Senecio radiolatus F.Muell., Senecio lautus var. radiolatus (F.Muell.) Kirk
Vascular – Native
Dicotyledonous Herbs - Composites
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.
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.
2018 | At Risk – Relict
Previous conservation statuses
2012 | At Risk – Naturally Uncommon | Qualifiers: IE, Sp
2009 | At Risk – Relict | Qualifiers: IE, RR, Sp
2004 | Range Restricted
Endemic. Chatham Island group only
Found on dunes and other coastal sites, such as in crevices where there is little soil, or on bouldery beaches. It is typically associated with the nesting sites of sea birds, and has been found on the lagoon-shore limestone cliffs.
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 entire or few-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 10-20, ligules dark yellow, 1.5-8 mm long. Disc yellow, 5-15 mm diameter. Cypsela 2.2-3.5 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 medium-length, retrorse, more or less evenly distributed or occasionally restricted to grooves. Pappus caducous, 5-7 mm long.
Senecio radiolatus subsp. antipodus (Kirk) C.J.Webb is somewhat similar but has less divided leaves, discoid capitula (i.e. lacking ray florets), and smaller (2.0-3.0 cf. 2.5-3.5 mm long), glabrescent seeds with minutely papillate hairs mostly confined to the grooves. Senecio sterquilinus Ornduff has recently been recognised on the ChathamIslands, and is superficially similar to S. radiolatus subsp. radiolatus. For S. radiolatus subsp. radiolatus S. sterquilinus differs by its smaller widely branchign habit, glabrescent stems and leaves which lack lanate hairs. The seeds of S. sterquilinus are very similar to S. radiolatus subsp. radiolatus but not subsp. antipodus.
October - May
November - June
Easy from fresh seed. Short-lived but very attractive and easily grown. Does best in a moist, very fertile (high N, P, K) soil in full sun. Trials in the early 1990s at Percy Reserve and Petone proved tha tit is very attractive plant ideal for an annual border
Threatened by loss of its coastal habitat, loss of seabird colonies and browsing by introduced animals (including insects and molluscs).
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 fresh specimens and 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 Fact Sheet (content continuously updated). New Zealand Plant Conservation Network. https://www.nzpcn.org.nz/flora/species/senecio-radiolatus/ (Date website was queried)