Tuberolabium kotoense Yamamoto, Bot. Mag. (Tokyo). 38: 209. 1924.管唇兰 guan chun lan

Saccolabium kotoense (Yamamoto) Yamamoto.

Stems short, indistinct. Leaves 2-7, ± basal; blade oblong or oblong-elliptic, 6.5-16 × 2-4 cm, rather fleshy or thickly leathery, apex obtuse and slightly bilobed. Inflorescence pendulous, 10-15 cm, densely many small flowered; peduncle and rachis 4-5 mm in diam.; floral bracts broadly ovate-triangular, 2-3 mm, sometimes denticulate toward apex. Flowers white, often tinged with yellow, lip lateral lobes purplish, mid-lobe white with a central purplish patch and 2 purple basal swellings, spur white or pale green, sometimes with purplish stripes or spots, column purplish, rostellum white; pedicel and ovary 5-8 mm. Dorsal sepal obovate-elliptic, 4.5-5.5 × 2.2-3 mm, concave, obtuse; lateral sepals obliquely obovate, 5-6 × 2.5-4 mm, obtuse. Petals oblong-spatulate, ca. 5 × 1.8 mm, obtuse; lip spurred, ca. 3 mm, 3-lobed; lateral lobes erect, subquadrate, 1-1.5 cm, obtuse to rounded; mid-lobe thickly fleshy, adaxially slightly depressed at base and with 2 swellings partly covering spur entrance; spur conic, laterally compressed, ca. 2 mm. Column 1-1.5 mm; rostellum ca. 0.3 mm. Fl. Dec-Feb. 2n = 30*.

● Epiphytic on tree trunks in thickets. S Taiwan.