Heterostemma tanjorense Wight & Arnott

Rodda, Michele, 2016, Checklist and typification of Heterostemma (Apocynaceae, Asclepiadoideae, Ceropegieae), Phytotaxa 263 (1), pp. 1-17 : 12

Heterostemma tanjorense Wight & Arnott in Wight (1834: 42) [Dec 1834] (as ‘ tanjorensis ’)

TYPE:— INDIA, Sandy places in Tanjore, Porto Novo, 22 November 1810, J. G. Klein, s.n., [Herb. R. Wight propr. 1527] [=Wall. Cat.

8178]. (lectotype K [K000895029], designated by Kambale et al. (2015), isotypes K [K000974157], LIV [sheet no. 1952.121.4426],

possible isotypes A [A00076435], BM [ BM 001014269], BR [ BR 0000006962883], C [C10006711, C10006710], CGE (3 duplicates),

E [E00179589, E00179590, E00179591, E00179592, E00775906, E00775907, E00775908], HAL [ HAL 0114443], K (3 duplicates),

MPU [ MPU 019215], OXF, P [P03899125, P03899126, P03899131] = Heterostemma tanjorense Wight & Arnott var. zeylanicum Hooker (1883b: 48) [Jun 1883] (synonymised by Huber 1983) TYPE:— SRI LANKA, 1856, G.H.K Thwaites C.P. 1859 (lectotype K [K000895028], here designated, possible isotype P [P03899127]) = Stapelia involucrata nom . nud. (ex [K000895029], [E00179589]) = Stapelia volubilis nom . nud. (ex Herb. R. Wight. Prop., K)

Notes: —The materials listed by Wight for H. tanjorense are clarified by Noltie (2006) as ‘[Porto Novo], herb. Madras, Wall. Asclep 112. [= Wall. Cat. 8178]. Sandy places in Tanjore, Wight, WC 1527 ’. Huber (1983) indicated the type of H. tanjorense as ‘Herb. Wight propr. 1527 (K)’. This would be an effective lectotypification under Art. 9.9 of the ICN ( McNeill et al. 2012). However at K there are four specimens bearing HRWP 1527. Kambale et al. (2015) selected [K000895029] as lectotype for H. tanjorense , a specimen also labelled ‘ Stapelia involucrata, Porto Novo, Novb. 22, 1810’. In LIV there is a specimen labelled ‘ Stapelia involucrata, Dr. Klein, Porto Nov. Nov 22 1810 ’ pencilled ‘ Heterostemma tanjorense Wall 8178’ in Wight’s hand. This is an isotype and the only one clarifying the name of the collector (J.G. Klein). Another K specimen ( Fig. 1 ) bears a manuscript description of the taxon by Wight’s hand but does not bear any collection information.

Noltie (2006: 169) indicated that ‘The Wight number (1527) seems to include Missionary material and more than one of his own collections’ therefore sheets that only bear Wight’s number and no further data are here considered as possible isotypes.

Specimen [C10006712], labelled ‘1527’ does not belong to Heterostemma and can’t be considered an isotype.

The type of H. tanjorense var. zeylanicum was indicated by Hooker (1883b) as ‘ H. tanjorense, Thwaites Enum. 198.- Ceylon Central Province, ascending to 4000 ft’. Hooker & Thwaites (1864) mentioned C.P 1856 (1859) as H. tanjorense . One sheet of C.P. 1859, annotated Thwaites Enum. n. 198. is present at K and is here designated as lectotype for H. tanjorense var. zeylanicum .

Figures

FIGURE 1. Photograph of possible isolectotype of Heterostemma tanjorense from Wight’s personal working herbarium (K). The sheet bears an Herb. R. Wight propr. label in the lower right corner, is pencilled [Wight cat. n.] 1527 in the lower left corner and has extensive notes about the taxon in Wight’s hand. A pencilled note by C.B. Clarke reads ‘found in Wight’s bundle of Heterostemma’. Reproduced with the consent of the Royal Botanic Gardens, Kew.