Pseudopanax K. Koch

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Credits

Article from Bean's Trees and Shrubs Hardy in the British Isles

Article from New Trees, Ross Bayton & John Grimshaw

Recommended citation
'Pseudopanax' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/pseudopanax/). Accessed 2019-12-12.

Family

  • Araliaceae

Common Names

  • Lancewoods

Glossary

calyx
(pl. calyces) Outer whorl of the perianth. Composed of several sepals.
ovary
Lowest part of the carpel containing the ovules; later developing into the fruit.
compound
Made up or consisting of two or more similar parts (e.g. a compound leaf is a leaf with several leaflets).
connate
Fused together with a similar part. (Cf. adnate.)
deflexed
Bent or turned downwards.
entire
With an unbroken margin.
included
(botanical) Contained within another part or organ.
leaflet
Leaf-like segment of a compound leaf.
panicle
A much-branched inflorescence. paniculate Having the form of a panicle.
raceme
Unbranched inflorescence with flowers produced laterally usually with a pedicel. racemose In form of raceme.
trifoliolate
With three leaflets.
valvate
(of similar parts of a plant: e.g. petals) Meeting without overlapping; (of dehiscent fruit) opening via valves.
vicariants
Similar usually related taxa found in similar habitat but in distant locations.

References

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Credits

Article from Bean's Trees and Shrubs Hardy in the British Isles

Article from New Trees, Ross Bayton & John Grimshaw

Recommended citation
'Pseudopanax' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/pseudopanax/). Accessed 2019-12-12.

Pseudopanax in its former sense included plants from New Zealand, Tasmania, New Caledonia and Chile, but with the transfer of some species to Neopanax, Polyscias Forster & Forster. f. and Raukaua Seem. it has been reduced to seven species, which are endemic to New Zealand and its adjacent islands (Frodin et al. 2003). The lancewoods are small to medium-sized trees or shrubs. The adult leaves are compound and palmate, though reduction in the number of leaflets occurs, and some species have one or three leaflets only. Heteroblasty, where different leaf-forms are produced in different age groups, is common in the genus (for example, P. crassifolius and P. ferox). The juvenile leaves are simple, linear, serrate and strongly reflexed. They encircle the trunk and are thought to have provided protection from herbivory by the now-extinct moas (Frodin et al. 2003). An array of intermediate leaf-forms can be found in wild specimens, and particularly on stump shoots and hybrids. Some species of Pseudopanax are grown almost entirely for their architectural juvenile leaves, but these are only produced for a limited period (10–20 years in P. crassifolius) before the development of adult leaves (Cave & Paddison 1999). Pseudopanax species are dioecious, with flowers in simple or compound umbels. The individual flowers are 5-merous and rather insignificant, and the fruit is fleshy (Allan 1961, Salmon 1996).

With the increasing popularity of impressive foliage plants, coinciding with a warming climate, Pseudopanax has come to the fore, and juvenile plants of P. crassifolius and P. ferox are now frequently to be found in nurseries and garden centres, at least in Britain. Their principal attraction is the juvenile foliage, which provides a very dramatic shape in the garden. It is noticeable, though, that the numbers of individuals offered are not matched by numbers of plants to be seen in gardens, and one has to suspect a fairly high mortality rate. As with many slightly marginal plants it is probably worth keeping them in a pot until they have developed somewhat in size and solidity. A warm, sheltered but sunny site in a mild climate seems to be the ideal. They can be propagated from seed, which is probably the best method for the relatives of P. crassifolius, or from cuttings in the case of the multistemmed shrubby species.

In addition to the two species described below, P. chathamicus Kirk, from the Chatham Islands and known in Maori as Hoho, is also offered commercially in the United Kingdom. It resembles P. crassifolius but the juvenile leaves are less strongly deflexed and more similar to those of the adult phase: a number of New Zealand plants have vicariants on the Chatham Islands in which protective adaptations, so common on the mainland, are moderated or absent – perhaps due to the absence of moas from these islands in the past (Atkinson & Greenwood 1989, Greenwood 1992).

Bean's Trees and Shrubs

Pseudopanax

A small genus of evergreen trees and shrubs, natives of New Zealand, Tasmania, New Caledonia, China, and Chile. Leaves digitately compound, trifoliolate or reduced to a single leaflet. Some New Zealand species go through a juvenile phase in which the leaves are markedly different from those of adult plants; the most notable instance – P. crassifolius – is treated below. Flowers in compound umbels, or in umbels arranged in the form of a panicle or raceme; pedicels jointed. Calyx entire or toothed. Petals five, valvate. Stamens five. Ovary with two to five locules. Styles two to five, more or less connate. Fruit fleshy, subglobose or compressed.

Pseudopanax, as here understood, includes species previously included in Nothopanax and Neopanax (see: W. R. Philipson, N.Z. Journ. Bot., Vol. III (1965), pp. 333-8; H. H. Allan, Fl. N.Z., Vol. I (1961), p. 433).

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