Senecio repangae subsp. repangae
Vascular – Native
Dicotyledonous Herbs - Composites
2n = 100
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 | Threatened – Nationally Vulnerable
Previous conservation statuses
2012 | At Risk – Naturally Uncommon | Qualifiers: IE, Sp
2009 | At Risk – Naturally Uncommon | Qualifiers: EF
2004 | Sparse
Endemic. North Eastern North Island, on offshore islands only, from Te Wakatehaua to Cuvier (Repanga) Island
Strictly coastal. A species of mainly offshore islands where it grows in the immediate vicinity of seabird colonies (gulls, shags, petrels, diving petrels). Also an opportunist on islands colonising sites where trees have fallen, pasture, and even behaving as a minor weed within lighthouse settlements.
Erect, sparingly branched annual to short-lived perennial herb 0.2-1.2 m tall, arising from a stout woody rootstock. Foliage dull dark grey-green. Leaves pilose hairy; basal leaves cuneately narrowed or shortly petiolate, broadly elliptic-oval or rhomboidal, coarsely toothed, rarely lyrate-pinnatifid. Mid cauline leaves amplexicaul, usually deeply bifid at base, narrow, ovate, elliptic, lanceolate or oblong, pinnately lobed 1-2-pinnatifid with segments lanceolate to oblong, entire or few-toothed, gradually diminishing in size up stem, becoming apetiolate. Uppermost leaves smaller, lanceolate, dentate or pinnatifid. Supplementary bracts 5-9, narrow, 2-5 mm long; lower most usually dentate; margins often slightly villous, apex villous. Capitulum subcylindric; involucral bracts 9-17, narrowly lanceolate, 8-14 mm long, glabrescent, with purple-black villous apices. Ray florets (0-)3-9, widely and irregularly spaced; ligules 1-2 mm, sulphur yellow; margin involute; apex recurved, incised 3-4 times. Disc yellow 4-5 mm diameter. Cypsela subcylindric, 2.5-3 mm long, grey, slightly narrowed at apex, covered in hairs, but hairs distinctly denser toward apices and between ribs.
Senecio repangae subsp. pokohinuensis de Lange et B.G.Murray is similar and differs mainly by its glabrescent, glaucous foliage, short capitula bracts, and ray florets which are not recurved, and are evenly spaced. Senecio repangae had previously been included with S. lautus, from which it differs in its sparingly branched, erect growth form, non-succulent foliage, greater number of involucral bracts (9-20 cf 11-13), longer racts (6-14 mm cf 4-7 mm), shorter ligules (1-4 mm cf 5-9 mm) and grey, subcylindric rather than black, narrowly cylindric cypsela. Senecio repangae has 2n = 100 chromosomes and S. lautus 2n = 40.
September - March
September - April
Easy from fresh seed. Prefers full sun. Can become invasive. Despite its weedy nature it makes an excellent pot plant
Aside from Cuvier (Repanga) Island where it is abundant this subspecies is very uncommon and is known only from small, widely scattered populations.
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 1 November 2008. Description based on de Lange & Murray (1998).
References and further reading
de Lange, P.J.; Murray, B. G. 1998: Senecio repangae (Asteraceae): a new endemic species from the north-eastern North Island, New Zealand. New Zealand Journal of Botany 36(4): 509-519.
Please cite as: de Lange, P.J. (Year at time of access): Senecio repangae subsp. repangae Fact Sheet (content continuously updated). New Zealand Plant Conservation Network. https://www.nzpcn.org.nz/flora/species/senecio-repangae-subsp-repangae/ (Date website was queried)