Eulophia petersii (Rchb.f.) Rchb.f.
  • Flora


Cite taxon page as 'WFO (2020): Eulophia petersii (Rchb.f.) Rchb.f. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0000960168. Accessed on: 02 Jun 2020'

Morphology

Sepals 16–30 × 2–6 mm, oblanceolate, acuminate or apiculate, curled back at the tips, the dorsal erect, the laterals spreading.

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    Sepals and petals green, veined with purple-red; lip white, marked with red.

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    Lip 14–27 × 8–17 mm across the side lobes when flattened, 3-lobed, side lobes erect, mid-lobe subquadrate, 4–10 mm long, 6–14 mm wide, with a callus of 3 fleshy, erose ridges.

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    Petals 16–22 × 4–8 mm, oblanceolate or oblong, apiculate, curled back at the tips.

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    Inflorescence up to 3 m tall, usually with 3–7 branches; peduncle stout with 4 bracts.

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    Leaves 2–4, usually 2, erect, somewhat conduplicate, 14–95 × 1–6 cm, linear-ligulate, the edges serrate, succulent, drying ribbed.

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    Bracts up to 18 mm long, lanceolate, acuminate.

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    Pedicel and ovary 2–3 cm long.

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    Capsule 4–5 cm long, pendent, ellipsoid.

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    Column 8–9 mm long, lacking papillae; the foot 1–2 mm long.

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    Perennating organs pseudobulbous, mostly above ground, 4–23 × 1–4 cm, ovoid, conical or cylindrical, with 4–6 nodes, green at first, turning yellow and ribbed; roots stout, 4–5 mm in diameter.

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    Spur 4–6 mm long, subcylindrical, usually incurved.

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    Robust terrestrial herb.

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    Terrestrial herb, up to 200 mm tall. Leaves with serrulate margins. Petals acuminate, narrowly oblong with apices often circinnate. Flowers green, marked with purplish brown, midlobe of lip white with crests purplish red to pink.

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    Plants with largely aerial pseudobulbs bearing leaves near the apex and broad caducous sheaths below, pseudobulbs linked by short, cylindrical, subterranean portions 5-10 mm in diameter; leaves 2-4 (rarely 5), stiffly erect to arcuate-spreading, thick-tissued, deeply sulcate adaxially, up to 400 x 44 mm, margins with scabrous irregular enations 0.3-0.5 mm high; flowering stem unbranched or branched, 0.9-2 m tall. Inflorescences lax, several-flowered. Flowers: sepals dark green and purple, petals green, lip side lobes green, midlobe white tinged pink. Sepals spreading, widely diverging, often circinnate apically; median sepal (19-) 23-28 (-33) mm long, lorate to narrowly oblanceolate, apiculate; lateral sepals similar. Petals slightly spreading with circinnate apices, slightly shorter than sepals, narrowly obªlong, acute. Lip 3-lobed, crests consisting of laªmellae rising to more than 1.5 mm tall centrally, often somewhat dissected, main veins elsewhere with very low broad ridges; midlobe crispate; side lobes elliptic; mentum 2-8 mm long; spur cylinªdrical, 2-8 mm long. Gynostemium 10-13 mm long, operculum bilobed.

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    Habitat

    Valley bushveld and thorn savanna.

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    Sheltered to quite exposed places in valley bushveld and thorn savanna, often forming large clumps.

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    Distribution

    KwaZulu-Natal, Swaziland, the higher parts of Mpumalanga and Northern Province, and also widespread in Zaire and the eastern half of Africa as far north as Arabia.

  • Provided by: [A].e-Flora of South Africa
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      Bibliography

     Information From

    e-Flora of South Africa
    e-Flora of South Africa. v1.21. 2018. South African National Biodiversity Institute. http://ipt.sanbi.org.za/iptsanbi/resource?r=flora_descriptions&v=1.21
    • A All Rights Reserved
    Orchidaceae
    • B CC0 1.0 Universal (CC0 1.0).
    Plants Of the World Online Portal - FZ
    https://www.kew.org/science/who-we-are-and-what-we-do/strategic-outputs-2020/plants-of-the-world-online
    http://www.plantsoftheworldonline.org/terms-and-conditions
    • C
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • D CC0 1.0 Universal (CC0 1.0).