生活型

herb

形態特徵

• Stems short or obscure.
• Leaves 2-7, rather closely spaced, elliptic, oblong to linear-oblong, 7-16 cm long, 1-4 cm wide, apex obtuse or obliquely 2-lobed, base cuneate, articulated.
• Peduncles and rachis 10- 15 cm long, 5 mm in diam.; bracts triangular, 2-2.5 mm long, entire or toothed toward apex; pedicel and ovary 5-7 mm long. Flowers numerous, white, often tinged with pale yellow, perianth subspreading, 9 mm in diam.; dorsal sepal obovate, 4.5-5.5 mm long, 2.5-3 mm wide, obtuse; lateral sepals obovate or elliptic, 5-6 mm long, 3-4 mm wide, obtuse at apex, often apiculate; petals obliquely spatulate, 4.5-5 mm long, 1.8-2 mm wide, obtuse; lip mainly a fleshy sac, sac 4-5 mm long, enlarged, 3-lobed at apex, tapering and spur-like at base, lateral lobes erect or ascending, purplish, squarish-orbicular to rectangular, 1-1.5 mm long, obtuse to rounded at apex, midlobe enlarged from saccate spur and protruding toward apex, white, with a purple patch on upper surface at center, composed of solid fleshy tissue, disc slightly depressed at center forming a raised parabolic boundary enclosing depression, depression with 2 raised purple mounds adnate posteriorly to inner wall of lateral lobes and partly blocking mouth of spur; spur pale yellow to pale green, sometimes with purple stripes or spots; column purplish, 1-1.5 mm long, base slightly dilated and continuous into back wall of spur; anther cap white, broadly oval, 1 mm long, 1-locular, with 2 thin membranaceous appendages covering pollinia; pollinia ovoid, 0.8 mm long, undivided or sometimes obscurely sulcate near base, stipe slender, 0.5 mm long; viscidium ovate to clavate, 0.4 mm long; rostellum white.
• Capsules cylindric, to 4 cm long and 8 mm thick.
• Because of the complicated structure of the lip and column, there still exist some taxonomic and nomenclatural problems in <i>Tuberolabium</i>. According to Wood (1990), <i>T. kotoense</i> is endemic to Taiwan (Lanyu Is.) Closely related species in <i>Tuberolabium</i> and <i>Parapteroceras</i> can be found in the Philippines and Thailand.

分布

• 台灣 : Lanyu Is., in thickets in mountainous regions.

引證標本

TAITUNG: Lanyu Is., Sasaki s. n. May 1924; Su 9239*.

參考文獻

• SU, Horng-Jye, Flora of Taiwan, second edition 5: 1058. 2000.  (Fl. Taiwan 2nd edit.)