Species

Libertia ixioides

Etymology

Libertia: Named after Madame Libert, a Dutch botanist
ixioides: like an ixia

Common Name(s)

Mikoikoi, NZ iris

Current Conservation Status

2012 - Not Threatened

Conservation status of New Zealand indigenous vascular plants, 2012
The conservation status of all known New Zealand vascular plant taxa at the rank of species and below were reassessed in 2012 using the New Zealand Threat Classification System (NZTCS). This report includes a statistical summary and brief notes on changes since 2009 and replaces all previous NZTCS lists for vascular plants. Authors: Peter J. de Lange, Jeremy R. Rolfe, Paul D. Champion, Shannel P. Courtney, Peter B. Heenan, John W. Barkla, Ewen K. Cameron, David A. Norton and Rodney A. Hitchmough. File size: 792KB

Previous Conservation Status

2009 - Not Threatened
2004 - Not Threatened

Authority

Libertia ixioides (Forst.f.) Spreng.

Family

Iridaceae

Flora Category

Vascular - Native

NVS Species Code

LIBIXI

The National Vegetation Survey (NVS) Databank is a physical archive and electronic databank containing records of over 94,000 vegetation survey plots - including data from over 19,000 permanent plots. NVS maintains a standard set of species code abbreviations that correspond to standard scientific plant names from the Ngä Tipu o Aotearoa - New Zealand Plants database.

Structural Class

Monocotyledonous Herbs

Synonyms

Sisyrinchium ixioides Forst.f., Libertia tricolor Lem.; Moraea ixioides (G.Forst.) Thunb.; Ferraria ixioides (G.Forst.) Willd.; Nematostigma ixioides (G.Forst.) A.Dietr.; Renealmia ixioides (G.Forst.) Ker Gawl.; Tekelia ixioides (G.Forst.) Kuntze

Distribution

Endemic. New Zealand: North, South and Stewart Islands.

Habitat

Coastal to montane. Often locally common on ridges, cliffs, gullies, river banks, coastal cliffs, and upland forest. It has been recorded as epiphytic in some northern sites.

Features

Plants consisting of leafy fans, close together on short, much branched rhizomes, joined by short stolons. Leaves 150–1160 × 3–12 mm, the two surfaces similar; inclined to turn yellow where exposed to full sun; leaf bases pale red-green; nerves many, median ones crowded to form pale midrib; margins often finely scabrid, leaf in transverse section convex lens-shaped, two rows of vascular bundles present, marginal vascular bundle present, sclerenchyma present on inside of leaf sheath. Peduncles long (2/3 length of the inflorescence), but inflorescence short, usually not carrying flowers or fruits above leaves. Panicle narrow, but much branched, or sometimes simply branched; lower bracts long (50–410 mm), green, lanceolate, upper bracts narrow and pale brown, occurring singly; 1–6 flowers (often 2) per branch. Pedicels stout, 10–28 mm long, glabrous. Flower bud sometimes yellowish, usually much smaller than ovary, flowers 8–25 mm diameter; tepals all white internally, widely patent; outer tepals about ½ length of inner tepals and narrower, elliptical, flattened, with apiculus; inner tepals orbicular-elliptical, shortly unguiculate, not usually covering outer tepals, slight cleft at tips. Staminal filaments very shortly connate; anthers c.2 mm long, yellow. Ovary pale, larger than perianth bud; style branches sometimes slightly winged, usually pointing outwards. Capsule 7–25 mm long, 5–14 mm diameter, barrel-shaped, ripening from green to yellow to black, partially dehiscing by short loculicidal splitting; old valves pale and not widely patent. Seeds 1.0–2.0 × 1.0–1.5 mm, rounded or occasionally angular, reticulate-foveolate, bright tangerine orange.

Similar Taxa

The large ovaries (when compared with perianth bud size at anthesis) and large partially dehiscing capsules which dry to a pale tan colour (rather than black) separates this species from all other New Zealand Libertia. Libertia ixioides differs from L. grandiflora and L. mooreae by its shorter inflorescences, large sepals, and oblong petals, and yellow leaf colour in summer. It differs from L. peregrinans through the lack of raised coloured mid-veins on the leaves, and from L. peregrinans, L. edgariae, L. cranwelliae, and L. ixioides × L. peregrinans by the short rather than long rhizomes. It differs from L. micrantha by its taller stature, rhizome type, and larger flowers

Flowering

September – December

Flower Colours

White,Yellow

Fruiting

January - December

Propagation Technique

Easily grown from fresh seed and by the division of established plants. Very forgiving and tolerant of a wide range of situations. Next to Libertia peregrinans, L. ixioides is the most widely cultivated of the New Zealand Libertia. Forms with highly coloured foliage are now especially popular.

Threats

Not Threatened

Chromosome No.

2n = 228

Endemic Taxon

Yes

Endemic Genus

No

Endemic Family

No

Life Cycle and Dispersal

Seeds are possibly dispersed by wind (Thorsen et al., 2009).

 

     

Attribution

Description modified from Blanchon et al. (2002)

References and further reading

Blanchon, D.J.; Murray, B.G.; Braggins, J.E. 2002: A taxonomic revision of Libertia (Iridaceae) in New Zealand. New Zealand Journal of Botany 40: 437–456.

Thorsen, M. J.; Dickinson, K. J. M.; Seddon, P. J. 2009. Seed dispersal systems in the New Zealand flora. Perspectives in Plant Ecology, Evolution and Systematics 11: 285-309

This page last updated on 7 Jun 2015