Caladenia bartlettii

Species

Caladenia bartlettii

Common Name(s)

None Known

Current Threat Status

2012 - At Risk - Naturally Uncommon

Previous Threat Status

2009 - At Risk - Naturally Uncommon
2004 - Sparse

Qualifiers

2012 - Sp
2009 - DP, EF

Authority

Caladenia bartlettii ( Hatch ) D.L.Jones, Molloy et M.A.Clem.

Qualifiers

DP, EF

Family

Orchidaceae

Flora Category

Vascular - Native

Synonyms

Caladenia carnea var. bartlettii Hatch, Petalochilus bartlettii (Hatch) D.L.Jones et M.A.Clem.

Distribution

Endemic. North Island, from Te Paki to about the northern Waikato and Kaimai Ranges (exact southern limits as yet unclear)

Habitat

Coastal to montane (0-500 m a.s.l.). Virtually confined to kauri (Agathis australis (D.Don.) Lindl.) forest where it grows in leaf litter, often near the bases of kauri trees. Also found in gumland scrub (but always in association with kauri remnants). Evidently relishes infertile soils.

Features

Terrestrial orchid usually occurring as solitary plants sometimes as small colonies of up to 10. All parts finely but sparsely eglandular hairy. Leaf solitary up to 200 x 2 mm long, narrow-linear, dark purple-green to reddish-green. Stem erect, slender somewhat wiry, up to 300 mm tall, sparsely eglandular-glandular hairy. Floral bracts 1(-2). Flowers 1(-2) up to 20 mm diameter, in lax racemes, perianth dark glazed mauve to magenta often fading to pink or white near flower centre. Sepals narrowly-elliptic to broadly elliptic, apex obtuse; dorsal sepal erect others spreading to somewhat deflexed. Labellum 3-lobed, marked with transverse dark pink to magenta bands, disc with 2 unequal lines of stalked callii, stalks dark pink to magenta, globular callus heads yellow, lateral lobes deeply cut; mid-lobe broadly triangular, recurved, margins irregular wavy, dark yellow, marginal callii absent. Column erect to slightly recurved, dark pink to magenta, often with 2-3 darker transverse, irregular bars, column wings distinctly broadening toward apex.

Similar Taxa

Caladenia alata is somewhat similar but smaller (up to 120 mm tall) has dull (not glossy) white, pink , red or mauve flowers, perianths with acute rather than obtuse-rounded segment apices, and on either side of the mid-lobe a single orange callus is present. The mid-lobe is also orange-tipped and strongly recurved. C. alata is not confined to kauri forest and is most often found in gumland scrub.

Flowering

October - December

Main Flower Colour

Violet / Purple

Other Flower Colour

Red / Pink

Fruiting

November - February

Propagation Technique

Difficult - should not be removed from the wild

Threats

Caladenia bartlettii is apparently a rather sparsely distributed and naturally uncommon orchid. However, it is quite likely that the apparent rarity of this species is also in part due to its being overlooked for despite its colourful flowers it is not easily seen amongst the leaf litter in which it usually grows. A further issue is that there seems to be much confusion as to the correct application of the name with a number of unnamed segregates allied to C. bartlettii recognised by some New Zealand orchidologists.

Endemic Taxon

Yes

Endemic Genus

No

Endemic Family

No

Where To Buy

Not commericially available

TAXONOMIC NOTES

Jones et al. (2001) revived the genus Petalochilus R.S.Rogers (erected by Rogers (1924) for what has come to be viewed as a peloric state of Caladenia R.Br. - see Moore & Edgar (1970)) for a distinct clade of mostly New Zealand orchids that had usually been referred to as Caladenia. Subsequently Hopper et al. (2004) showed how the reorganisation of Caladenia by Jones et al. (2001) was unworkable and they recommended a return to Caladenia and the other allied Australian genera that had been recognised previously. Following discussion with S. Hopper and P. Weston (pers. comm., 2011, 2014) the treatment of Hopper et al. (2004) is preferred to that of Jones et al. (2001) and so followed here.

.

References and further reading

Hopper, S.D.; Brown, A.P. 2004: Robert Brown's Caladenia revisited, including a revision of its sister genera Cyanicula, Ericksonella and Pheladenia (Caladeniinae: Orchidaceae). Australian Systematic Botany 17: 1-240.

Jones, D.L.; Molloy, B.P.J.; Clements, M.A. 1997: Three new species and a new combination in Caladenia R.Br. (Orchidaceae) from New Zealand. The Orchadian 12: 221-229.

Jones, D.L.; Clements, M.A.; Sharma, I.K.; Mackenzie, A.M. 2001: A New Classification of Caladenia R.Br. (Orchidaceae). The Orchadian 13: 389-419.

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

Rogers, R.S. 1924: Petalochilus: a New Genus of New Zealand Orchids. Journal of Botany 62: 65-67

This page last updated on 3 Nov 2016

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