From the stem barks of Swintonia griffithii, six flavonoids: (–)‐naringenin (1), (–)‐eriodictyol (2), (+)‐taxifolin (3), (–)‐butin (4), (–)‐fustin (5), and 3′,4′,7‐trihydroxyflavone (6) were isolated. Their structures were determined based on the spectroscopic interpretation and compared with those of reported data. In the tyrosinase inhibitory activity test, (+)‐taxifolin (3) and 3′,4′,7‐trihydroxyflavone (6) exhibited potent effect with the IC50 values of 20.9 and 56.7 μM, respectively.

Conamomum pierreanum (Gagnep.) Skornick. & A. D. Poulsen, (Zingiberaceae), a previously known species from Thailand and Cambodia, is here reported, as a new record for Vietnam. It is similar to C. rubidum and C. odorum but differs in having a present stilt root; a shorter petiole, 2-3 cm; a larger leaf blade, oblong, 30-50 × 5-8 cm, glabrous; a globose to ovoid inflorescence, arising near the base of rhizome; tomentose outer surface of bract; a 3-toothed bracteole, outer surface hairy; and a smaller filament, yellowish and glabrous. The detailed morphological description, distribution and ecology information, conservation status and a colour plate of this species are given.

AristolochiamulunensisY.S. Huang & Yan Liu, an endemic species to Guangxi, China, is newly recordedfor the flora of Vietnam. Notes on distribution of someAristolochia species in Vietnam such as A. petelotii, A. balansae, A. xuanlienensis, A. quangbinhensis, andA. tadungensis are given.Additionally, the morphological characters of capsule and seeds of A. petelotii and A. balansae are firstly described. Keywords Aristolochia,Aristolochia mulunensis, distribution, new record, Vietnam References [1] S.T. Wagner, S. Isnard, N.P. Rowe, M.S. Samain, C. Neinhuis and S. Wanke, Escaping the lianoid habit: evolution of shrub-like growth forms in Aristolochia subgenus Isotrema (Aristolochiaceae), American Journal of Botany, 99 (2012) 1609.[2] T.V. Doand T.D. Nghiem, Taxonomic notes on some Aristolochia species in Vietnam, Taiwania, 62 (2017) 216.[3] O.T. Pham, H.V. Lai, T.T. Nguyen and T.V. Do, Aristolochia chlamydophylla (Aristolochiaceae), a new record for the flora of Vietnam, VNU Journal of Science: Natural Sciences and Technology, 34 (2018) 69.[4] S.M. Hwang, L.M. Kellyand M.G. Gilbert, Aristolochiaceae in Flora of China, volume 5, Missouri Botanical Garden Press Beijing, St. Louis, 2003.[5] Y.S. Huangand Y. Liu, Aristolochia mulunensis (Aristolochiaceae) a new species from limestone areas in Guangxi, China, Annales Botanici Fennici, 50 (2013) 175.[6] H.H. Pham, Aristolochia in An Illustrated Flora of Vietnam, volume 3, Young Publishing House, Ho Chi Minh, 2000 (In Vietnamese).[7] N.T. Ban, Aristolochia in Checklist of Plant species of Vietnam, volume 2, Agriculture Publishing House, Hanoi, 2003 (In Vietnamese)[8] N.T.T. Huong, D.V. Hai, B.H. Quang, N.T. Cuong, N.S. Khang, D.Q. Vuand J.S. Ma, Aristolochia xuanlienensis, a new species of Aristolochiaceae from Vietnam, Phytotaxa, 188 (2014) 176.[9] T.V. Do, T.D. Nghiem, S. Wankeand C. Neinhuis, Aristolochia quangbinhensis (Aristolochiaceae), a new species from central Vietnam, Phytokeys, 33 (2014) 51.[10] T.V. Do, H.T. Luu, S. Wankeand C. Neinhuis, Three new species and three new records of Aristolochia subgenus Siphisia from Vietnam including a key to the Asian species, Systematic Botany, 40 (2015) 671.[11] A. Franchet, Plantarum sinensium ecloge secunda, Journal de Botanique (Morot), 12 (1898) 311. [12] O.C. Schmidt, Aristolochiaceae inDie natürlichen Pflanzenfamilien volume 2, 16B eds. A. Engler & K. Prantl. Leipzig: Engelmann, 1935.

Aristolochia chlamydophylla C.Y. Wu ex S.M. Hwang, a medicinal plant and main distribution from northern Thailand and south-eastern China, is newly recorded for the flora of Vietnam. This species was misidentified to A. kaempferi in Vietnamese herbaria. An extent description, illustrations and taxonomic notes of Aristolochia chlamydophylla are also provided.