Heterostemma acuminatum Decaisne (1838: 268)

Rodda, Michele, 2016, Checklist and typification of Heterostemma (Apocynaceae, Asclepiadoideae, Ceropegieae), Phytotaxa 263 (1), pp. 1-17 : 4

Heterostemma acuminatum Decaisne (1838: 268)

TYPE:— INDONESIA. Java, ‘ Goudo-san ’, s.d., J.B.L.T. Leschenault 228 (lectotype P [P00607325], here designated)

= Heterostemma papuanum Schlechter (1905: 369) [November 1905] (synonymised by Forster 1992) TYPE:— PAPUA NEW GUINEA, Madang Province, Ramu, January 1902, R. Schlechter 14110 (lectotype BO, designated by Forster & Liddle (1994))

= Tylophora calcarata Bentham (1869: 335) (synonymised by Forster 1992)

TYPE:— AUSTRALIA, Queensland, Rockhampton, 1868, A. Thozet s.n. (lectotype K [K000894685] designated by Forster & Liddle (1994), possible isotype at MEL [ MEL 113588])

Notes: —The only original material cited in the protologue of H. acuminatum is a specimen collected by Leschenault in Java bearing the common name ‘ Goudo-san ’, ‘Hab. in insula Javae (Leschenault) vulgo Goudo-san ’. Forster (1992) mentioned the holotype of H. acuminatum as Leschenault s.n.. I have not found that specimen but instead Leschenault 228 in P is annotated with ‘ Goudo-san ’ and is therefore selected as lectotype for H. acuminatum .

Two syntypes are mentioned in the protologue of H. papuanum ( Schlechter 1905: 369) , Schlechter 14110 and Schlechter 18877. Schlechter 14110 (BO) was designated as lectotype by Forster & Liddle (1994). Duplicates of Schlechter 18877 are present at K [K000894689] and P [P03899067].

Forster (1992) indicated the holotype of T. calcarata as Thozet 501 (K), with a duplicate in MEL. This would be an effective lectotypification under Art. 9.9 of the ICN ( McNeill et al. 2012). However upon examination of specimens at K I could not locate Thozet 501 but only Thozet s.n. [K000894685]. The lectotype citation is therefore amended. The MEL isotype cited by Forster (1992) [ MEL 113588] is instead Thozet 501 and its isotype status is therefore uncertain.