Heterostemma succosum (Apocynaceae), a new record for Laos

Abstract

Heterostemma succosum is reported as a new record for Laos. A description and an illustration are provided.

Heterostemma cucphuongense (Apocynaceae, Asclepiadoideae), a new species from Vietnam

“…While conducting fieldwork in Cuc Phuong National Park, Nho Quan district, Ninh Binh Province in Vietnam, an unidentified species of Heterostemma was collected. From the relevant literature (Costantin 1912;Swarupanandan et al 1989;Ho 1993;Li et al 1995;Tran 2005Tran , 2017Tran and Kim 2010;Thaithong et al 2018;Agnihotri et al 2019;Kidyoo 2019;Thammarong et al 2019), as well as an examination of specimens in the herbaria BK, BKF, BM, HN, HNU, HNPM, IBK, IBSC, K, KUN, KYO, P, SING, TI, TO, TUT and VNM (acronyms according to Thiers 2020), we have confirmed that it is a new species. Here, we describe and illustrate this new species as H. cucphuongense T.B.…”

Heterostemma menghaiense (Apocynaceae), a new record for Laos and Thailand

“…In Laos, it was found in northern Laos, Houaphanh Province, along a ridge at 1,543 m, in evergreen mossy forest. It is similar to Heterostemma succosum Kerr, a species occurring in Thailand and Laos (Thammarong et al, 2019), as both species have subsessile or shortly pedunculate inflorescences, large (> 2 cm diam. when fresh) rotate yellow corollas, often with diffuse pale reddish-brown speckles.…”

“…In Thailand, nine species are recorded (Thaithong et al, 2018;Kidyoo, 2019;Agnihotri et al, 2019;Kidyoo & Thaithong, 2019;Thammarong et al, 2020). In neighbouring Laos, four species of Heterostemma were previously recorded (Newman et al, 2007;Jin et al, 2016;Thammarong et al, 2019;Thammarong et al, 2020).…”

Heterostemma brownii (Apocynaceae), a new record for Laos and Thailand

“…If new evidence were to be found to indicate this specimen is not original material, and if no alternative original material is found, then the lectotypification designated here would count as an effective neotypification under Art. 9.10 of the ICN (Turland et al 2018).…”

“…In Laos, only three species of Heterostemma are recorded, Heterostemma grandiflorum Costantin, H. oblongifolium Costantin and H. succosum Kerr (Newman et al, 2007;Jin et al, 2016;Thammarong et al, 2019).…”