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Card. Bull. Singapore 69(2) 2017 
Fig. 3. The habitat of Ceropegia laotica Rodda & Meve in the vicinity of Ban Hnongluang Wat, 
Laos. Open grassland vegetation on very thin soils with exposed bedrock. (Photo: M. Rodda) 
consider that only a small part of it has suitable rocky habitat for the species (AOO < 
500 km 2 ) and also take into account that the area is heavily affected by habitat loss due 
to land conversion to agriculture, mining and dams (Delang et al., 2013), a provisional 
conservation status can be assessed as endangered pending more information which 
might increase the threat status further. 
Additional specimens examined. Ceropegia laotica. Cultivated plant grown on from Laos, 
Champasak Province, Paksong, Dong Hua Sao NBCA, Bolaven Plateau, Ban Hnongluang Wat, 
15°07'57"N 10°20'57"E, 1258 m, 23 October 2015, Rodda, M. et al. MR1418, vouchered at 
Singapore Botanic Gardens on 16 May 2017 as Rodda, M. MR1802 (SING). 
Notes. The type of Ceropegia thorelii Constantin was collected from the border region 
of Cambodia and Laos. It was treated by Huber (1957) as Ceropegia macrantha Wight 
var. thorelii (Constantin) H.Huber and is a lowland species only reported from St(e) 
ung Treng (Cambodia, Mekong River). The type specimen in P ( Thorel 2148 ) is a fairly 
sturdy plant with elliptical leaves, pedunculate inflorescences and a corolla which is 
coarsely brownish spotted. Hence, Huber (1957) placed it in Ceropegia macrantha 
despite its hairy peduncles and pedicels, as did Meve (2002) who included C. thorelii 
as a full synonym of C. macrantha. Interestingly, a later collection made at Steung 
Treng (cf. Maxwell, 2009: fig. 14) has a corolla superficially comparable to the type 
of C. thorelii , but the stems and leaves are densely pilose, the leaves seem to be rather 
