Scientific Name:
Hypericum involutum (Labill.) Choisy, Prodr. monogr. Hyperic. 50 (1821)
  • Ascyrum involutum Labill., Nov. Holl. Pl. 2, 32 (1806)
  • Hypericum pauciflorum subsp. involutum (Labill.) C.Rodr.-Jim., Mem. Soc. Ci. Nat. La Salle 33: 105-106 (1973)
LECTOTYPE (fide Jimenez 1973; Fig.1C): Ascyrum involutum, Herb.Webbianum, No.022722, ex Herb.Labillardiere, FI.
  • = Brathys billardierei Spach, Ann. Sci. Nat., Bot. sér. 2, 5: 367 (1836)

Herbaceous perennial, woody stock, not rhizomatous, up to 0.25 m high. Stems erect, up to 1.3 mm diam., quadrangular, 4-lined, black glands absent, unbranched or branched only from base. Leaves 2.5–20.0 mm long, 0.7–6.8 mm wide, lanceolate, ovate, ovate-elliptic, elliptic oblong or broadly elliptic, glabrous, reticulate tertiary veins absent; pellucid glands conspicuous; black glands absent; apex subacute or obtuse; margin entire and sometimes recurved; base subcordate or ± amplexicaul; sessile. Inflorescence terminal, in lax dichasial cymes, flowers 1–10 per cyme, corolla up to 17.0 mm. Pedicels 4.0–40.0 mm long. Bracteoles absent. Sepals 5, 3.0–7.0 mm long, 1.0–2.5 mm wide, unequal, lanceolate, elliptic, elliptic-oblong or broadly elliptic; pellucid glands abundant, usually linear; black glands absent; apex acute or subacute; margin entire. Petals up to 8.0 mm long and up to 4.5 mm wide, longer than sepals, golden yellow, black glands absent, persistent after anthesis. Stamens not in bundles, 30–43, 3.3–4.5 mm long, shorter than petals; anthers 0.25–0.3 mm long, anther gland absent. Ovary 3.0–3.5 mm long, 1.5–2.5 mm wide, ovoid. Styles 3, 1.0–1.8 mm long, shorter than ovary. Fruit capsule, 5.0–9.5 mm long, 3.2–4.5 mm wide, ovoid, light brown, conspicuously protruding beyond sepals, coriaceous. Seeds 0.6–0.85 mm long, 0.25–0.4 mm wide, oblong, terete, yellow to yellow-brown, longitudinally ribbed, apices obtuse or rounded.


H. involutum is distinguished by an absence of black glands, erect, quadrangular and 4-lined stems that branch from a woody base, 3 styles, and the infloresecence is terminal with solitary flowers or with few-flowered dichasial cymes.


North Island: Northland, Auckland, Southern North Island.

South Island: Western Nelson, Sounds Nelson, Marlborough, Canterbury, Otago, Southland.

Also Australia.


Occurs in lowland to montane, dry and open habitats such as on and around rock outcrops, under open manuka and kanuka stands, and in sparsely vegetated tussock-grassland.

Indigenous (Non-endemic)

Also indigenous to Australia.


A putative hybrid between H. involutum and H. pusillum has been collected from Takahue, Northland (CHR 295786).


Flowering: Oct.–Mar.


n=8, 2n = 16 (Hair & Beuzenberg 1959, as H. gramineum; de Lange et al. 2004, as H. gramineum).


Australian plants of H. involutum differ from New Zealand plants in having a slightly smaller capsule (5.0–6.5 mm long compared with 5.0–9.5 mm long) and fewer stamens (9–27 compared with 30–43). Further study of additional Australian and New Zealand specimens is required to determine the significance of this variation.

Choisy 1821: Prodromus d'une monographie de la famille des hypericinees.
de Lange, P.J.; Murray, B.G.; Datson, P.M. 2004: Contributions to a chromosome atlas of the New Zealand flora – 38. Counts for 50 families. New Zealand Journal of Botany 42: 873–904.
de Lange, P.J.; Rolfe, J.R.; Barkla J.W.; Courtney, S.P.; Champion, P.D.; Perrie, L.R.; Beadel, S.N.; Ford, K.A.; Breitwieser, I.; Schönberger, I.; Hindmarsh-Walls, R.; Heenan, P.B.; Ladley, K. 2018: Conservation status of New Zealand indigenous vascular plants, 2017. New Zealand Threat Classification Series. No. 22. [Declining]
de Lange, P.J.; Rolfe, J.R.; Champion, P.D.; Courtney, S.P.; Heenan, P.B.; Barkla, J.W.; Cameron, E.K.; Norton, D.A.; Hitchmough, R.A. 2013: Conservation status of New Zealand indigenous vascular plants, 2012. New Zealand Threat Classification Series 3. Department of Conservation, Wellington. [Declining]
Hair, J.B.; Beuzenberg, E. J. 1959: Contributions to a chromosome atlas of the New Zealand flora — 2. Miscellaneous families. New Zealand Journal of Science 2: 148–156.
Heenan, P.B. 2011: Taxonomic notes on the New Zealand flora: Hypericum gramineum and Hypericum involutum (Hypericaceae). New Zealand Journal of Botany 49(1): 133–139.
Heenan, P.B. 2014: Hypericaceae. In: Breitwieser, I.; Brownsey, P.J.; Heenan, P.B.; Wilton, A.D. (ed.) Flora of New Zealand — Seed Plants. Fascicle 1. Manaaki Whenua Press, Lincoln.
Labillardière, J.J.H. de 1806–1807: Novae Hollandiae Plantarum Specimen. Vol. 2. Huzard, Paris.
Robson, N.K.B. 1990: Studies in the genus Hypericum L. (Guttiferae) 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys. Bulletin of the British Museum (Natural History). Botany 20: 1–151.
Rodríguez Jiménez, C. 1973: Recherches sur HypericumL. section Brathys (Mutis ex L.f.) Choisy, sous-section Spachium Keller (Guttiferae). Memoria de la Sociedad de Ciencias Naturales La Salle 33: 1–151.
Spach, É. 1836: Conspectus monographie fragmenta. Annales des Sciences Naturelles; Botanique sér. 2, 5: 349–369.