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FOC | Family List | FOC Vol. 25 | Orchidaceae | Thrixspermum

3. Thrixspermum tsii W. H. Chen & Y. M. Shui, Brittonia. 57: 55. 2005.

吉氏白点兰 ji shi bai dian lan

Stems arching or pendulous, stout, terete, slightly flattened, 30-40 cm, 5-6 mm wide; internodes 1.5-2.5 cm. Leaves distichous, thick and fleshy, oblong, 6-12 × 1.9-2.2 cm, unequally obtusely bilobed, sheathing and amplexicaul at base. Inflorescence racemose, extra-axillary, arching, 1-3-flowered; rachis flattened, 1.5-2.5 cm; floral bracts broadly triangular, 2.5-3 × 3.5-4 mm, lax and distichous, conduplicate-concave, acute, fleshy, persistent. Flowers lasting only 1 day, not opening widely, white, becoming yellowish, lip with a golden yellow disk, anther cap whitish yellow, glabrous; pedicel and ovary greenish, ca. 1.5 cm. Dorsal sepal elliptic, ca. 15 × 6 mm, 5-veined, obtuse; lateral sepals somewhat obliquely elliptic, 14-15 × ca. 6 mm, 5-veined, obtuse with a short tip. Petals oblong-ovate, 11-12 × ca. 6 mm, 5-veined, acute; lip slightly pouched, widely ellipsoid, ca. 8 × 12 mm; lateral lobes abruptly narrowed to an acute apex, slightly curved forward; mid-lobe elongating into a broadly ligulate blade, ca. 3 mm, ca. 1.5 mm high, fleshy, densely hairy, apex truncate, mucronate; disk with a single, narrow horizontal callus. Column short, foot ca. 3 mm; anther cap ca. 1.8 mm wide. Fl. May-Jun.

● Epiphytic on tree trunks and branches, lithophytic on rocks, in shrublands and secondary forests on limestone; 700-1500 m. Yunnan.


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