, commonly known as Russell's greenhood
, is a species of orchid endemic
to eastern Australia
. Non-flowering plants have a rosette
of leaves flat on the ground but flowering plants have a single shiny white and dark green flower on a flowering stem lacking a rosette but with a few spreading stem leaves.
is a terrestrial, perennial
with an underground tuber
and when not flowering, a rosette of between three and six dark green, oblong to heart-shaped leaves, each leaf 15-40 mm long and 10-18 mm wide. Flowering plants have a single shiny dark green and white flower 15-20 mm long and 7-9 mm wide on a stem 200-350 mm tall with three to five stem leaves. The dorsal
sepal and petal
s are fused, forming a hood or "galea" over the column
curving forward in a semi-circle. The dorsal sepal ends with a thread-like tip 3-7 mm long. The lateral
sepals are held closely against the galea, have erect thread-like tips 20-30 mm long and a protruding, V-shaped sinus
between their bases. The labellum is about 11-14 mm long and about 3 mm wide, blackish, blunt and protruding above the sinus. Flowering occurs from April to August.
Taxonomy and naming
was first formally described in 1952 by Trevor Hunt
from a specimen collected near Brisbane
and the description was published in The Orchid Journal (California)
. The specific epithet
) honours "Mr. A.J. Russell, then Captain Russell, a keen and competent student of Australian orchids" who first collected this species.
Distribution and habitat
Russell's greenhood grows in moist, shady places in forest between Grafton
in New South Wales