生活型

herb

形態特徵

• Plant including flower 2.5~5 cm tall. Tuberoids white, ovoid, usually < 3 mm in diameter, minutely scaly-pilose. Rhizomes erect, tapering downward, pilose, the collar (the region at the root/stem interface located directly below the stem bract) is often slightly swollen. Stem usually 1~ 2 cm long having a tubular stem bract at base, buried in debris, glabrous.
• Leaves cordate, usually 1 cm in diameter, cuspidate at apex, entire, pale-green and not showy on upper surface, while whitish-green and showy on lower surface, glabrous on both sides, central vein on lower surface slightly keeled and whitish.
• Peduncle purplish-red, varying 2~4.5 cm long. Pedicel and ovary purplish-red, 4 mm long, cylindrical. Flowers solitary, purplish-red, ca. 1.1 cm long and 1.3 cm across; bracts purplish-red, linear-lanceolate, 3.5 mm long, acuminate; upper sepal concave and arched on the upper part of lip, spatulate, 10 mm long, 3 mm wide, acute; lateral sepals not connate at base, filiform, 5.5 mm long, base dilated ca. 0.7 mm wide; petals filiform, usually 10 mm long, spreading. Lip tube-like, lower limb margins incurved and overlapping to embrace column, anterior limb recurved downward forming a curved tube with an opening about 3.8 mm across and 6 mm long, minutely serrate along front margins, rhombate-trianglular in outline and 6 x 7.2 mm when lip expanded; disc dark purplish-red, glabrous, outer surface of lip with many darker-red markings, basal part forming 2 white horn-like spurs; spurs 1 mm long. Column dark-red, forming a protruding callus-like structure in front, callus tinged with white; anthers adnate on column, anther connective membranous, covering pollinia inside; pollinia 4, in 2 pairs, powdery, yellow; rostellum circular; stigma slightly protruding.

物候

Flowering time: July.

分布

• 台灣 : This helmet orchid has so far only been found in Shyrpishan ( 石壁山), Yunlin Co. at an elevation of 1200 m, and grows on mossy slopes in close proximity to bamboo plantations.

引證標本

Weimin Lin s. n. (holo TAI 268952, Shyrpishan, Yunlin Co.).

引用文獻

• Tsan-Piao Lin and Wei-Min Lin, Taiwania 54(4): 329. 2009.