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Ripe seed and epimatium of wild plant in Mangotepopo shrubland, Tongariro Crossing [C.J. Earle, 2003.03.07].

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Foliage of wild plant in Mangotepopo shrubland [C.J. Earle, 2003.03.07].

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A shrub 15 cm tall and 20 cm across - old, for this species. On Mangotepopo shrubland [C.J. Earle, 2003.03.07].

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Plant about 20 cm across growing in cushion tundra, Tongariro Crossing, below North Crater [C.J. Earle, 2003.03.07].

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Stand of Lepidothamnus growing with Hebe, Tongariro Crossing [C.J. Earle, 2003.03.07].

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L. laxifolius: seed erect, ovoid, smooth, rounded, brown-black; micropyle sharply reflexed, distinct, epimatium thinly fleshy, pink-red; cone bracts swollen, fused, thickly fleshy, pink-red: cone 8 mm × 5 mm [J.H. Johns] (Molloy 1995).

 

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Conservation status 2010: protocol 2.3, needs updating

Lepidothamnus laxifolius

(Hook. f.) C.J. Quinn 1982

Common names

Mountain rimu, pigmy pine, pygmy pine.

Taxonomic notes

Syn: Dacrydium laxifolium Hooker f. 1845 (Quinn 1982). See Dacrydium for details. Type locality: Mount Tongariro (Allan 1961).

Description

A prostrate or sub-erect shrub with slender trailing branches c. 2-5 mm in diameter and up to 1 m or more long. Leaves of juvenile plants lax, spreading, narrow-linear, acute, flat, curved, 5-12 mm long, passing gradually into the adult leaves, which are linear-oblong, blunt or sub-acute, 1-2 mm long, appressed, imbricate, oblong-ovate, obtuse, keeled; scale-like. Branchlets often have a a mixture of leaf forms. Plants often monoecious. Pollen cones are solitary, terminal, sessile, up to 8 mm long, the apiculus broadly triangular, acute. Ovule solitary, terminal; receptacle swollen, crimson, succulent, rarely dry. Seed 3-5 mm. long, nutlike, oblong-cylindrical, obtuse, with stout, curved apiculus far exserted beyond epimatium. Aril red (Allan 1961, Dallimore et al. 1967).

Distribution and Ecology

New Zealand: N, S and Stewart Is. Montane and subalpine scrub and moorland from lat. 39° southwards; also lowland in Stewart Island (Allan 1961). Also occurs in alpine scrub, often as a trailing shrub on steep slopes (pers. obs., Tongariro National Park, 2003.03.07). Mean elevation for 123 collection sites was 682 m, with a mean annual temperature of 9.0°C and an average minimum in the coldest month of -0.5°C, and a mean annual precipitation of 3098 mm (Biffin et al. 2011, Table S5). Hardy to Zone 7 (cold hardiness limit between -17.7°C and -12.2°C) (Bannister and Neuner 2001).

Big tree

Oldest

Dendrochronology

Ethnobotany

Observations

I have seen it in New Zealand's Tongariro National Park. Some plants can be seen growing in alpine scrub in close association with Halocarpus bidwillii and Podocarpus nivalis and along both the east and north ends of the Tongariro Crossing, along the Silica Rapids and Taranaki Falls walks starting at Whakapapa Village on Mount Ruapehu.

Remarks

This is one of the smallest known conifers. Fruiting specimens barely 7.6 cm tall and wide have been found (Dallimore et al. 1967).

Citations

See also

The New Zealand Plant Conservation Network, accessed 2010.11.22.

Kirk, T. 1877. A revised Arrangement of the New Zealand Species of Dacrydium, with Descriptions of new Species. Transactions and Proceedings of the Royal Society of New Zealand 10:383-391 (as Dacrydium laxifolium; accessed 2011.03.27).

Last Modified 2013-03-27