Stickmannia albomarginata (Linden ex Regel) Kuntze (1891: 721)

Aona, Lidyanne Yuriko Saleme, Bittrich, Volker & Amaral, Maria Do Carmo E., 2018, Taxonomic and nomenclatural notes on Brazilian Dichorisandra (Commelinaceae), Phytotaxa 348 (1), pp. 1-13 : 2-3

2. Dichorisandra albomarginata Linden ex Regel (1868: 34) .

≡ Stickmannia albomarginata (Linden ex Regel) Kuntze (1891: 721) , syn. nov.

Lectotype (designated here):—[illustration] tab. 569 in Regel (1868), image available at https://www.biodiversitylibrary.org/page/ 40608335#page/383/mode/1up

= Dichorisandra macrophylla Gleason (1932: 740) , syn. nov.

Type:— BRAZIL. Minas Gerais: Viçosa, Agricultural College lands. 670 m. Near W. boundary. Cut on woods. 25 February 1930, Ynes Mexia 4403 (holotype: NY 00247439 !; Isotypes MO!, K 000363211 !, BM 000884415 !, F 0093578 F!, B 100555257 !, MICH 1111085 !, RSA 0000203!, U 0256228 !, IAN 082086 !, GH 00029564 !, PH 00011478!, UC 476639 !) .

= Tradescantia superba Linden & Rodigas (1892: 29) , syn. nov.

Lectotype (designated here):—[illustration] tab. 155 in Rodigas (1892), image available at https://www.biodiversitylibrary.org/page/ 15250278#page/110/mode/1up

= Dichorisandra pubescens Martius ex Schultes f. var. taeniensis Masters (1888: 557) , syn. nov.

Lectotype (designated here):—[illustration] fig. 75 in Masters (1888), image available at https://www.biodiversitylibrary.org/item/ 84279#page/595/mode/1up

Distribution:— Dichorisandra albomarginata is distributed in the states of Bahia, Espírito Santo, Minas Gerais, and Rio de Janeiro. The collections examined from Peru and Colombia are probably from cultivated individuals.

Habitat:—Dense Ombrophilous Montane Forest and Seasonal Semideciduous Forest. This habitat is different from that occupied by closely related species such as D. thyrsiflora Mikan (1820 : T. 3) and D. procera Martius ex Schultes f. (1830: 1187) which are mainly associated with areas influenced by the ocean (arboreal restinga).

Notes:— Dichorisandra albomarginata was described from plants from Brazil that were cultivated in St. Petersburg ( Regel 1868). We were unable to find the material used by Linden to describe D. albomarginata , but the illustration in plate 596 of Regel (1868) allows the species to be identified without a doubt due to the presence of white longitudinal striations on the leaves. Thus, this illustration is here designated as the lectotype according to Art. 9.12 of the ICN ( McNeill et al. 2012). In addition, the combination of features described in Regel (1868), including diagnostic characteristics (“ Folia (...) supra argentea medio strialata viridi, subtus pallid viridia ” and “(…) antherae oblongae lutea, filamentum aequantes ”), leaves no uncertainty about the identity of the species.

The illustration of Tradescantia superba in Rodigas (1892) depicts one of the main distinctive characteristic of D. albomarginata ; i.e., leaves with white longitudinal striations. This characteristic is also mentioned in the original description of T. superba “(...) folia tamen latiora neque marmorata sed longitudinal iter argenteo vittata et valde distincta ” and we designate here the illustration in Linden as the lectotype according to Art. 9.12 of the ICN ( McNeill et al. 2012).

The specimen used by Gleason (1932) to describe D. macrophylla is an accurate representation of the characteristics of the species. Gleason (1932) mentioned only the holotype deposited at NY, but Aona (2008) found specimens with the same collection number (Ynes Mexia 4403) labelled as holotype in several other herbaria (e.g. BM, MO, K, F, B), which are isotypes. This material has the same leaf distinctive characteristics mentioned above and, therefore, D. macrophylla is here synonymized under D. albomarginata .

Masters (1888) described D. pubescens var. taeniensis and cited characteristics such as the presence of “(...) broad lanceolate leaves of a rich green colour, prettily striped with silvery bands on the upper surface” and “(...) The flowers, of a pretty blue and white colour, are borne in racemes on the end of the stem”. Although voucher specimens of the cultivated material used by Masters to describe D. pubescens var. taeniensis have never been found, the illustration included in Masters (1888) reliably shows the main characteristics of the species and, together with the information in the diagnosis, there is no doubt that Master’s species is the same as D. albomarginata . Thus, we chose fig. 75 in the work by Masters as the lectotype and synonymized the name D. pubescens var. taeniensis under D. albomarginata .