Dendrobium aemulum

Dendrobium aemulum, commonly known as ironbark feather orchid^[3] or white feather orchid,^[4] is an epiphytic orchid in the family Orchidaceae and grows on trees that retain their bark, especially ironbarks. It has reddish or purplish pseudobulbs, two to four leathery leaves and up to seven white, feathery flowers. It grows in open forest in Queensland and New South Wales.

Ironbark feather orchid
Dendrobium aemulum in Lamington National Park
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Monocots
Order:	Asparagales
Family:	Orchidaceae
Subfamily:	Epidendroideae
Genus:	Dendrobium
Species:	D. aemulum
Binomial name
Dendrobium aemulum R.Br.[1]
Synonyms[2]
List Callista aemula (R.Br.) Kuntze Dendrocoryne aemulum (R.Br.) Brieger Tropilis aemula (R.Br.) Raf. Dendrobium angustum (D.L.Jones & M.A.Clem.) J.M.H.Shaw Dendrobium crassum (D.L.Jones, B.Gray & M.A.Clem.) J.M.H.Shaw Dendrobium deuteroeburneum J.M.H.Shaw Dendrobium eungellensis (D.L.Jones & M.A.Clem.) J.M.H.Shaw Dendrobium odontochilum Rchb.f. Dendrobium radiatum (D.L.Jones & M.A.Clem.) J.M.H.Shaw Tropilis angusta D.L.Jones & M.A.Clem. Tropilis crassa D.L.Jones, B.Gray & M.A.Clem. Tropilis eburnea D.L.Jones & M.A.Clem. Tropilis eungellensis D.L.Jones & M.A.Clem. Tropilis odontochila (Rchb.f.) Butzin Tropilis radiata D.L.Jones & M.A.Clem.

Description

Dendrobium aemulum is an epiphytic herb that has hard, straight, projecting, reddish or purplish brown pseudobulbs 50–180 mm (2–7 in) long and 7–12 mm (0.3–0.5 in) wide. There are between two and four dark green, leathery leaves 20–50 mm (0.8–2 in) long, 20–30 mm (0.8–1 in) wide and folded along the midline. The flowering stems are 20–100 mm (0.8–4 in) long and bear between two and twelve resupinate white to pale yellow flowers 17–20 mm (0.67–0.79 in) long and 20–25 mm (0.79–0.98 in) wide. The dorsal sepal is 18–25 mm (0.7–1 in) long and 3 mm (0.1 in) wide. The lateral sepals curve downwards and are 16–22 mm (0.6–0.9 in) long and about 3 mm (0.1 in) wide. The petals are a similar length to the dorsal sepal but only about 1 mm (0.04 in) wide. The sepals and petals all spread widely, drooping and often turning pink as they age. The labellum is also white to pale yellow, 6–7 mm (0.2–0.3 in) long, 5–6 mm (0.20–0.24 in) wide and has purplish markings and three lobes. The side lobes are pointed and curve upwards and the middle lobe curves downwards. Flowering occurs from August to October. The flowers are reputed to produce a sweet scent at night, "suggesting pollination by night-flying insects".^[3][4][5]

Taxonomy and naming

Dendrobium aemulum was first formally described in 1810 by Robert Brown and the description was published in the Prodromus Florae Novae Hollandiae et Insulae Van Diemen.^[6][7] The specific epithet (aemula) is Latin word meaning "emulating" or "rivalling".^[8]

Distribution and habitat

The ironbark feather orchid grows on trees that do not lose their bark, including ironbarks, brush box (Lophostemon confertus) and cypress pine (Callitris species). It is found between the Calliope Range near Gladstone in Queensland and Moruya in New South Wales growing in open forest from the coast to nearby tablelands.^{[3][5][9][10]}