Prasophyllum hectorii

  • Near Waiouru. Feb 2007.
  • Near Waiouru. Feb 2007.
  • Habit of Prasophyllum hectorii
  • Habit of Prasophyllum hectorii
  • Prasophyllum hectorii raceme showing minimal spacing between flowers (unusual condition)
  • A close up of an Prasophyllum hectorii raceme
  • Prasophyllum hectorii flowers
  • Close up of Prasophyllum hectorii flower showing labellum and callus
  • Prasophyllum hectorii at Plateau Bog
  • Prasophyllum hectorii at Plateau Bog
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Species

Prasophyllum hectorii

Etymology

Prasophyllum: From the Greek 'prasos' leek and phyllos 'leaf'
hectorii: Named after Sir James Hector, 19th century New Zealand geologist and botanist who was originally from Scotland

Common Name(s)

swamp leek orchid

Current Threat Status

2012 - At Risk - Declining

Previous Threat Status

2009 - At Risk - Relict
2004 - Threatened - Nationally Vulnerable

Qualifiers

2012 - PD
2009 - CD, EF

Authority

Prasophyllum hectorii (Buchanan) Molloy, D.L.Jones et M.A.Clem.

Qualifiers

CD, EF

Family

Orchidaceae

Flora Category

Vascular - Native

Synonyms

Gastrodia hectorii Buchanan

Distribution

Endemic. North and Chatham Islands. Formerly known in the North Island from Te Paki south to near Waiouru, and from one site on the main Chatham Island. Current records exist for Te Paki, the Waikato and Central Volcanic Plateau.

Habitat

Coastal to subalpine, in wetlands (0-1100m a.s.l.), and associated slow flowing streams. Usually found partially submerged in or at the margins of pools and streams, where the plants tubers may be seen floating just above the sediment. It is often associated with the sedge genera Baumea and Eleocharis (Cyperaceae) where it easily overlooked unless flowering.

Features

Stout orchid of wetlands. Plants sweetly scented, 0.15-1 m tall at flowering, Tuber ovoid usually paired with previous seasons tuber, roots few, stout, peg-like. Stem erect, fleshy, terete, dark green. Leaf solitary, usually overtopping raceme; lamina yellow-green to dark green, fleshy, terete, apex acute. Inflorescence a few to many flowered raceme. Flowers more or less evenly spaced, 10-80-flowered, fleshy-succulent. Perianth yellow, yellow-green to green. Dorsal sepal 6-8 mm, broad-ovate, concave; laterals somewhat longer, narrow-oblong, free to base, margins thin, apex often hooded, sometimes appearing bidentate. Petals slightly shorter, thinner. Labellum yellow, white or black, prominent, narrowed at base to a short, stout claw, ovate, sharply bent at a right angle halfway from base; margin undulate; callus confined to proximal tip. Lateral processes of column oblong, falcate, as tall as rostellum. Anther sessile, overtopped by rostellum. Stigma prominent.

Similar Taxa

A distinctive species with a very specific habitat requirement, such that it rarely grows with other orchid species. It could be confused with some forms of Prasophyllum colensoi Hook.f. that sometimes grow in wetlands but these are usually much shorter plants, with fewer reddish coloured flowers. The callus of the labellum in P. colensoi extends the whole length, almost to the apex, whereas that of P. hectorii is confined to the proximal part.

Flowering

(November -) December - February

Main Flower Colour

Yellow

Other Flower Colour

Green

Fruiting

November - May

Propagation Technique

Difficult. Should not be removed from the wild

Threats

This species has declined from most of its former coastal and lowland wetland haunts as a consequence of drainage, competition from weeds and on occasion excessive collection by botanists and plant collectors. Drainage is still the main threat to the majority of its remaining populations, several large ones of which are entirely on private land. Invasive weeds, particularly royal fern (Osmunda regalis) are a problem in the Waikato. Previously recorded as Prasophyllum aff. patens (AK 236408; New Zealand) by de Lange et al. (2004).

Chromosome No.

2n = 42

Endemic Taxon

Yes

Endemic Genus

No

Endemic Family

No

Where To Buy

Not commercially available

TAXONOMIC NOTES

Until recently Prasophyllum hectorii has been known in New Zealand as P. patens R.Br. which is an Australian endemic. New Zealand plants have also been referred to P. suttonii Rogers et B.Rees, another Australian endemic.

Recent molecular and morphological studies, as yet unpublished suggest that the two New Zealand Prasophyllum will need placing in another, as yet undescribed new genus (Peter Weston pers. comm. November 2014)

References and further reading

de Lange, P.J.; Norton, D.A.; Heenan, P.B.; Courtney, S.P.; Molloy, B.P.J.; Ogle, C.C.; Rance, B.D.; Johnson, P.N.; Hitchmough, R. 2004: Threatened and uncommon plants of New Zealand. New Zealand Journal of Botany 42: 45-76.

Moore, L.B.; Edgar, E. 1970: Flora of New Zealand. Vol. II. Government Printer, Wellington

This page last updated on 9 Dec 2014

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