AFRICAN

ORCHIDS

Nephrangis bertauxiana Szlach. & Olszewski, in Fl. Cameroun 36: 696 (2001).
Homotypic Synonyms:
Nephrangis filiformis var. bertauxiana (Szlach. & Olszewski) R.Rice, Prelim. Checklist & Survey Subtrib. Aerangidinae (Orchidac.): 40 (2005).
Description:
This species was described in 2001 from Gabon and is known only from the type collection. It was flowering in October and is easily distinguished from Nephrangis filiformis by the slightly larger, pendent flowers and especially by the longer spur that has a distinct knee-bend about halfway along its length where it suddenly becomes narrower.
Etymology:
The species is named in honour of Pierre Bertaux, conservator of the living collection of orchids in the Jardin du Luxembourg, in Paris.
Habitat:
In woodland trees on branches at elevations of 1500 meters.
Cultivation:
As given for the genus, cool growing epiphyte.
Distribution:
Cameroon to Gabon
References:
Angreacoid Orchids Stewart, Hermans and Campbell 2006; WCSP (2017). 'World Checklist of Selected Plant Families. 12.03.2017; http://apps.kew.org/wcsp/
Images:
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Nephrangis filiformis (Kraenzl.) Summerh., Kew Bull. 3: 302 (1948).
Homotypic Synonyms:
Listrostachys filiformis Kraenzl. in H.G.A.Engler (ed.), Pflanzenw. Ost-Afrikas, C: 158 (1895).
Angraecum filiforme (Kraenzl.) Schltr., Bot. Jahrb. Syst. 38: 21 (1905), nom. illeg.
Tridactyle filiformis (Kraenzl.) Schltr., Beih. Bot. Centralbl. 36(2): 148 (1918).
Description:
Epiphytic herb. Stem erect or pendent, slender, up to c. 35 cm long, usually branched, rooting at the base. Roots c. 3 mm in diameter. Leaves borne towards the stem apex, 1.5–9 cm × 1–2 mm, terete, needle-shaped, sometimes slightly recurved. Inflorescences arising along the stem from same nodes in successive years, up to 10 mm long, 1–6-flowered.Pedicel and ovary 3–5 mm long; bracts very short. Flowers translucent, light brown or greenish-brown, the lip creamy-white, the column green-brown and anther cap yellow. Sepals 1.5–2.7 × 1.5–2 mm, ovate, obtuse; the lateral sepals connate at the base and slightly oblique. Petals 1.7–2.3 × 0.4–0.6 mm, linear or narrowly lanceolate, acute. Lip 4–5 mm long with a basal concave claw and a 2-lobed, apical lamina c. 3 × 3.5–5 mm; spur 4–9 mm long, narrowly conical, obtuse. Column 0.6–1.2 mm long.
Habitat:
High-level epiphyte of high rainfall woodlands, including dense Cryptosepalum woodland and miombo.
Cultivation:
As given for the genus, warm to cool growing epiphyte.
Distribution:
Trop. Africa
References:
Orchids of East Africa Piers 1968; Flora of Tropical East Africa Vol 11 Orchidaceae Part 3 Cribb 1989; Orchids of Kenya Stewart & Campbell 1996; Angraecoid Orchids Stewart, Hermans and Campbell 2006; WCSP (2017). 'World Checklist of Selected Plant Families. 12.03.2017; http://apps.kew.org/wcsp/
Images:
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Botanical Drawing / Herbarium
Nephrangisfiliformis
Photograph copyright Swiss Orchid Foundation at the Herbarium Jany Renz Image used with kind permission.