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

10. Gastrodia longitubularis Q. W. Meng, X. Q. Song & Y. B. Luo, Nordic J. Bot. 25: 23. 2008.

海南天麻 hai nan tian ma

Plants 12-30 cm tall. Rhizome cylindric or digitate, 4-7 cm, 0.3-0.6 cm in diam., with several roots. Peduncle 10-24 cm, several noded; rachis 1-3.5 cm, 2-6-flowered; floral bracts brown, lanceolate-ovate, ca. 6 mm, apex acuminate. Flowers spreading or nodding, not resupinate, not opening widely, gray-brownish, lip tinged red or orange-red; pedicel and ovary 8-10 mm; pedicel not elongating in fruit. Perianth tube cylindric, 16-18 × 6-8 mm, lacking a deep sinus between lateral sepals, outer surface smooth; free portion of sepals ovate to suborbicular, 2-3 mm, apex acute; free portion of petals elliptic, ovate, or suborbicular, much smaller than sepal lobes, apex acute; lip simple, ovate or cordate, ca. 6 × 4-5 mm, glabrous, base clawed, margin entire or undulate, apex cuspidate; claw with a pair of subglobose calli; disk with 3-5 longitudinal grooves, with 2 longitudinal lamellae toward apex. Column 6-7 mm, with a pair of toothlike projections at apex; column wings narrow; column foot prominent. Capsule 12-15 mm. Fl. Apr-Jun, fr. May-Jul.

● Dense tropical forests; 800-1000 m. Hainan.


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