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This genus is accepted, and its native range is E. Himalaya to W. & Central Malesia.

[A-EM]
Distribution

With about 15 species, Pennilabium is distributed from northern India (Assam) through Thailand, Vietnam, and Malaysia to Indonesia and the Philippines.

Ecology

Pennilabium kidmancoxii J.J.Wood is an epiphyte in forests at 1300– 1500 m in Borneo. Pennilabium struthio is recorded as an epiphyte in forests at 200–500 m in Borneo.

General Description

Epiphytic herbs. Stem leafy. Leaves few, clustered, ligulate or linearelliptic, often subfalcate, often twisted at base, unequally bilobed, fleshy, to 11 × 3 cm. Inflorescence lateral, emerging from base of leaf-sheaths, racemose, 3–8 cm long; rachis complanate, with one or two distichously arranged flowers opening in succession; floral bracts distichous. Flowers lasting for a day or two, white, cream, yellow or orange. Sepals and petals subequal, 1–2 cm long. Petals sometimes toothed. Labellum trilobed, rigidly attached to base of column, spurred, internal callosities absent, side lobes either well developed and truncate or reduced to ear-like lobes, when present often fimbriate or toothed; midlobe fleshy and solid or reduced to a fleshy lobe; spur ecallose and aseptate, often with raised edges near entrance. Column compressed dorsally, column foot absent; pollinia two, nearly round, entire, stipe broader below pollinia, often spatulate, 3–5 times the diameter of the pollinia; rostellar beaked; stigma covering almost the entire front side of column.

[A-EM]
Distribution

Spongiola is monospecific and endemic to Borneo (Sabah only).

Ecology

This species is epiphytic on the branches of small trees in damp, shaded and humid situations in riverine forest on limestone and sandstone ridges at elevations at 300–500 m.

General Description

Pendent epiphytic herbs. Stem leafy, obscured by persistent leaf bases, producing roots at the nodes. Leaves oblong or oblongelliptic, apex obtuse and asymmetric, coriaceous. Inflorescence lateral, racemose, occasionally branched, pendent, much longer than leaves, up to about 25-flowered, usually only five or six open at a time, progressing downward in succession, sometimes opening in middle of raceme; floral bracts minute, ovate. Flowers resupinate, short-lived, each lasting one day only, sepals and petals semi-translucent pale yellow to yellowish green, margins and tips semi-translucent whitish, labellum white with pale to dark purple spots, side lobes flushed purple on inner surface, spur pale yellow. Sepals and petals free, oblong-elliptic, obtuse, spreading. Labellum rigidly attached to column base, trilobed, spurred, ecallose, side lobes auriculate, midlobe longer than side lobes and resembling a sponge-like pouch, hollow near mouth of spur, solid below, shallowly concave on underside, papillose-verrucose; spur 2 mm long, conical, obtuse, aseptate. Column without foot; anther cap terminal, operculate, apex acuminate, sometime obscurely tridentate, pollinia two, ovoid, entire, stipe spatulate, broadened below pollinia, viscidium cucullate; rostellum prominent. Ovary with pedicel terete, straight.

[A-EM]
Use

No uses have been reported for Pennilabium, and it is not commonly cultivated.

[A-EM]
Use

No uses have been reported for Spongiola, and it is not commonly cultivated.

Native to:

Assam, Borneo, China South-Central, East Himalaya, Jawa, Malaya, Philippines, Sulawesi, Sumatera, Thailand, Vietnam

Pennilabium J.J.Sm. appears in other Kew resources:

First published in Bull. Jard. Bot. Buitenzorg, sér. 2, 13: 47 (1914)

Accepted by

  • Govaerts, R. (2003). World Checklist of Monocotyledons Database in ACCESS: 1-71827. The Board of Trustees of the Royal Botanic Gardens, Kew.
  • Pridgeon, A.M., Cribb, P.J., Chase, M.C. & Rasmussen, F.N. (2014). Genera Orchidacearum 6: 1-544. Oxford University Press, New York, Oxford.

Aeridinae: e-monocot.org
All Rights Reserved

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0