2. Renanthera imschootiana Rolfe, Bull. Misc. Inform. Kew. 1891: 200. 1891.
云南火焰兰 yun nan huo yan lan
Stems to 1 m, with many rather contiguous and distichous leaves. Leaf blade oblong, 6-8 × 1.3-2.5 cm, leathery, somewhat obliquely rounded-bilobed. Inflorescence axillary, to 1 m, usually branched, many flowered; peduncle and rachis slender; floral bracts broadly ovate, ca. 2 mm, apex obtuse. Flowers: sepals and petals dull yellow, spotted with red on apical half of petals and tinged with red on lateral sepals, lip red with whitish markings, spur yellow with red tip, column deep red; pedicel and ovary reddish, 2-2.3 cm. Dorsal sepal subspatulate-oblanceolate, ca. 24 × 5 mm, ± acute; lateral sepals obliquely elliptic-ovate, ca. 30 × 10 mm, base contracted into a claw ca. 6 mm, margin undulate, apex obtuse. Petals narrowly spatulate, ca. 20 × 4 mm, obtuse and thickened; lip 3-lobed; lateral lobes erect, deltoid, ca. 3 mm, exceeding column, base with 2 membranous lamellae, apex acute; mid-lobe ovate, ca. 4.5 × 3 mm, acute, strongly recurved, base with 3 fleshy calli; spur ca. 2 mm, obtuse. Column cylindric, ca. 4 mm. Fl. May. 2n = 38.
Epiphytic on tree trunks in forests along valleys; below 500 m. S Yunnan [NE India (Manipur), ?Myanmar, Vietnam].