Volume 12 > Part 3 > Year 2022 > Page 721 > Orchidaceae > Crepidium

6. Crepidium calophyllum (Rchb.f.) Szlach.wfo-0000926829

Fragm. Florist. Geobot., Suppl. 3: 125. 1995; Thaithong, Thai Orchids [in Thai]: 276, colour photos on pp. 276–277. 2000; Seidenf., Contr. Orchid Fl. Thailand XIII: 18. 1997; S.C.Chen & J.J.Wood in Z.Y.Wu et al. (eds.), Fl. China 25: 232. 2009.— Microstylis calophylla Rchb.f., Gard. Chron., new ser., 12: 718. 1879; Ridl., J. Linn. Soc., Bot. 24: 340. 1888.— Malaxis calophylla (Rchb.f.) Kuntze, Revis. Gen. Pl. 2: 673. 1891; Seidenf. & Smitinand, Orchids Thailand: 149, 761. 1959–1965; Seidenf., Bot. Tidsskr. 65: 327, fig. 8. 1970; Dansk Bot. Ark. 33(1): 54, fig. 42. 1978; Opera Bot. 114: 147. 1992; Seidenf. & J.J.Wood, Orchids Penins. Malaysia Singapore: 223, fig. 94c–d. 1992; N.Pearce & P.J.Cribb, Fl. Bhutan 3(3): 215. 2002; Aver., Turczaninowia 16: 128, fig. 63e. 2013. Fig. 383; Plate LVIII: 4.

Accepted Name : This is currently accepted.

Synonyms & Citations :

Description : Terrestrial plant with a condensed rhizome bearing an erect, pseudobulbous, 6.5–25 cm tall flowering shoot distally. Pseudobulbs (oblongoid-)ovoid to terete from a fusiform base, 2–7 cm long, 0.4–1.2 cm in diameter. Leaves 3–5, ascending to spreading or erect, sessile to short-petiolate; petiole up to 1 cm long; lamina pale (greenish) brown to dull brownish purple with white to light green (often spotted) marginal bands, ovate to ovate-lanceolate, acuminate, 1–7.5 by 0.5–4 cm, glabrous, margins undulate. Inflorescence 5.5–18 cm long, subdensely 10- to many-flowered; peduncle 2.5–10 cm long; bracts reflexed, linear-triangular to lanceolate, acuminate, 1.5–5.5 mm long. Flowers greenish yellow or pale yellow with purplish sepals and petals, 4–5 mm in diameter. Sepals with revolute margins; dorsal sepal (lanceolate-)oblong to ovate, obtuse, 4–5.5 by 1.5–2.5 mm, up to twice as long as labellum auricles; lateral sepals obliquely and broadly elliptic to ovate, rounded, 3–4 by 1.8–3 mm. Petals linear-ligulate, truncate to retuse, 4–6 by 0.5–1 mm. Labellum (nearly) flat, 4.5–7.5 by 3–4.5 mm, longer than wide, more or less obovate (not constricted at the middle), strongly sagittate-auriculate at base, distally (rounded-) truncate with a small triangular cleft apex; cavity suborbicular to obovate (to linear-lanceolate) in outline, bordered by a more or less horseshoe-shaped ridge; auricles obliquely to falcately triangular, acute to obtuse, 2–4 by 1–2 mm. Column 1–2.2 mm long; staminodes oblong. Ovary 3–4.5 mm long.

Thailand : NORTHERN: Mae Hong Son, Chiang Mai, Lamphun (Doi Khun Tan); NORTH-EASTERN: Phetchabun (Nam Nao), Loei (Phu Luang), Buengkan (Phu Wua); SOUTH-EASTERN: Trat (Ko Kut); PENINSULAR: Chumphon (Langsuan), Songkhla (Ton Nga Chang).

Distribution : Nepal, NE India, Bangladesh, Myanmar, China (Hainan, Yunnan), Cambodia, Vietnam, Peninsular Malaysia (type?), Borneo.

Ecology : Crepidium calophyllum grows in sandy, humus-rich soil in hill evergreen forests at 550–1,500 m alt. Flowering: May–June.

Notes: In living condition, this species is easily recognized by its leaves having a markedly lighter band along the slightly wavy margins, whereas this feature is rarely preserved in herbarium specimens. Variation in labellum morphology is considerable, cf. Seidenfaden (1978: fig. 42).