Species

Xeronema callistemon f. callistemon

Etymology

Xeronema: From the Greek xeros 'dry' and nema 'thread'
callistemon: with a beautiful stamen

Common Name(s)

Poor Knights Lily, Raupo-Taranga

Current Conservation Status

2012 - At Risk - Naturally Uncommon

Conservation status of New Zealand indigenous vascular plants, 2012
The conservation status of all known New Zealand vascular plant taxa at the rank of species and below were reassessed in 2012 using the New Zealand Threat Classification System (NZTCS). This report includes a statistical summary and brief notes on changes since 2009 and replaces all previous NZTCS lists for vascular plants. Authors: Peter J. de Lange, Jeremy R. Rolfe, Paul D. Champion, Shannel P. Courtney, Peter B. Heenan, John W. Barkla, Ewen K. Cameron, David A. Norton and Rodney A. Hitchmough. File size: 792KB

Previous Conservation Status

2009 - At Risk - Naturally Uncommon
2004 - Range Restricted

Qualifiers

2012 - CD, IE, RR
2009 - IE

Authority

Xeronema callistemon f. callistemon W.R.B.Oliv.

Family

Xeronemataceae

Flora Category

Vascular - Native

Structural Class

Monocotyledonous Herbs

Synonyms

Xeronema callistemon W.R.B.Oliv., Xeronema callistemon W.R.B.Oliv. var. callistemon

Distribution

Endemic. Only known from the Poor Knights Islands near Tutukaka, and from Hen (Taranga) Island,near Whangarei. Xeronema belongs to a newly established family of one genus with two species, the Xeronemataceae.

Habitat

Rhyolite sea cliffs and rock outcrops. Occasionally in forest on rubble or as an epiphyte on pohtukawa (Metrosideros excelsa). These latter occurrences probably stem from fallen plants captured in trees or resprouting on the forest floor.

Features

Forming huge colonies 1-4 m across. Leaves green to yellow-green, arising from thick rhizomes, and forming flattened fans, 60-150 x 3-5 cm, Dead leaves long persistent, ultimately detached from the frayed base to form a fibrous mass. Inflorescences on green, thick, leafy stems (peduncle) up to 1 m. Racemes 10-60 cm long, aligned vertically on upper side of peduncle. Flowers crowded, numerous. Flower stalks (pedicels) 1-15 mm long, subtended by an pale green translucent leafy bract, which is obviously shorter than the buds. Flowers red, tepals 10-15 mm, outer 3 mm wide, inner 1.5 mm. Stamen filaments twice length of tepals, anthers 4 mm long, pollen tangerine-orange. Ovary 4 x 2 mm, oblong-3-angled, covered with copious nectar. Capsule 9-11 mm. Seeds ovate, 1.6 x 1 mm, black.

Similar Taxa

None in New Zealand. Similar to X. moorei of New Caledonia (the only other species of the genus, and family), which differs in some floral and capsule details, and by the seed size and shape. X. callistemon f. callistemon differs from f. bracteosa only in one character, the much shorter pale green to translucent floral bracts, which are shorter than the emerging flower buds.

Flowering

September to December, peaking in October.

Flower Colours

Orange,Red / Pink

Fruiting

November to January.

Propagation Technique

Very easy from divisions of whole plants, and seed. But seed must be fresh, and though germinating easily can take 10-15 years to reach flowering size. Xeronema is best grown in a long narrow pot, within a free draining mix of rock chips and compost. Plants should be watered frequently, and frequently fertilised with sea weed, manure, or high phosphate/nitrogen garden fertilisers. They should be allowed to become root bound (or they will not flower), and need high sunlight. Plants are very cold sensitive, dying in even mild frosts.

Threats

None. The specie sis liste donly because it is endemic to two very small island archipelago.

Chromosome No.

2n = 34, 36

Endemic Taxon

Yes

Endemic Genus

No

Endemic Family

No

Where To Buy

Becoming more common in cultivation, and easily obtained from most garden centres.

References and further reading

Oliver, H. 1968. Note on the growing of Xeronema callistemon. Wellington Botanical Society Bulletin, 35: 22

This page last updated on 20 Jan 2014