Pterostylis nutans R.Br.

Nodding greenhood (en)

Species

Angiosperms > Asparagales > Orchidaceae > Pterostylis

Characteristics

Plant c. 5–20–(30) cm. tall. Stem internodes = or much > bracts. Rosette lvs ∞, lamina c. 1.5–3 × 1–2 cm., oblong-ovate, acute to subacute, petiole well-defined, narrowly winged; cauline lvs few, sheathing, bract-like. Fl. us. solitary, remote from highest bract only in tallest plants; top of stem and ovary strongly arched so that fl. faces downwards or even inwards towards stem. Dorsal sepal c. 2.5 cm. tall, rounded, apex acute; lateral sepals very shortly connate, diverging at narrow angle, tips acuminate and hardly overtopping galea, surface minutely rough. Petals ± = dorsal sepal, acute. Labellum narrow-triangular, strongly arched, protruding, apex subacute, its slightly incurved margins ± bristly with short stiff hairs. Column much shorter than labellum; stigma elliptic, rather prominent in N.Z. specimens.
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Rosette leaves 3–6, ovate to oblong, 30–90 x 10–30mm, dark green, margins wavy to crinkled. Flower stem 40–30  tall. Flower strongly nodding, 18–25 x 10–14mm, shiny, translucent pale green with darker green markings, apex often reddish. Dorsal sepal of similar length to petals, shortly pointed, tip often recurved. Lateral sepals scabrous, loosely embracing galea and separated from petals by wide side gap. Sinus bulging in side view, deeply V-notched in front view. Free points projected forwards, tapered, 10–1  long, just extending above hood. Petals shortly pointed. Labellum curved in semicircle, protruding prominently from sinus, 14–18 x 4mm, green and brown, densely bristly, blunt.
A slender orchid. It forms a colony of plants and has tubers. At the base it has a ring of wavy edged leaves. These are oval and 4 cm long by 1.5 cm wide. There are 3-6 leaves. The flower is green and white. They occur singly on flowering stems 30 cm long. The hood is bent over. The tip is curved backwards. The flower is about 2.5 cm across.
Life form perennial
Growth form herb
Growth support free-standing
Foliage retention evergreen
Sexuality hermaphrodite
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Mature height (meter) 0.03
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Nitrogen fixer -
Photosynthetic pathway c3

Environment

Very widely distributed from coast to ranges and tablelands and often locally abundant, growing on flats, slopes and near streams in a wide range of moist sheltered habitats including coastal scrub, heath, heathy forest, grassy forest, wet sclerophyll forest, tall forest, open forest, woodland and among rocks in freely draining to moisture-retentive sands, loams, clays and peat; occasionally in rainforest.
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It is a temperate plant. It grows naturally in coastal ranges. It grows in moist situations. It is mostly in shady sites amongst bracken and shrubs.
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Hardiness (USDA) 7-12

Usage

The tubers are edible but this would kill the plant.
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Edible roots tubers
Therapeutic use -
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Cultivation

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Images

Pterostylis nutans unspecified picture

Distribution

Pterostylis nutans world distribution map, present in Australia and New Zealand

Identifiers

LSID urn:lsid:ipni.org:names:655342-1
WFO ID wfo-0000288533
COL ID 6WLXS
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Pterostylis nutans Pterostylis matthewsii