Ophiorrhiza singaporensis
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This herbaceous plant was found at Bukit Timah Nature Reserve (BTNR). For a number of years, I had named it as Ophiorrhiza pumila. Eventually, when I browsed through the vascular plant checklist published in 2009 by Chong KY et.al., I realised that there is only one native Ophiorrhiza species in Singapore. Apparently, this species is found in BTNR. That was how I derived at the name as I had not seen any other picture so far.

More interestingly, it was listed as extinct. The first time that I saw the plant was on 12 July 2008 and most recently on 25 February 2012.

Reference:

Chong, K. Y., H. T. W. Tan & R. T. Corlett, 2009. A Checklist of the Total Vascular Plant Flora of Singapore: Native, Naturalised and Cultivated Species. Raffles Museum of Biodiversity Research, National University of Singapore, Singapore. 176 pp. | Read article |

Turner, I. M. & K. S. Chua, 2011. Checklist of the Vascular Plant Species of the Bukit Timah Nature Reserve. Raffles Museum of Biodiversity Research, Department of Biological Sciences, National University of Singapore, Singapore. 85 pp. | Read article |

Tan, H. T. W., K. S. Chua & I. M. Turner, 1995. Rubiaceae of the Bukit Timah Nature Reserve. Gardens' Bulletin, Singapore, Supplement 3: 29-59.