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Classification
Class
Family
Genus
Nomenclature
Scientific Name:
Hibiscus richardsonii Sweet ex Lindl., Bot. Reg. 11, t. 875 (1825) – as Richardsoni
Synonymy:
LECTOTYPE: Australia: New South Wales: observed flower[ing] February, abundant on the banks of the Nepean [River], 1817, C. Fraser s.n. (BM).
- = Hibiscus trionoides G.Don, Gen. Hist. 1, 483 (1831)
Description
Herb 0.2–1.0 m tall. Branchlet with fine stellate hairs 0.2–0.8 mm long and coarser stellate hairs 0.4–0.7 mm long, with sparse coarse bristles 0.3–0.6 mm long, and with sparse fine bristles 0.2–0.5 mm long. Stipules more or less persistent, 4–5 mm long. Mid-stem and distal leaves 3-lobed (rarely unlobed, or 5- or 7-lobed), lobing not extended to the apex of the petiole, the primary lobes themselves scarcely lobed, palmately veined; lamina of mid-stem leaves 20–65 mm long, 15–45 mm wide, in overall shape ovate, or broadly ovate, with fine and coarse stellate hairs, margin strongly serrate, lobe apex acute or obtuse; petiole 10–30 mm long with indumentum similar to that of the branchlet; foliar nectary absent. Flowers solitary in leaf axils, chasmogamous, pedunculate; peduncle 10–20 mm long, with fine and coarse stellate hairs, rarely also with fine bristles; pedicel 4–10 mm long, indumentum dissimilar to that of peduncle (stellate hairs longer and denser, coarse bristles present). Epicalyx 12–14-segmented, 10–13.5 mm long, segments linear, free at the base, shorter than the calyx to equally as long as the calyx. Calyx at anthesis 13–15 mm long, distinctly accrescent in fruit, with stellate hairs, fine and coarse bristles and sparse glandular hairs, without prominent marginal ribs; lobes triangular, acute at the apex; calyx nectary absent. Petal 19–26 mm long, yellow distally faintly flushed pink, base sometimes with fine pale red striations. Staminal column 7–10 mm long with the stamens distributed along the distal 4–7 mm of the column; staminal filaments 1–2.3 mm long; anthers yellow; pollen yellow. Style (including style branches) exserted 2.3–3.8 mm beyond the apex of the staminal column; style branches 5, 2.3–3 mm long; stigmas capitate, 0.8–1.2 mm across, stigmatic hairs 0.1–0.2 mm long. Ovary hairy. Fruit, capsulate. Capsule hairy, 10–12 mm long. Seed 2–2.2 mm long, subreniform, papillate-pubescent and smooth between the hair pustules.
[Reproduced from Craven et al. (2011, New Zealand J. Bot. 49: 27–40) with permission from The Royal Society of New Zealand.]
Biostatus
Indigenous (Non-endemic)
Bibliography
Craven, L.A.; de Lange, P.J.; Lally,T.R.; Murray, B.G.; Johnson, S.B 2011: A taxonomic re-evaluation of Hibiscus trionum (Malvaceae) in Australasia. New Zealand Journal of Botany 49(1): 27–40.
de Lange, P.J. 2008: Hibiscus richardsonii - rediscovery of a native hibiscus in New Zealand. New Zealand Botanical Society Newsletter 93: 13–15.
de Lange, P.J.; Heenan, P.B.; Given, D.R.; Norton, D.A.; Ogle, C.C.; Johnson, P.N.; Cameron, E.K. 1999: Threatened and uncommon plants of New Zealand. New Zealand Journal of Botany 37: 603–628.
de Lange, P.J.; Norton, D.A.; Courtney, S.P.; Heenan, P.B.; Barkla, J.W.; Cameron, E.K.; Hitchmough, R.; Townsend, A.J. 2009: Threatened and uncommon plants of New Zealand (2008 revision). New Zealand Journal of Botany 47: 61–96. [Nationally Critical]
de Lange, P.J.; Norton, D.A.; Heenan, P.B.; Courtney, S.P.; Molloy, B.P.J.; Ogle, C.C.; Rance, B.D. 2004: Threatened and uncommon plants of New Zealand. New Zealand Journal of Botany 42(1): 45–76. [as Hibiscus aff. trionum (AK 218967; North Island)]
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. [Nationally Critical]
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. [Nationally Critical]
Don, G. 1831: A General History of the Dichlamydeous Plants. Vol. 1. Rivington, London.
Ker Gawler, J.B. 1825–1826: Botanical Register; consisting of coloured figures of exotic plants cultivated in British gardens; with their history and mode of treatment. Vol. 11. Ridgway, London.
Murray, B.G.; Craven, L.A.; de lange, P.J. 2008: New observations on chromosome number variation in Hibiscus trionum s.l. (Malvaceae) and their implications for systematics and conservation. New Zealand Journal of Botany 46: 315–319.
