Isochilus pauciflorus, Cogn., 1910

Maddi, Franck A., 2021, Revised typifications of Isochilus pauciflorus Cogn. (Orchidaceae, Laeliinae) and its synonyms, Adansonia (3) 43 (24), pp. 257-268 : 258

NOMENCLATURAL NOTES

The synonymy of Isochilus pauciflorus differs among authors and is widely debated.

Although I. pauciflorus matches the characteristics of the genus Scaphyglottis , this species cannot be transferred to S. pauciflora because this name was published earlier by Schlechter (1906) and is a synonym of S. behrii (Rchb. f.) Benth. & Hook. f. ex Hemsl. 1884 . The consequence is that all synonyms are heterotypic:

Ponera punctulata Rchb. f. Bonplandia 3 (15-16): 220-221 ( Reichenbach 1855); for typification, see citation below.

Scaphyglottis punctulata (Rchb. f.) C. Schweinf. Botanical Museum Leaflets 17 (2): 47 ( Schweinfurth 1955); nomen usitum.

Helleriella punctulata (Rchb. f.) Garay & Sweet Flora of the Lesser Antilles: Leeward and Windward Islands 1: 167-169 ( Garay & Sweet 1974).

REMARKS

The diagnosis of I. pauciflorus is in accordance with S. punctulata and many authors accept it in synonymy ( Garay & Sweet 1974; Fournet 1978; Adams 1993; Feldmann & Barré 2001; Feldmann 2002, 2012; Maddi 2014).

Epidendrum dussii Cogn. Symbolae Antillanae: seu fundamenta florae Indiae occidentalis 6 (3): 482-483 ( Cogniaux 1910). —

Types: Guadeloupe. “ supra arbores in sylvis Nez-Cassé ” (sic), s.d., A. Duss 4170; Grenada “ supra arbores locis elevatis ” (sic), s.d., Broadway 1097 .

LECTOTYPE (designated by Garay & Sweet 1974: 169). — Guadeloupe. “ supra arbores in sylvis Nez-Cassé ” (sic), s.d., A. Duss 4170 (lecto-, NY [ NY00008795 ]).

REMARKS

The relationship between I. pauciflorus and Epidendrum dussii differs between authors too. Garay & Sweet (1974), Feldmann & Barré (2001) and Feldmann (2002) subscribed to the synonymy, but Stehlé (1939) and Adams (1993) did not. Of course, the diagnoses for these species differ on a few points regarding leaves, labellum, disc and column. Despite these noticeable differences pointed out by Cogniaux, the specimen of E. dussii, Duss 4170 (NY00008795), looks very similar to that of P. punctulata (K000079638) and does not match better other orchids occurring in Guadeloupe than S. punctulata , a rather variable species. The lectotypification by Garay & Sweet (1974: 169) is valid because the publication was effective ( Turland et al. 2018: arts 7.10, 7.11, 9.22), so the lectotypification by Nir (2014: 473) is superfluous.