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In The Hills In The Hills 2019-11

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This article was first published in the Tararua Tramper Volume 91, # 10, November 2019

November in the hills with Chris Horne and Michele Dickson

Solanum laciniatum, poroporo, bullibulli

Poroporo.jpg: 722x949, 197k (2019 Nov 11 01:05)
Solanum laciniatum, poroporo, bullibulli
Photo: Jeremy Rolfe

Origin of the botanical name

Solanum, the Latin word for nightshade, refers to the comforting or narcotic effects of some members of the genus; laciniatum comes from the Latin word ‘lacinia’ meaning ‘fringed, cut into narrow lobes, slashed’. Poroporo is a member of the potato, tomato and tamarillo family, the Solanaceae.

Distribution and habitat

Poroporo is common on Te Ika a Māui/North Island from Auckland southwards and on Te Waipounamu/South Island as far south as Dunedin, on Rakiura/Stewart Island and Rekohu/ Chatham Island. Look for poroporo near the coast, in lowland forests and on forest margins. Poroporo is native to New Zealand. It also occurs in eastern Australia and New Guinea.

Growth habit

Poroporo is a soft-wooded, widely branching shrub or small tree about 3 m tall. The young stems are black or purplish. The leaves are alternate on the branches, thin, 15 cm-30 cm long or more, dark green, with one, two or three long, pointed lobes, or sometimes simply spear-shaped without lobes.

Reproduction

Poroporo flowers and fruits most of the year. The flowers are up to 5 cm diameter, bright purple. The petals have rounded ends and ruffled margins. The fruit are egg-shaped, 20 mm-25 mm long. They droop and ripen to yellowish. The seeds are 2.2 mm-2.5 mm long.

Uses

Māori used infusions of the leaves to combat itchy skin. Māori and the Pākehā settlers ate the fruit when the skins had split, but never before that because the fruits are very toxic. The settlers made jam from the fruit. Poroporo was grown until 1981 as a crop in Taranaki for producing hormonal steroids for birth control and pain-relief for rheumatoid arthritis. Several dyes for cloth have been produced from the branches and leaves.

Where can you find poroporo?

Look for poroporo in Ōtari-Wilton’s Bush, Centennial Reserve / Miramar Peninsula, other Wellington reserves, Lowry Bay Scenic Reserve and in the Remutaka Range. It colonises slips, clear-felled areas and private gardens, the seeds deposited there by birds.

A relative, S. aviculare, also called poroporo, has smaller, white or lavender flowers, up to 3.5 cm diameter. The petals have pointed ends. The stems are dark green. The species is described by DOC as ‘at risk – declining’.

Category
Botany 2019

In The Hills 2019-10 < Index chronological > In The Hills 2019-12

Page last modified on 2019 Nov 17 08:11

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