Oberonia integrilabris Y.L. Li & F.W. Xing, 2020

Li, Yu-Ling, Tong, Yi, Ye, De-Ping, Yao, Gang & Xing, Fu-Wu, 2020, Oberonia integrilabris (Orchidaceae), a new species from China, Phytotaxa 432 (1), pp. 104-110 : 105-107

publication ID	https://doi.org/ 10.11646/phytotaxa.432.1.9
persistent identifier	https://treatment.plazi.org/id/A83C8794-155D-FFB2-FF24-FC9CA7A9C41D
treatment provided by	Felipe
scientific name	Oberonia integrilabris Y.L. Li & F.W. Xing
status	sp. nov.

Treatment

Oberonia integrilabris Y.L. Li & F.W. Xing View in CoL , sp. nov. ( Figure 1 View FIGURE 1 & 2 View FIGURE 2 ).

Type:— CHINA. Yunnan: Pu’er City, Simao District, 1765 m alt., 10 July 2012, Y. Tong 237. (holotype IBSC!, isotype IBSC!)

Diagnosis:— Oberonia integrilabris is morphologically similar to O. jhae , especially the shape of the un-lobed lip, but differs by the following characters: leaf articulate (vs. not articulate), much larger subensiform leaves, 13–22 × 0.6–1.1 cm (vs. 1.5–3.2 cm × 0.4–0.6 cm), few lanceolate sterile bracts (vs. many triangular-oblong sterile bracts), oblong petals with irregularly toothed margin and obtuse apex (vs. lanceolate petals with entire or obscurely erose margin and acute apex) and obovate-deltoid lip (vs. elliptic-lanceolate lip) ( Table 1). In addition, O. integrilabris and O. segawae are vegetative similarities, but the former can be easily distinguished from the latter by having oblong petals with irregularly toothed margin (vs. elliptic-oblong petals with sub-entire margin) and obdeltoid lip with entire margin and acute apex (vs. perpendicular to ovary lip with irregularly laciniate margin and retuse apex) ( Table 1).

Description:—Epiphytic herbs. Plants clustered. Stems enclosed in leaf bases, inconspicuous, 3.5–7 cm. Leaves 3–6, distichous-equitant, laterally compressed, ensiform, 13–22 cm × 0.6–1.1 cm, fleshy, veins slightly visible when dried, base articulate, apex acuminate. Inflorescences terminal, raceme, glabrous, 14–20 cm long; peduncle subterete, 2–3.5 cm, with a few lanceolate sterile bracts below; rachis 10.5–18 cm, ca. 1.5 mm in diam., densely covered with many minute whorled flowers; floral bracts ovate-lanceolate, ca. 2.2 mm × 0.7 mm, margin irregularly toothed, apex acuminate. Flowers in whorls, greenish to yellowish, ca. 1.3 mm across; pedicel with ovary ca. 1.7 mm long, shorter than the floral bracts. Dorsal sepal ovate-elliptic, 0.6–0.7 mm × 0.4–0.5 mm, acute; lateral sepals similar to dorsal sepals, 0.7–0.8 mm × 0.4–0.5 mm. Petals spreading, oblong, 0.6–0.8 mm × 0.3–0.5 mm, margin irregularly toothed, apex obtuse; lip entire, obovate-deltoid, spreading, ca. 0.5 mm in diam., base sub-truncate, slightly concave, margin entire, apex acute. Column short, erect, ca. 0.3 mm width; anther cap terminal, firmly attached to column apex, 2- locular; pollinia 4, in 2 pairs, waxy. Capsule ellipsoid, ca. 3 mm in diam.

Distribution and habitat:—So far, Oberonia integrilabris is only known from the type locality, Pu’er City in southern Yunnan Province, China. It grows as epiphyte on the tree branches in the secondary subtropical evergreen broad-leaved forest.

Etymology:—The specific epithet refers to the morphological character of the lip.

Phenology:—Flowers from August to September, fruiting from September to October.

Conservation status:—Currently, Oberonia integrilabris is known only from the type locality and the population size is about 20 mature individuals. The extent of occurrence (EOO) of the species cannot be estimated and its area of occupancy (AOO) is estimated to be 4 km 2, which belongs in the Critically Endangered category under criterion B2. The location is accessible and not officially protected. Native trees near this location were cut for planting other nonnative economic trees, such as Eucalyptus camaldulensis . Hence, the area of the habitat is undergoing a continuing decline. Based on the current information (one location with habitat in continuing decline and AOO less than 10 km 2), the new species can be assessed as Critically Endangered [B2ab(iii)] according to the IUCN Red List Categories and Criteria ( IUCN 2017).