Tuesday, October 26, 2021

[Botany • 2021] Bretschneidera sinensis • Akaniaceae, A New Family Record for Laos

  Bretschneidera sinensis Hemsl.

 Lanorsavanh, Lamxay,  Mattapha, et al., 2021.
ດອກພວງບົວຈອມວອຍ || DOI: 10.20531/tfb.2021.49.2.10

A collection from Phou Chom Voy Provincial Protected Area, Bolikhamxai, represents the first records for the family Akaniaceae as well as the genus Bretschneidera and the species Bretschneidera sinensis in Laos. Here we report the new and extended distributional range. A detailed description and photographs are provided for easy identification.

Keywords: Brassicales, Bretschneideraceae, extended distribution, Indo-China

Bretschneidera sinensis Hemsl.:
A. Leafy twig with inflorescences; B. Bark; C. Flowers; D. Corolla with 5 lobes (dissected). E. Calyx (corolla lobes removed) showing inside of calyx, attachment of ovary and stamens (above) and outside of calyx with minute lobes (below). F. Stamens.
 Scale bars: 1 cm. All from SL2157 by S. Lanorsavanh.

Bretschneidera Hemsl.

Bretschneidera sinensis Hemsl.

Tree 10–25 m tall. Bark grey-brown, young twigs with lenticels and leaf scars. Leaves imparipinnate, with 8–31 leaflets; venation pinnate; stipules present, caducous; leaflets opposite or lower ones alternate, margin entire. Inflorescence racemose, terminal. Flowers zygomorphic. Calyx 5-lobed. Petals 5, imbricate, free, adnate at middle to upper part of calyx tube, upper petal hood-like, covering stamens and style. Stamens 8 (4+4). Disk present. Ovary3-locular, hairy; ovules pendulous; style apically bent abruptly downward. 

A monospecific genus; Bretschneidera sinensis; previously known from India, S China, Taiwan, N Thailand and N Vietnam, it is now also known for Laos.

Ecology & Phenology.— In Laos collected near a stream in evergreen forest at ca 1,100 m alt. Flowering in March.

Vernacular.— ດອກພວງບົວຈອມວອຍ (Dok phuang boua chom voy).

Soulivanh Lanorsavanh, Vichith Lamxay, Sawai Mattapha, Keooudone Souvannakhoummane, Khamfa Chanthavongsa and Somchanh Bounphanmy. 2021. Akaniaceae, A New Family Record for Laos. Thai Forest Bulletin (Botany). 49(2); 231-235. DOI: 10.20531/tfb.2021.49.2.10