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

doi:10.15625/0866-7160/v34n3.2465

Author affiliations

Authors

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

DOI:

https://doi.org/10.15625/0866-7160/v34n3.2465

Keywords:

Bignoniaceae, Radermachera, Radermachera microcalyx, Lao Cai, Vietnam

Abstract

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).