Cardiochilos williamsonii P.J.Cribb, Kew Bull. 32: 184 (1977).
Plant small, erect, up to 12 cm high, with a stem8 cm long and with long, thick roots emanating from the lower part. Leaves in 2 rows, spreading, falcate, linear, unequally bilobed at the apex, 4–8 cm long, 3–6 mm wide. Inflorescences 3–4 cm long, 1- or 2-flowered; peduncle 1–2.5 cm long; bracts ovate to obovate, 2–3.5 mm long; pedicel with ovary scabrid, 7–13 mm long. Flowers pale green to ochreous orange; dorsal sepal elliptic, obtuse, 4 mm long, 2.2 mm wide; lateral sepals connate, obliquely falcate, elliptic, obtuse, 4.5 mm long, 2.5 mm wide; petals oblong-lanceolate, acute, 4 mm long, 2 mm wide; lip auricled at the base, cordate, shortly apiculate, 4 mm long and wide; spur slightly undulate, narrowly cylindric from a wide mouth, 13–16 mm long.
Named in honour of the dentist Graham Williamson who made many interesting finds in Zambia and collected this species in Malawi in 1968.
In montane and submontane forest,on Philippia and other shrubs, usually amongst lichens; 2200–2500 m; flowering in April.
As given for the genus.
SW. Tanzania to N. Malawi
World Checklist of Monocotyledons. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/monocots/ accessed 21.03.2017
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