Mezoneuron ouenensis (Guillaumin) R. Clark, 2015
publication ID |
https://doi.org/ 10.11646/phytotaxa.207.1.3 |
DOI |
https://doi.org/10.5281/zenodo.13642387 |
persistent identifier |
https://treatment.plazi.org/id/03C4C57D-FFF2-2C5F-FF2D-F93A0D73FD43 |
treatment provided by |
Felipe |
scientific name |
Mezoneuron ouenensis (Guillaumin) R. Clark |
status |
comb. nov. |
Mezoneuron ouenensis (Guillaumin) R. Clark View in CoL comb. nov.
Basionym. Caesalpinia ouenensis Guillaumin View in CoL , Bulletin de la Société Botanique de France 83: 308–309. 1936.
Holotype:— NEW CALEDONIA: Balansa, B. 312, 27 ‘7bre’ 1868 (fl.) P (P00379653!)
Shrub, 1– 2 m. Stems without recurved prickles, glabrous. Stipules unknown. Leaves bipinnate, unarmed, all parts glabrous; pinnae 2–3 opposite pairs, paripinnate; leaflets opposite, 1–2 pairs per pinna; petioles 2.5–3.5 cm; rhachis 6.5–7.5 cm; pinnae 1.5–3.8 cm. Leaflets orbicular to obovate, base oblique, apex rounded; 3.3–5 × 2.7–4 cm; secondary veins anastomosing, visible on both surfaces. Inflorescence an axillary raceme, c. 7 cm long, all parts glabrous. Pedicels 8–10 mm, not articulated. Bract at base of pedicel 2–3 mm long, lanceolate. Hypanthium c. 3mm deep, glabrous, lower calyx lobe c. 9 × 3 mm, other lobes c. 6–7 × 3 mm, glabrous. Median petal size unknown, lateral petals c. 11–13 mm long. Stamens 10, c. 12–15 mm long, glabrous; ovary not seen. Fruit unknown. ( Figure 2 View FIGURE 2 )
Distribution:— Endemic to New Caledonia. Known only from the type specimen, collected on Ile Ouen (South Province). ( Figure 7 View FIGURE 7 )
Habitat and Ecology:— The edge of a stream. Vegetation not stated on specimen label, inferred to be maquis on ultramaphic substrate, as this is the only native vegetation type on Ile Ouen.
Phenology:— Unknown.
Preliminary Conservation Assessment:—
Category assigned:— Critically Endangered
Rationale:— M. ouenensis is determined here as Critically Endangered, as it is known only from a single specimen, collected in 1868. Ile Ouen, the type locality, is a small island (c. 8.7 × 7.2 km), which is inhabited and has been subject to anthropogenic disturbance that may have destroyed the population from which the type specimen was derived. There are very few herbarium collections from this island, particularly from recent years. This could indicate either that there is little of interest to collect on the island, which could be a result of destruction of the vegetation, or simply that the island is seldom visited by collectors. A survey of the island is required to verify this assessment.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
Kingdom |
|
Phylum |
|
Class |
|
Order |
|
Family |
|
Genus |
Mezoneuron ouenensis (Guillaumin) R. Clark
Clark, Ruth P. & Gagnon, Edeline 2015 |
Caesalpinia ouenensis
Guillaumin 1936: 308 |