狭叶金石斛 xia ye jin shi hu

Desmotrichum angustifolium Blume, Bijdr. 330. 1825; Callista angustifolia (Blume) Kuntze; Dendrobium angustifolium (Blume) Lindley; Ephemerantha angustifolia (Blume) P. F. Hunt & Summerhayes.

Rhizome creeping, 3-4 mm in diam., internodes 5-10 mm. Pseudobulbs golden yellow, slightly compressed, fusiform, 3-3.5 cm × 4-7 mm. Stems pendulous, golden yellow, slender, many branched. Leaf blade narrowly lanceolate, 7-10 × 0.8-1.2 cm, leathery, apex acute and slightly bilobed. Inflorescence abaxial, often 1-flowered, base with 2 or 3 tufted scalelike sheaths. Flowers only lasting half a day, thinly textured; sepals and petals pale yellow with brownish purple stripes, lateral lobes of lip purple with whitish margins, mid-lobe orange; pedicel and ovary ca. 7 mm. Dorsal sepal ovate-elliptic, ca. 5.5 × 3 mm, obtuse; lateral sepals obliquely ovate-triangular, broader and larger than dorsal sepal, base very oblique and broad, apex acute; mentum borne at an acute angle to ovary, ca. 7 mm. Petals ovate-lanceolate, ca. 5 × 2 mm, acute; lip 10-12 × 4-5 mm, with a long claw at base, 3-lobed; lateral lobes erect, apex rounded; mid-lobe subobovate, ca. 5 mm, entire, deeply 2-lobed, apiculate in sinus; lobules subobovate-oblong; disk with 2 lamellae extending from base to base of mid-lobe. Column ca. 3 mm, stout. Fl. Jun-Sep.

Epiphytic on tree trunks in forests; ca. 1000 m. SW Guangxi, Hainan [Indonesia, Malaysia (Peninsular), Thailand, Vietnam].