Oberonia insularis Hayata (1911: 310)

Li, Yu-Ling, Tong, Yi, Ye, Wen, Chen, Hong-Feng, Xing, Fu-Wu & Yi, Qi-Fei, 2017, Oberonia sinica and O. pumilum var. rotundum are new synonyms of O. insularis (Orchidaceae, Malaxideae), Phytotaxa 321 (2), pp. 213-218 : 216-217

Oberonia insularis Hayata (1911: 310) . ( Fig. 2 )

Type:— CHINA. Taiwan: Neng-gao Mountain, January 1907, T. Kawakami & U. Mori 6278 (holotype TI, photo!)

= Hippeophyllum sinicum Chen & Lang (1998: 69) . ≡ Oberonia sinica (S.C. Chen & K.Y. Lang) Ormerod (2003: 91) , syn. nov. Type:— CHINA. Gansu: Wudu county, Yu He, alt. 1600m, 6 June 1979, K.Y. Lang 1001 (holotype PE, not seen).

= Oberonia pumila S.S. Ying ex Ormerod (2002: 242) . Type:— CHINA. Taiwan: Hualien County, Taroko, alt. 800–1500 m, 28 December 1931, Suzuki s. n. (holotype TAI!).

= Oberonia pumilum S.S. Ying ex Ormerod var. rotundum Lin & Lin (2009: 330) . Type:— CHINA. Taiwan: Hualien County, between Lungshi and Lungchien, 25 May 2009, W.M. Lin s. n. (holotype TAI!)

Epiphytes. Rhizome creeping, 1–1.5 mm in diam., slender, covered by scalelike sheaths at nodes. Stem short, 1–2 cm. Leaves 3–6, distichous-equitant, laterally compressed, fleshy, ensiform or ovate-lanceolate, 6–19 × 1.5–5 mm, base articulate. Racemes terminal, about 3–5 cm long, many flowered. Bracts ovate lanceolate, 1–2 mm, margin slightly erose. Pedicel as long as the bracts. Flowers light green to pale yellowish brown, ca. 2 mm in diam., not resupinate. Sepals reflexed, ovate-elliptic, ca. 0.8–1 × 0.4 mm, acute; lateral sepals usually narrower than dorsal sepal. Petals reflexed, narrowly oblong in outline, ca. 0.7–1 × 0.15 mm; lip ovate-oblong in outline, 1.7 × 0.6 mm, margin slightly toothed, bilobed at apex; apical lobes divergent, narrowly lanceolate, 0.3–0.4 mm. Column short, ca. 0.2 mm; pollinia 4, in 2 pairs, without caudicles, waxy. Flowering May–June; fruiting July.

Illustration: — Lin (1987: 141), as H. pumilum ; Chen & Lang (1998: 69), as H. sinicum .

Distribution: — Oberonia insularis is endemic to China, currently known from Gansu, Guangxi, Guizhou, Hunan, Shaanxi, Taiwan and Yunnan ( Fig. 3 ).

Additional specimens examined: — CHINA. Guangxi: Leye, Dadao, 1184 m, 14 June 2015, Y. L. Li et al. LYL091 ( IBSC). Guizhou: Libo, Weng’ang, 17 July 2010, F. L. Chen et al. LB0450 ( IBSC). Hunan: Pingjiang, H. G. Ye et al. LXP10-6064 ( IBSC). Shaanxi: Zhenping, Baijia, 1420 m, 14 May 1986, L. Hu 1037 ( PE). Taiwan: Kaohsiung , Qishan , Nanxishan , 16 November 1940, Suzuki s. n. ( TAI) ; Hualien, Fenglin, 16 April 1939, collector unknown s. n. ( TAIF) ; Hualien, Yanhai Subprefecture, 15 August 1934, collector unknown s. n. ( TAIF) ; Hualien, 25 May 2009, W. M. Lin s. n. ( TAI) ; Hualien, Daduanya, ca. 900 m, 24 July 1936, collector unknown s. n. ( KPM) ; Hualien, 700 m, 16 June 2011, C. C. Hsu 1 ( TAI) ; Nantou, 29 September 2013, P. F. Lu 26025 ( TAIF) ; Nantou, Jenai Hsiang, 16 March 1990, H. J. Su 9315 ( HAST) ; Hsinchu, 18 June 1933, collector unknown s. n. ( TAIF) ; Hsinchu, ca. 1000 m, 17 May 1935, collector unknown s. n. ( KPM). Yunnan: Maguan, 20 June 2012, Y. Tong et al. TY039 ( IBSC) .

Figures

FIGURE 2. Oberonia insularis in the wild (Leye, Guangxi, China). A. Habitat; B. Plants; C. Flowers; D. Fruit. Photos taken by Y.L. Li and Y. Tong.

FIGURE 3. Distribution map of Oberonia insularis (·).