Senecio radiolatus subsp. antipodus
Senecio antipodus Kirk
Vascular – Native
Dicotyledonous Herbs - Composites
2n = 40
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 | At Risk – Naturally Uncommon | Qualifiers: CD, IE
Previous conservation statuses
2009 | At Risk – Naturally Uncommon | Qualifiers: OL, EF, IE
2004 | Range Restricted
Endemic. Antipodes Islands only
Coastal to upland (0 - 330 m a.s.l.) where it nearly always found in the vicinity of seal haul outs and sea bird nesting grounds/colonies. Another indigenous plant whose ecology seems tied to guano enriched systems.
Annual to short-lived, stout, grey-green to dark green, fleshy, erect perennial herb. Leaves mostly lanate when young, maturing glabrate or glabrous above, but remaining lanate beneath, base amplexicaul, cuneate; lamina 30-250 x 20-120 mm, dark grey-green, silvery-grey or dark green above, paler beneath, ovate to suborbicular, pinnately lobed to pinnatisect with many narrow to broad, lanceolate entire or deeply jagged-toothed segments. Uppermost leaves smaller, less divided, narrow-obovate, broadly tapering to base. Supplementary bracts and calycular bracteoles variable, 3-16, 1.5-8 mm long. Involucral bracts 13-20, 4-9 mm long, glabrate. Ray florets absent. Disc yellow, 5-15 mm diameter. Cypsela 2.0-3.0 mm long, dark brown to black-brown, narrowly elliptic to narrowly oblong-elliptic, narrowed to and often slightly constricted below apex, base cuneate; ribs broad, rounded with narrow u-shaped grooves, hairs very-short, papillate, mostly restricted to grooves with a very sparse covering sometimes present elsewhere. Pappus caducous, 5-7 mm long.
Allied to S. radiolatus F.Muell. subsp. radiolatus from which it only differs by its eradiate (discoid) capitula (i.e. it lacks ray florets), and slightly smaller, less obviously hairy seeds. Both subspecies seem closely allied to S. sterquilinus Ornduff from which they differ by their more erect growth habit, smaller flowers, and consistently lanate-hairy leaves.
November - January
December - March
Easy from fresh seed but intolerant of humidity and warm climates. Short-lived and rather difficult to maintain except in cooler climates.
A narrow range endemic of restricted distribution. However common within its island habitat
senecio: From the Latin senex ‘old man’ (probably referring to the bearded seeds)
Where To Buy
Not commercially available
Fact Sheet prepared for NZPCN by P.J. de Lange 11 November 2008. Description based on Webb et al. (1988) supplemented with information obtained from herbarium material.
References and further reading
Webb CJ, Sykes WR, Garnock-Jones PJ 1988. Flora of New Zealand. Vol. IV. Botany Division, DSIR, Christchurch.
Please cite as: de Lange, P.J. (Year at time of access): Senecio radiolatus subsp. antipodus Fact Sheet (content continuously updated). New Zealand Plant Conservation Network. https://www.nzpcn.org.nz/flora/species/senecio-radiolatus-subsp-antipodus/ (Date website was queried)