The New Zealand Plant Conservation Network

Species

Myriophyllum pedunculatum subsp. novae-zelandiae

Etymology

Myriophyllum: many leaves
pedunculatum: flowers stalked
novae-zelandiae: of New Zealand

Common Name(s)

None Known

Current Conservation Status

2012 - Not Threatened

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 - Not Threatened
2004 - Not Threatened

Authority

Myriophyllum pedunculatum subsp. novae-zelandiae Orchard

Family

Haloragaceae

Flora Category

Vascular - Native

NVS Species Code

MYRPED

Structural Class

Dicotyledonous Herbs other than Composites

Distribution

Endemic. New Zealand: North, South, Stewart, Chatham Islands

Features

Perennial mat-forming herb, aquatic to terrestrial, stems green, erect or prostrate, 20-100(-150) mm long, rooting at lower nodes, usually ± unbranched apart from rhizomatous portions at base. Leaves all entire, linear, 2-6 mm long, 0.5 mm wide, decussate, tip blunt to acute, sometimes almost acuminate, usually with a ± well defined midrib. Hydathodes 0-2. Inflorescence a terminal spike with the flowers borne singly in axils of the upper leaves which are indistinguishable from the other leaves. Each flower subtended by 2 bracteoles which are deltoid, 0.6-0.7(-1.3) × 0.2-0.3 mm, acuminate. Flowers unisexual, males and females often borne on separate stems, but if together, then males borne in upper axils, females below. Male flowers 4-merous, sessile or on pedicel up to 1 cm long. Sepals 4, oblanceolate, lanceolate to narrowly ovate or obovate, 0.9-1.4 × 0.3-0.5 mm, acute or obtuse, sometimes shortly mucronate, margins entire or minutely denticulate, Petals 4, red, hooded, weakly keeled, 1.3-1. 7(-2.5) × 0.8 mm, reflexed at anthesis. Stamens 8; filaments short, lengthening to 2.5 mm at anthesis; anthers linear-oblong, 0.9-1.1(-1.6) × 0.4 mm, 4-locular, shortly apiculate. Styles and ovary 0. Female flowers 4-merous, on pedicel 0.2-0.5(-1.0) mm long. Sepals 4, deltoid, 0.2 mm long, 0.2 mm wide. Petals 0. Stamens 0. Styles 4, alternating with sepals, 0.4 mm long, stigmas fimbriate, white, sometimes grading to pale pink. Ovary obpyriform, 0.6 × 0.5 mm, channelled opposite sepals, 4-locular. Fruit sessile or shortly pedunculate, red-purple, ovoid to obpyriform, 1.0-1.5 × 1.1-1.2 mm, deeply channelled opposite sepals, smooth to weakly striated, not verrucose; sepals usually persistent, membranous, 0.2 × 0.2 mm; styles persistent, becoming reflexed. Fruit splitting at maturity into 4 single-seeded mericarps. Mericarps ± globular with attenuate neck formed from persistent style.

Flower Colours

Red / Pink,White

Propagation Technique

Easily grown from fresh seed and rooted pieces. must be kept moist. An interesting plant for a small pond or fish tank

Threats

Not Threatened

Chromosome No.

2n = 28

Endemic Taxon

Yes

Endemic Genus

No

Endemic Family

No

This page last updated on 28 Mar 2015