Oreomyrrhis basicola Heenan et Molloy
Vascular – Native
Dicotyledonous Herbs other than Composites
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 | Threatened – Nationally Critical | Qualifiers: CD, RR, St
Previous conservation statuses
2009 | Threatened – Nationally Critical | Qualifiers: CD, RR, St
2004 | Threatened – Nationally Endangered
Endemic. South Island where it is known from three sites: northern Otago, at Awahokomo (upper Waitaki Valley), and from Southland at West Dome (southern Eyre Range) and Bald Hill in the Livingstone mountains.
Known only from limestone and ultramafic rock outcrops. On limestone it is a species of sparsely vegetated habitats, including limestone pavement, fissures, talus slopes and eroding exposures of rendzina soil. Within ultramafic habitats it occupies similar situations, such as on gravel pavements and screes.
Short-lived perennial herb arising from slender tap root. Leaves radical, spreading, up to 110 mm long, grey-green to blue-grey; 1(-2) pinnate with 5-8 pairs of primary pinnae. Upper leaf surface glabrous, undersides glabrous to moderately hairy, pinnae linear, entire 2-15 x 0.6-1.6 mm, decreasing in size toward distal end. Peduncles 1-10, slender, 0.7-2.0 mm diam., decumbent, spreading or ascending, sometimes branched, up to 10 mm long, covered in sparse retrorse hairs. Involucre of 4-7 linear bracts; bracts 1.8-2.8 x 0.6-1.5 mm, green, entire, margins ciliate. Pedicels initially 0.4-0.9 mm long, up to 22 mm long in fruit; flowers 7-17, 2.0-3.2 mm diam. Calyx teeth obsolete. Petals 4-5, 0.6-1.2 x 0.7-0.9 mm, ovate, obovate to broadly elliptic, cream. Ovary 2.2-2.3 mm long, concial, styles 0.2-0.3 mm long slender. Filaments 0.3-0.4 mm, white; anthers 0.2-0.3 mm long, faintly rose tinted. Mericarps 4.2-4.9 x 1.2-1.6 mm, oblong, glabrous, matt, olive green. Ribs 5, prominent.
Oreomyrrhis basicola is part of the O. rigida (Kirk) Allan complex from which it is best distinguished by the grey-green to blue-green leaves with fewer primary pinnae, which are only occasionally divided into secondary pinnae.
November - January
Hairy mericarps are dispersed by wind and possibly attachment (Thorsen et al., 2009).
Difficult. Should not be removed from the wild.
It is estimated that there are <1000 plants of O. basicola scattered over three populations. Although the plants produce copious quantities of seed, and seedlings are commonly seen, adult plants tend of die after flowering. Of the three populations, Awahokomo is the most seriously threatened through displacement by introduced weeds. At the other two ultramafic habitats weeds are less of an issue, however, the populations at both sites are considered very small.
chaerophyllum: From the Greek chairo ‘to please’ and phyllon ‘leaf’
Where To Buy
Not commercially available
Fact Sheet Prepared by P.J. de Lange (1 November 2009). Description based on Heenan & Molloy (2006 - as Oreomyrrhis basicola) - see also de Lange et al (2010).
References and further reading
de Lange, P.J.; Heenan, P.B.; Norton, D.A.; Rolfe, J.R.; Sawyer, J.W.D. 2010: Threatened Plants of New Zealand. Canterbury University Press, Christchurch.
Heenan, P.B.; Molloy, B.P.J. 2006: A new species of Oreomyrrhis (Apiaceae) from southern South Island, New Zealand, and comparison of its limestone and ultramafic habitats. New Zealand Journal of Botany 44(1): 99-106.
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): Chaerophyllum basicola Fact Sheet (content continuously updated). New Zealand Plant Conservation Network. https://www.nzpcn.org.nz/flora/species/chaerophyllum-basicola/ (Date website was queried)