Bulbophyllum oreonastes Rchb.f.

Orchidaceae, V. S. Summerhayes. Flora of West Tropical Africa 3:1. 1968

Morphology Reproductive morphology Flowers

Flowers yellow, orange, brown or reddish brown.

Orchidaceae, I. la Croix and P.J. Cribb. Flora Zambesiaca 11:1. 1995

Morphology General Habit

Epiphytic or lithophytic herb.

Vegetative Multiplication Rhizomes

Rhizome 0.8–3 mm in diameter.

Vegetative Multiplication Pseudobulbs

Pseudobulbs 0.7–4 cm apart on the rhizome, 2-leaved, 0.4–3.5 × 0.4–1.2 cm, ovoid, ellipsoid or suborbicular, somewhat 4-angled.

Morphology Leaves

Leaves with a petiole-like base up to 8 mm long; lamina 0.6–8.2 × 0.4–2 cm, linear-lanceolate to elliptic.

Morphology Reproductive morphology Inflorescences

Inflorescence 1.5–17.5 cm long, 5–36-flowered; peduncle 0.7–6.5 cm long, glabrous, 2–5-sheathed; rhachis up to 16 cm long, often somewhat nodding, enlarged and flattened, 4-angled in cross section, with the flowers borne in channels on opposite sides.

Morphology Reproductive morphology Flowers

Flowers distichous, spreading, many open at a time, not opening widely; sepals and petals yellow or orange, usually with red-purple stripes, lip deep orange or purple.

Morphology Reproductive morphology Flowers Pedicel and Ovary

Pedicel and ovary 1.8–3 mm long.

Morphology Reproductive morphology Inflorescences Bracts

Bracts 3–7 mm long, triangular, spreading, scarious.

Morphology Reproductive morphology Flowers Calyx

Dorsal sepal 3–6.2 × 1–1.8 mm, ovate, not recurved; lateral sepals 3–7 × 1.5–3.2 mm, triangular, sometimes slightly recurved.

Morphology Reproductive morphology Flowers Corolla

Petals 1–3 × 0.2–0.6 mm, obliquely linear-lanceolate.

Morphology Reproductive morphology Flowers Labellum

Lip 1.4–2.5 × 0.6–1.2 mm, elliptic or oblong, recurved about half-way, lip underside swollen at base and apex, the 2 parts separated by a traverse furrow.

Morphology Reproductive morphology Flowers Androecium Stamens Anthers

Anther with a slightly concave, truncate or retuse protrusion which overtops the front margin.

Morphology Reproductive morphology Flowers Pollinia

Pollinia 4, ± orbicular but flattened, the larger about twice as long as the smaller.

Orchidaceae, V. S. Summerhayes. Flora of Tropical East Africa. 1968

Morphology General Habit

A small epiphytic herb with a slender creeping rhizome 1.5 mm. diameter.

Vegetative Multiplication Pseudobulbs

Pseudobulbs 2- leaved, ellipsoid to ovoid or cylindrical, four-angled, 0.8–3.2 cm. long, 0.4–0.9 cm. diameter, up to 4 cm. apart on rhizome.

Morphology Leaves

Leaves coriaceous, suberect, oblong-elliptic, rounded, 2–6 cm. long, 0.5–1.4 cm. broad.

Morphology Reproductive morphology Inflorescences

Inflorescence erect, up to 15 cm. long, 8–16-flowered; peduncle terete; rhachis fleshier, winged on each side of pedicel, wings somewhat denticulate; bracts spreading, distichous, ovate, acute, 5 mm. long, olive-brown.

Morphology Reproductive morphology Flowers

Flowers red-brown or orange-yellow, ± striped maroon, lip yellow or red-brown.

Morphology Reproductive morphology Flowers Calyx

Dorsal sepal lanceolate, acute, 4.6–6.3 mm. long, 1.6–2.1 mm. broad; lateral sepals ovate, acute, 4.6–6.6 mm. long, 2.5–3.8 mm. broad.

Morphology Reproductive morphology Flowers Corolla

Petals linear, rounded, 2–3.4 mm. long, 0.4–0.75 mm. broad.

Morphology Reproductive morphology Flowers Labellum

Lip auriculate at base, bilaterally flattened, apically bulbous, 2–3.3 mm. long.

Morphology Reproductive morphology Flowers Column

Column 0.8 mm. long; stelidia oblong, obtuse.

Habitat

Epiphytic in rain-forest; 300–1500 m.

Distribution

U2 Sierra Leone to Cameroun, Central African Republic and Zambia

Orchidaceae, V. S. Summerhayes. Flora of West Tropical Africa 3:1. 1968

Morphology Reproductive morphology Flowers

Flowers orange-yellow to orange-brown.