Leptinella pyrethrifolia var. linearifolia
Red Hills button daisy
Cotula linearifolia Cheeseman, Cotula pyrethrifolia var. linearifolia (Cheeseman) D.G.Lloyd
Vascular – Native
Herbs - Dicotyledonous composites
2n = 156
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: OL
Previous conservation statuses
2009 | At Risk – Naturally Uncommon | Qualifiers: OL
2004 | Range Restricted
Endemic. South Island, Marlborough. An ultramafic endemic of the Red Hills.
An ultramafic endemic found on water logged or free draining soils, rubble, talus or within open sites within the predominantly Chionochloa defracta Connor dominated tussock grasslands of that region.
Gynodioecious creeping perennial herb forming circular patches up to 1 m wide. Rhizomes on soil surface or intertangled and lying on older, decaying rhizomes, stout, somewhat fleshy 1-3 mm diameter, dark green to purple-red, sparsely pilose hairy, becoming woody and glabrous with age; branches usually clustered with up to 6 radiating from around a flowering node; leaves clustered at apex, sometimes with older leaves up to 30 mm apart. Roots extensive, stout, up to 200 x 1 mm. Leaves 5-25 x 1-3 mm; blade 4-10 mm long, linear, entire, rarely with one lobe up to 2 mm long near apex on one or both sides, coriaceous, fleshy, dark red-green, glabrous midrib not raised on ventral surface. Peduncles longer than leaves, 20-120 mm, dark red green, with 1-8 evenly spaced, small linear bracts, rarely ebracteate, sparsely pilose. Capitula fragrant, pistillate, staminate or bisexual (on different plants). Pistillate capitula 5-15 mm diameter, surface flat or slightly convex; involucre hemisperhical; involucral bracts 20-110, subequally 2- or more seriate, fleshy, oblong, dark green, with a single dark vein evident, glabrous, with wide brown scarious margins; florets 50-200, 2.75-4 mm long, straight, white, cream or lemon-yellow; corolla 2-4 times as long as wide, dentition equal. Staminate capitula 5-18 mm diameter, surface convex; involucre spreading or flat; involucral bracts 10-60; florets 40-300, occasionally with a dark stripe down the broader part of the corolla. Bisexual capitula intermediate, numbers of pistillate and pistillate florest varying from plant to plant. Cypsela 2.3 x 1 mm, dark brown, compressed, biconvex, slightly wrinkled.
L. pyrethrifolia var. linearifolia (Cheeseman) D.G.Lloyd et C.J.Webb is easily distinguished from var. pyrethrifolia, it has linear red-green leaves (rarely with an apical lobing), rather than dark green 1-pinnatifid leaves, dark brown rather than golden-brown seeds, and is confined to ultramafic substrates in the Red Hills, upper Wairau Valley.
September - January
October - May
Papery cypselae are dispersed by wind and possibly attachment (Thorsen et al., 2009).
Easily grown from rooted pieces and odes well in most garden situations. It prefers a sunny situation and is tolerant of wet or dry conditions. Although it will grow without it, this plant benefits from regular applications of a magnesium rich fertiliser.
Not threatened but listed because it is a narrow range endemic of restricted distribution
leptinella: From the Greek word leptos (meaning slender, thin or delicate), referring to the ovary
linearifolia: With linear leaves
Fact sheet prepared for NZPCN by P.J. de Lange 31 August 2006. Description from Lloyd (1972) - as Cotula pyrethrifolia var. linearifolia
References and further reading
Lloyd, D.G. 1972: A revision of the New Zealand, Subantarctic, and South American species of Cotula, section Leptinella. New Zealand Journal of Botany 10: 277-372.
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
Please cite as: de Lange, P.J. (Year at time of access): Leptinella pyrethrifolia var. linearifolia Fact Sheet (content continuously updated). New Zealand Plant Conservation Network. https://www.nzpcn.org.nz/flora/species/leptinella-pyrethrifolia-var-linearifolia/ (Date website was queried)