Raukaua simplex
Common name
Haumakoroa
Synonyms
Pseudopanax simplex (G.Forst.) Philipson; Panax simplex G.Forst.; Nothopanax simplex (G.Forst.) Seem; Neopanax simplex (G.Forst) Allan
Family
Araliaceae
Flora category
Vascular – Native
Endemic taxon
Yes
Endemic genus
No
Endemic family
No
Structural class
Dicotyledonous Trees & Shrubs
NVS code
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.
RAUSIM
Chromosome number
2n = 24
Current conservation status
The conservation status of all known New Zealand vascular plant taxa at the rank of species and below were reassessed in 2017 using the New Zealand Threat Classification System (NZTCS). This report includes a statistical summary and brief notes on changes since 2012 and replaces all previous NZTCS lists for vascular plants. Authors: By Peter J. de Lange, Jeremy R. Rolfe, John W. Barkla, Shannel P. Courtney, Paul D. Champion, Leon R. Perrie, Sarah M. Beadel, Kerry A. Ford, Ilse Breitwieser, Ines Schönberger, Rowan Hindmarsh-Walls, Peter B. Heenan and Kate Ladley.
2012 | Not Threatened
Previous conservation statuses
2009 | Not Threatened
2004 | Not Threatened
Brief description
Small tree with different adult (single) and juvenile (trifoliate) toothed leaves on long red stalks and flattened fruit in small clusters
Distribution
Endemic. North, South, Stewart and Aucklands Islands. From Te Moehau (Coromandel) south
Habitat
Lowland to montane forest and also shrubland at tree line. Near seal level to 1400 m a.s.l.
Features
Monoecious. Small much branched tree to 8 m tall; all parts glabrous; bark whiteish grey,branchlets non-fleshy. Leaves alternate; stipules absent. Seedling leaves unifoliate, becoming 3-5-foliate in juvenile stage and then 1-3-foliate in adult. Juvenile leaves sessile or subsessile, 4-15 cm long, narrowly oblong to elliptic, deeply lobed to pinnatifid, lobes acute to obtuse; petioles to 10 cm long. Later juvenile leaves shorter, 5-8 cm long, elliptic to obovate-oblong to lanceolate, acute or obtuse, margins sharply to bluntly serrate, petioles to 6 cm long. Adult leaves usually unifoliate, but trifoliate leaves common, 5-10 x 1.5-4 cm, coriaceous, dark green above, paler below, variously shaped from lanceolate to obovate-oblong, sharply serrate, tip acuminate to acute to obtuse, veins obvious, raised; petiole 3-8 cm long, reddish, non-clasping, terminating in small node in unifoliate leaves. Inflorescence axillary, a compound raceme. Umbellule 5-15 flowered; rays short. Flowers small, green; calyx minutely 5-toothed; ovary 2-loculed, each with 1 ovule; style branches 2, free at tips, stronly curved, connate; stamens 5, projecting,
Similar taxa
Vegetatively similar to some other Pseudopanax species and Raukaua edgerleyi. The unifoliate leaves with a small node at the distal end of the petiole is distinctive, but trioliate specimens can be difficult to distinguish from other species unless flowering or fruiting. The sharply lobed juvenile leaves are distinctive except from Raukaua edgeleyi and Schefflera digitata. R. edgerleyi can be distinguished from R. simplex by its aromatic crushed leaves.
Flowering
(June)-October-March
Flower colours
Green
Fruiting
(June)-October-March
Etymology
raukaua: From the Maori name for R. edgerleyi, raukawa
simplex: Simple, not compound
Where To Buy
Occasionally available from specialist native plant nurseries.
Notes on taxonomy
Recently Frodin & Govaerts (2003) transferred the Chilean species Pseudopanax laetevirens (Miq.) Ball and Tasmanian P. gunnii (Hook.f.) K.Koch to Raukaua. See Frodin, D.G.; Govaerts, R. 2003: World Checklist and Bibliography of Araliaceae, The Cromwell Press, European Union.
Raukaua simplex var. sinclairii (Hook.f.) A.D.Mitchell, D.Frodin et M.Heads is the name given to specimens in the North Island that retain trifoliate leaves as an adult. The distinctiveness of this variety needs further consideration.
Attribution
Description adapted from Mitchell (2005), Mitchell et al (1997), Eagle (2000) and Webb and Simpson (2001).
References and further reading
Moorfield, J. C. (2005). Te aka : Maori-English, English-Maori dictionary and index. Pearson Longman: Auckland, N.Z.
Mitchell, A.D, Frodin, D.G, Heads, M.J. 1997. Reinstatement of Raukaua, a genus of the Araliaceae centred on New Zealand. NZ J. Botany 305: 309-315;
Eagle, A. 2000. Eagle’s complete trees and shrubs of NZ. Te Papa Press, Wellington;
Webb, C.J. & Simpson, M.J.A. 2001. Seeds of NZ gymnosperms and dicotyledons. Manuka Press, Christchurch.