Stigmaphyllon patricianum-firmenichianum Butaud, 2015

Butaud, Jean-Francois, 2015, Stigmaphyllon patricianum-firmenichianum (Malpighiaceae), a new species from Loyalty Islands, New Caledonia, PhytoKeys 55, pp. 119-127 : 120-124

Stigmaphyllon patricianum-firmenichianum Butaud sp. nov.

Type.

New Caledonia, Loyalty Islands, Ouvéa, Banutr, bord de route menant à l’aéroport, 20°38.345'S, 166°33.726'E, 11 m alt., liane de 5 m à fleurs mâles de couleur jaune, en lisière de forêt secondaire à Podonephelium et Elattostachys , 17 December 2013, J.-F. Butaud 3346 (holotype NOU!, isotype P!).

Diagnosis.

Stigmaphyllon patricianum-firmenichianum is most similar to Stigmaphyllon discolor (Gand.) C.E.Anderson and Stigmaphyllon mcphersonii C.E.Anderson in the tomentose vesture of the abaxial surface of the blade which differentiates them from the other New Caledonia Stigmaphyllon species. Stigmaphyllon patricianum-firmenichianum differs from Stigmaphyllon discolor by the number of stamens, respectively 10 and 12-16, and by the number of flowers in each umbel, respectively 4-9 and 8 –18(– 20), and from Stigmaphyllon mcphersonii by the number of functional styles of the male flowers, respectively 3 and none (styles absent or rarely 1, rudimentary and without stigma), by the sepals length, respectively 2.8-3 mm and 1.5-2 mm, by the petals length, respectively 8-10 mm and 6-27 mm, and by the dorsal wing of samara, respectively 2.6-2.9 cm and 1.7-2 cm long.

Description.

Liana to over 8 m long; young stems tomentose, the vesture caducous in older parts, eventually becoming glabrate to glabrous. Blade of the larger leaves 4.8-7.5 × 3-5.4 cm, suborbicular to broadly ovate or ovate, apex emargin ate to obtuse, acute or apiculate, base cordate to truncate, adaxially tomentose or sericeous when young, soon glabrescent to glabrous or with some hairs retained on costa, secondary veins and near the petiole, abaxially tomentose, eventually sericeous in older leaves, but in some leaves the vesture unevenly deciduous except close to the costa and at the apex and the petiole where always dense, secondary veins 4-7 pairs, prominent abaxially; marginal glands 0.1-0.3 mm diam.; petiole 1.3-2.6 cm long, tomentose, in older leaves the vesture sloughed off in patches, with a pair of glands borne at apex or partly on the base of the blade above insertion of the petiole, each gland 0.5-0.6 mm diam., slightly prominent; stipules 1 on each side of petiole, narrowly triangular, bractlike, to 1 mm long, abaxially tomentose, sometimes hidden by stem vesture. Hermaphrodite flowers 5-9 in each umbel or condensed pseudoraceme; umbels solitary or borne in dichasia; inflorescence stalks 1.1-2.9 cm long, often terminating a pair of foliaceous bracts, peduncles 3-5 mm long, pedicels 4-8 mm long, both tomentose; bracts c. 1 mm long, narrowly triangular, bracteoles c. 1 mm long, narrowly triangular, bracts and bracteoles abaxially tomentose. Sepals 5, 2.8-3 × 2.2-2.5 mm, orbicular or broadly ovate, abaxially densely sericeous but often glabrous along the margin. Petals 5, yellow, obovate with a claw 0.5-1 mm long, limb 8-10 × 5.5-7 mm, base acute or truncate, margin subentire or shallowly erose. Stamens 10; filaments c. 3 mm long; anthers without apiculum, glabrous. Ovary c. 1.6 mm long; 3 free styles c. 3.5 mm long, c. 0.1 mm diam., stigma c. 0.3 mm diam., peltate. Male flowers in inflorescences, and with sepals and petals, similar to hermaphrodite flowers: stamens 10, filaments c. 3 mm long; anthers without apiculum, glabrous; ovary rudimentary, a tiny mound of tissue embedded in a tuft of hairs; styles 3, c. 3 mm long, c. 0.1 mm diam., free or 2 variously united, stigma c. 0.3 mm diam., peltate. Fruit: a schizocarp splitting into 3 samaras, pedicels 4-7 cm long. Dorsal wing of samara 2.6-2.9 × 1.1-1.4 cm; nut 4-5 mm long, c. 4 mm diam., broadly ovoid to spheroid, with prominent ridges, lateral winglets absent; areole 2.5-3 mm long and wide.

Phenology.

Flowers (emitting a pleasant odor) from November to April; fruits from February to May.

Distribution.

New Caledonia, endemic to Loyalty Islands; known only from Ouvéa, Lifou and Maré islands. Not recorded on the smaller islands of Beautemps-Beaupré, Tiga and Walpole.

