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

13. Ponerorchis taiwanensis (Fukuyama) Ohwi, Acta Phytotax. Geobot. 5: 146. 1936.

台湾小红门兰 tai wan xiao hong men lan

Orchis taiwanensis Fukuyama, Bot. Mag. (Tokyo) 49: 290. 1935; Chusua taiwanensis (Fukuyama) P. F. Hunt; Orchis taitungensis S. S. Ying; O. taitungensis var. alboflorens S. S. Ying; Ponerorchis taitungensis (S. S. Ying) S. S. Ying; P. taitungensis var. alboflorens (S. S. Ying) S. S. Ying.

Plants 9-25(-40) cm tall. Tubers ellipsoid or subglobose, 5-30 × 5-20 mm. Stem green with purple striations or purple, ca. 12.5 cm, with 1 or 2 tubular sheaths at base, 2-5-leaved. Leaves cauline, alternate, widely spaced, green, lacking purple spots, linear to linear-lanceolate, 4-9(-15) × 0.4-2 cm, becoming smaller and bractlike above, glabrous, apex acuminate. Inflorescence erect, green with purple striations or purple, 5-12 cm, glabrous; rachis 3-10 cm, 5-20-flowered; floral bracts erect, green or purple, lanceolate, 10-15 mm, almost as long as ovary, apex acuminate. Flowers secund, pale purple or rose, rarely white, medium-sized; ovary purple or green spotted with purple, cylindric, 10-15 mm including pedicel, glabrous. Dorsal sepal erect, elliptic, concave, 5-7 × 2.5-4 mm, apex obtuse; lateral sepals ovate to oblong, oblique, 6-7 × 3-3.5 mm, apex obtuse. Petals erect, forming a loose hood with dorsal sepal, obliquely elliptic, 5-6 × 2.5-4 mm, margin ciliate, apex obtuse; lip ovate-orbicular, 9-15 × 8-12 mm, spurred, 3-lobed near middle, margin subentire to irregularly serrate, disk tinged white or pale yellow at base, with red or purple dots or patches; lateral lobes transversely oblong to subsquare, oblique, ca. 1.8 × 2 mm, apex obtuse, truncate; mid-lobe suborbicular, 4-5.5 × 4-6 mm, usually broader than long, margin irregularly undulate-serrate, apex obtuse or slightly emarginate; spur pendulous, cylindric, 12-20 mm, ca. as long as to slightly exceeding ovary, inside pubescent, apex obtuse. Fl. Jul-Aug.

● Cliffs, crevices of rocks, alpine grasslands; 1500-3400 m. C and S Taiwan (Hualian, Nantou, Taidong).


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