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Lady Susan's orchid (Pecteilis susannae)

Dlium Lady Susan's orchid (Pecteilis susannae)

Lady Susan's orchid (Pecteilis susannae) is a plant species in the Orchidaceae, a large to giant terrestrial orchid, growing upright, white flowers and large in karst to limestone landscapes and flowering December-January.

P. susannae has an erect, thick, leafy stem with a basal sheath and is oval in shape with a pointed tip and has no stalk.





Large flowers, stalks and ovaries 4-6 cm, shallow wings and hairless. Dorsal sepals erect, ovate to globose, 2.5-3 x 2-2.8 cm, blunt end rounded. Lateral sepals spread, broadly ovoid, slightly oblique, 2.5-4 x 1.2-2.2 cm, usually slightly longer than the dorsal sepals and blunt apex.

Calyx linear lance-shaped, 7-12 x 2.5 mm, lip irregularly ovate and 2.5-4.0 x 2.5-4.4 cm. Lateral lobes broad, subflabellate, 1.6-2.2 x 1.8-2.4 cm, entire lateral margin, apical margins frayed torn, Mid-lobe linear-oblong, 18-30 x 4-6 mm, moderately fleshy and intact. Straight to gradually curved forward, 6-13 cm x 3-5 mm and pointed end.

TAXON

Kingdom: Plantae
Phylum: Tracheophyta
Subphylum: Angiospermae
Class: Liliopsida
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Orchideae
Subtribe: Orchidinae
Genus: Pecteilis Raf. in Fl. Tellur. 2: 37 (1837)
Species: Pecteilis susannae (L.) Raf. in Fl. Tellur. 2: 38 (1837)

HOMOTYPIC SYNONYMS

Habenaria susannae (L.) R.Br. ex Spreng. in Syst. Veg., ed. 16. 3: 692 (1826)
Hemihabenaria susannae (L.) Finet in Rev. Gén. Bot. 13: 532 (1902)
Orchis susannae L. in Sp. Pl.: 939 (1753)
Platanthera susannae (L.) Lindl. in Gen. Sp. Orchid. Pl.: 295 (1835)

HETEROTYPIC SYNONYMS

Habenaria susannae Blume in Bijdr. Fl. Ned. Ind.: 402 (1825)
Platanthera robusta Lindl. in Gen. Sp. Orchid. Pl.: 295 (1835)
Platanthera susannae var. brevicalcarata Vuijk in Orchideeën 27: 132 (1965

PUBLICATIONS

Averyanov, I. (2010). The orchids of Vietnam illustrated survey part 2 subfamily Orchidoideae. Turczaninowia 13: 5-98.

Govaerts, R. (2003). World Checklist of Monocotyledons Database in ACCESS: 1-71827. The Board of Trustees of the Royal Botanic Gardens, Kew.

Lucksom, S.Z. (2007). The orchids of Sikkim and North East Himalaya: 1-984. S.Z.Lucksom, India.

Misra, S. (2004). Orchids of Orissa: 1-774. Bishen Singh Mahendra Pal Singh, Dehra Dun.

Ormerod, P. (2017). Checklist of Papuasian Orchids: 1-494. Nature & Travel Books, Australia.

Ormerod, P., Kurzweil, H. & Watthana, S. (2021). Annotated List of Orchidaceae for Myanmar. Phytotaxa 481: 1-262.

Pedersen, H.Æ., Kurzwell, H., Suddee, S. & Cribb, P.J. (2011). Flora of Thailand 12(1): 1-302. The Forest Herbarium, National Park, Wildlife and Plant Conservation Department, Bangkok.

Raskoti, B.B. (2009). The Orchids of Nepal: 1-252. Bhakta Bahadur Raskoti and Rita Ale.

Silveira, P., Schuiteman, A., Vermeulen, J.J., Sousa, A.J., Silva, H., Paiva, J. & De Vogel, E. (2008). The orchids of Timor: checklist and conservation status. Botanical Journal of the Linnean Society 157: 197-215.

Wu, Z. & Hong, D. (eds.) (2009). Flora of China 25: 1-570. Missouri Botanical Garden Press, St. Louis.

VERNACULAR NAME

English: Lady Susan's Orchid, Lady Susan, Susan orchid, Susanna's egret flower
Indonesian: Anggrek susana, Anggrek Kupu-kupu, Anggrek bangau
Java: Anggrek kuntul

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