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Simpson's description is: "Similar to the species, but everywhere stouter. Stems 3 mm. diam. Leaves green, fleshy, 3 cm. long, 1 cm. broad, with a long sheathing base. Petiole equalling the blade, flattened 2 mm. broad; sheath membranous, 5 mm. broad. Blade ovate or broadly ovate in outline, closely pinnate or deeply pinnatifid, with 1–4 (3) pairs of obovate obtuse pinnae and a terminal one, occasional pinnae irregularly 1–3 lobed. Peduncles 5–7 cm. long, with 4–10 narrow-linear bracts with scarious tips. Heads 1·5 cm. diam."
[From: Allan (1961) Flora of New Zealand. Volume 1 as Cotula pyrethrifolia var. robusta G.Simpson]