Polyosma spicata Baillon (1873: 343)

Pillon, Yohan, 2018, Nomenclature and typification in Polyosma (Escalloniaceae) from New Caledonia, with the description of a new species, Phytotaxa 371 (4), pp. 267-272 : 269

publication ID	https://doi.org/ 10.11646/phytotaxa.371.4.4
persistent identifier	https://treatment.plazi.org/id/6A45A14A-FF81-FFF8-B4ED-FEB7FDD50F62
treatment provided by	Felipe
scientific name	Polyosma spicata Baillon (1873: 343)
status

Treatment

Polyosma spicata Baillon (1873: 343) View in CoL .

Type:— NEW CALEDONIA. s. loc., s. dat., Pancher & Sebert s.n. (not found)

The protologue indicates “In Austro-Caledonia leger. cl. Pancher et Sébert (herb.)”, but the type specimen could not be located in P (see P. discolor ) .

Polyosma subintegrifolia (Guillaumin) Pillon View in CoL comb. & stat. nov. Basionym: Polyosma pancheriana var. subintegrifolia Guillaumin (1920: 177) View in CoL .

Lectotype (designated here):— NEW CALEDONIA. forêts situées au NE de la Conception, vers 700 m, 24 January 1869, Balansa 1030

(P-02582548!, isolectotypes: E-00346921!, NY-185898!, P-02582546!, P-02582547!). Syntypes:− Sebert (P-02582600!); forêts

situées au-dessus de la Conception, October 1868, Balansa 602 (P-02582549!, P-02582550!, P-0258251!).

In his description, Guillaumin (1920) cited several collections: Sebert, Lecard, Balansa (environs de la Conception) and Le Rat 831 (plateau de Dogny). Four sheets at P bear the handwritten name “ Polyosma pancheriana Baill var subintegrifolia Guillaum ”: Lecard s.n., Sebert s.n., Balansa 602 and Balansa 1030, only the last three have Guillaumin’s signature. The two Balansa collections were made above Conception, and the one sheet of Balansa 1030 with Guillaumin’s handwriting is chosen as a lectotype because it has well developed fruits. Two syntypes are excluded: Lecard s.n. (P-02582593!), which belongs to P. pancheriana s.s. and Le Rat 831 (P-02582588!) from “plateau de Dogny” (doubtful locality), which belongs to P. brachystachys .

This taxon displays a combination of characters of P. leratii (leaf mostly entire, inflorescences many, some inserted low on branches) and P. pancheriana (mostly glabrous, acuminate leaves). A hybrid origin comparable to that of Cunonia × koghicola H.C. Hopkins, J. Bradford & Pillon (in Pillon et al. 2008: 423), which has a similar distribution, may be hypothesized ( Hopkins et al. 2014).