4. Oberonia japonica (Maximowicz) Makino, Ill. Fl. Japan. 1(7): t. 41. 1891.
小叶鸢尾兰 xiao ye yuan wei lan
Malaxis japonica Maximowicz, Bull. Acad. Imp. Sci. Saint-Pétersbourg 22: 257. 1877; Oberonia formosana Hayata; O. makinoi Masamune.
Stem conspicuous, 1-2 cm. Leaves several, distichous-equitant at base, laterally compressed, linear-lanceolate, slightly falcate, 10-20(-30) × 2-3.5(-5) mm, somewhat thick, base not articulate, apex acute or acuminate. Peduncle subterete, 2-8 cm, rather slender, wingless; rachis many flowered; floral bracts ovate-lanceolate, 1(-2) mm, apex acuminate. Flowers yellowish green to reddish orange, less than 1 mm in diam.; pedicel and ovary 1-2 mm, often slightly longer than floral bracts. Sepals broadly ovate to ovate-elliptic, ca. 0.6 × 0.4 mm; lateral sepals often slightly larger than dorsal sepal. Petals suboblong or ovate, ca. 0.6 × 0.4 mm, apex obtuse; lip broadly oblong-ovate in outline, 0.6-0.8 mm, 3-lobed; lateral lobes obliquely spreading, ovate-triangular, entire; mid-lobe elliptic, broadly oblong, or suborbicular, conspicuously larger than lateral lobes, apex emarginate or sometimes with a small tooth in sinus. Fl. Apr-Jul. 2n = 30.
Epiphytic on trees or lithophytic on rocks in forests; 600-1000 m. N Fujian, Taiwan [Japan (Ryukyu Islands), Korea].