ca. 40-60 cm long; leaflet 5-7 pairs, ovate or elliptic, ca. 11-26 × 4-6 cm, margin entire, lateral 6-10 pairs. Inflorescences thyrsus, terminal; calyx campanulate, 5 small teeth, apex truncate; corolla pale yellow, tube ca. 2-2,5 mm long; style filiform; capsule line, dehiscung by 2 valves; seeds many, minute. This species is closed to R. glandulosa but differs by having leaves dim glandular in abaxial, corolla tube 2.0-2.5 cm long, ca. 4-5 mm in diam. Voucher specimens were collected in Hoang Lien - Van Ban reserver, Lao Cai province and deposited in the Herbarium of the Institute of Ecology and Biological Resources, Hanoi, Vietnam (HN).


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How to Cite

Phuong, V. X., Xuyen, D. T., Vu, D. Q., Phe, P. V., & Son, D. V. (2012). A new record of species Radermachera microcalyx C. Y. Wu & W. Yin (Bignoniaceae) for the flora of Vietnam. Academia Journal of Biology, 34(3), 334–336. https://doi.org/10.15625/0866-7160/v34n3.2465