Habitat.

This species is restricted to the calcareous soils of uplifted atolls between 5 and 90 m elevation, in littoral open forest or shrubland, and in the interior on plateau open forest or shrubland. It is also commonly found among the naturally open and shrubby vegetation of the cliffs between littoral and plateau. This vine is characteristic of fallows, young shrublands and secondary forests following shifting cultivation. It is also commonly found along roads and close to villages in open and sunny areas. The vegetation is often composed of trees and shrubs, such as Acacia spirorbis Labill., Acronychia laevis J.R.Forst. & G.Forst., Elattostachys apetala (Labill.) Radlk., Glochidion billardierei Baill., Morinda citrifolia L., Pipturus argenteus (G.Forst.) Wedd. var. lanosus Skottsb., Podonephelium homei (Seem.) Radlk., and Polyscias bracteata (RVig.) Lowry subsp. bracteata .

Conservation status.

Using the categories and criteria of IUCN (2001), the IUCN Red List Category Least Concern (LC) for Stigmaphyllon patricianum-firmenichianum is proposed. Indeed, this is a common vine of anthropized areas on the three islands, i.e. in villages, cultivated areas, fallows, shrubland, roadsides, and open littoral forest on the calcareous cliffs. No decline is estimated or has been documented.

Etymology.

I am pleased to name this new species for Patrick Firmenich (b. 1962), former Chief Executive Officer of Firmenich, a leading Swiss company creating fragrances and flavors. The Firmenich Charitable Foundation is supporting the sustainable management of the Loyalty Islands biodiversity, especially on Ouvéa atoll, a natural World Heritage site.

Common names.

The common names recorded for Stigmaphyllon patricianum-firmenichianum are “watoma” on Lifou (herbarium specimens Deplanche 74, Däniker 2468 & Bergeret 86; Däniker 1932; Lenormand 1999, 1968) and “tai” on Maré (herbarium specimen Däniker 2497; Däniker 1932; Dubois 1971; Lormée et al. 2011). No common name has been recorded on Ouvéa.

Discussion.

Stigmaphyllon patricianum-firmenichianum is the sole member of the genus Stigmaphyllon in the Loyalty Islands. It is allied with Stigmaphyllon discolor and Stigmaphyllon mcphersonii with which it shares an abaxial tomentose vesture of the blade. Its inclusion under Stigmaphyllon taomense , a species with an abaxially sericeous blade, by Anderson (2011), may stem from the patchily deciduous vesture of some leaves, which can give the impression of a sericeous blade. Moreover, Stigmaphyllon patricianum-firmenichianum , Stigmaphyllon mcphersonii and Stigmaphyllon taomense have all 10 stamens, whereas Stigmaphyllon discolor bears 12-16 stamens. Nevertheless, its closest affinity in New Caledonia apparently is with Stigmaphyllon discolor , which occurs on most of the southern part of Grande-Terre and Isle of Pines. In South-East Asia and the Western Pacific, it is most similar to Stigmaphyllon albidum (Blume) C.E.Anderson, which can be differentiated by the absence of a style in male flowers. This new species is also clearly different from the widely distributed Stigmaphyllon timoriense , which has male flowers usually without styles and blades abaxially sericeous to glabrate.

Specimens examined.

Loyalty Islands. Lifou, E. Deplanche 74 (P scan!); Lifou, Mou, 28 November 1925, A.U. Däniker 2468 (Z [3] scan!); Lifou, 1927, C. Bergeret 86 (P scan!); Lifou, We-Kodegni, forêt mi-dense, halliers, 14 February 1966, M. Schmid 1038 (NOU!, P scan!, MICH n.v.); Lifou, Mutchaweng, 30 m, forêt sur terrain plat caillouteux, 18 February 1974, H. MacKee 28179 (P scan!, MICH n.v.); Lifou, hauteurs au SE du Cap Lafon, 90 m, forêt saxicole, 20 February 1974, H. MacKee 28295 (P scan!, MICH n.v.); Lifou, Wanaham, bord de route menant à Hnacaom, 20°47.037'S, 167°13.979'E, 38 m alt., liane de 5 m à fleurs femelles jaunes odorantes et jeunes fruits, en lisière de forêt secondaire à Acacia , Glochidion , Polyscias , Acronychia , Secamone , 15 April 2015, J.-F. Butaud 3424 (NOU!, P!); Lifou, Xodre, bord de route menant au plateau, 21°7.682'S, 167°24.403'E, 58 m alt., liane de 5 m à fruits matures, en lisière de forêt de corniche à Ficus virgata , Pipturus , Mucuna , Morinda , 15 April 2015, J.-F. Butaud 3426 (NOU!, P!); Maré, Tadine, 15 December 1925, A.U. Däniker 2497 (Z [2] scan!).