AFRICAN

ORCHIDS

Angraecum pungens Schltr., Bot. Jahrb. Syst. 38: 163 (1906).
Homotypic Synonyms:
Angraecopsis pungens (Schltr.) R.Rice, Prelim. Checklist & Survey Subtrib. Aerangidinae (Orchidac.): 21 (2005).
Pectinariella pungens (Schltr.) Szlach., Mytnik & Grochocka, Biodivers. Res. Conservation 29: 19 (2013).
Heterotypic Synonyms:
Mystacidium arthrophyllum Kraenzl., Ann. K. K. Naturhist. Hofmus. 30: 64 (1916).
Angraecum arthrophyllum (Kraenzl.) Schltr., Repert. Spec. Nov. Regni Veg. Beih. 33: 312 (1925).
Description:
Stems erect or pendant, up to 50 cm long, 2–3 mm in diam. Leaves oblong-ovate, apex acute or acuminate, narrow at the base, 22–32(–44–48) + 3.9–5(–6–7) mm, curved, with a short, sharp, terminal point at the apex, internodes 5–9 mm long. Roots elongate, up to 1 mm in diam. Inflorescences 1flowered; flowers 13.5–16 mm long, bract acute, 2.1–4 + 1.8– 3 mm. Dorsal sepal 7.3–9.2 + 2.2–3.1 mm, narrowly elliptic to obovate, subacute, 5- to 7-veined, adaxially concave, margins slightly recurved in the apical half. Lateral sepals 7.3– 9.8 + 2–3.1 mm, narrowly elliptic to obovate, 5- to 7-veined, adaxially concave, margins slightly recurved in the apical half. Petals 6.5–9 + 1.6–2.3 mm, narrowly obovate-elliptic, 3- to 5-veined, adaxially concave, margins slightly recurved in the apical half. Lip 4.3–5.2 + 5–7 mm, concave, suborbicular or transversely ovate, shortly acuminate; spur 4–7 + 1 mm, straight, subcylindric and pointed. Pedicel and ovary 6–8.3 mm long. Column short, 1.5–2 + 1 mm. Pollinia 2, pyriform.
Habitat:
Angraecum pungens is found in dense lowland forests, downstream from waterfalls, growing on fallen branches near watercourses upstream from areas with mangrove vegetation, and on periodically flooded marshes with Oxystigma mannii (Baill.) Harms, between 50 to 1,800 m elevation. In southern Cameroon, this species grows near the Atlantic Ocean, occurring on Terminalia catappa L.
Phenology:
Flowering occurs nearly throughout the year, except in March.
Cultivation:
Heavy shade and high humidity. Because of the pendent habit, this species looks better if mounted on bark, but the fine roots quickly dry out. If it is not possible to keep the humidity high, plants can be grown in a pot and allowed to fall over the edge, warm to cool growing epiphyte.
Distribution:
Cameroon, Equatorial Guinea (Bioko), Nigeria, Zaire.
References:
African Orchids in the Wild and Cultivation La Croix 1997; Angraecoid Orchids Stewart, Hermans and Campbell 2006; Taxonomic Revision of the Continental African Species of Angraecum Section Pectinaria (Orchidaceae) Systematic Botany (2014), 39(3): pp. 725–739, 2014;WCSP (2017). 'World Checklist of Selected Plant Families. 28.01-2017; http://apps.kew.org/wcsp/
Images:
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Photograph Gilles Grunenwald. Image used with kind permission. Photograph Gilles Grunenwald. Image used with kind permission. Photograph Gilles Grunenwald. Image used with kind permission. Photograph Gilles Grunenwald. Image used with kind permission. Photograph Gilles Grunenwald. Image used with kind permission. Photograph Gilles Grunenwald. Image used with kind permission.