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  4. Salix cinerea

Salix cinerea

Salix cinerea.<br>Photographer: Nicholas J. D. Singers, Licence: All rights reserved.
Salix cinerea at Otumangakau.<br>Photographer: Nicholas J. D. Singers, Licence: All rights reserved.
Salix cinerea at Waipakihi.<br>Photographer: Nicholas J. D. Singers, Licence: All rights reserved.
Salix cinerea.<br>Photographer: John Barkla, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>.
Salix cinerea.<br>Photographer: John Smith-Dodsworth, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by-nc/4.0'>CC BY-NC</a>.
Salix cinerea.<br>Photographer: John Smith-Dodsworth, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by-nc/4.0'>CC BY-NC</a>.
Salix cinerea at Rangipo.<br>Photographer: Nicholas J. D. Singers, Licence: All rights reserved.
Salix cinerea.<br>Photographer: John Smith-Dodsworth, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by-nc/4.0'>CC BY-NC</a>.
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Common name

grey willow, pussy willow

Family

Salicaceae

Authority

Salix cinerea L.

Flora category

Vascular – Exotic

Structural class

Trees & Shrubs - Dicotyledons

NVS code

The National Vegetation Survey (NVS) Databank is a physical archive and electronic databank containing records of over 94,000 vegetation survey plots - including data from over 19,000 permanent plots. NVS maintains a standard set of species code abbreviations that correspond to standard scientific plant names from the Ngä Tipu o Aotearoa - New Zealand Plants database.

SALCIN

Conservation status

Not applicable

Brief description

Deciduous shrub or small tree up to 7 m tall, many branched forming dense thickets with grey or green-grey bark, leaves up to 7 x 3.5 cm, pale green on upper surface, grey below, flowers of two types produced in spring before the leaves on separate plants, the males being silky hairy catkins, often yellow due to pollen production, the female catkins being longer and silvery green.

Distribution

Widespread and locally abundant throughout both islands but rare in the Far North, South Westland and Southland

Habitat

Swamps, fens, water body margins and disturbed places.

Wetland plant indicator status rating

Information derived from the revised national wetland plant list prepared to assist councils in delineating and monitoring wetlands (Clarkson et al., 2021 Manaaki Whenua – Landcare Research Contract Report LC3975 for Hawke’s Bay Regional Council). The national plant list categorises plants by the extent to which they are found in wetlands and not ‘drylands’. The indicator status ratings are OBL (obligate wetland), FACW (facultative wetland), FAC (facultative), FACU (facultative upland), and UPL (obligate upland).

FACW: Facultative Wetland

Usually is a hydrophyte but occasionally found in uplands (non-wetlands).

Features

Shrub or small tree to approx. 7m high, often only 1~2m, spreading or often forming dense thickets; bark rather smooth. Shoots not brittle; grey or greenish-grey and remaining hairy, or reddish to dark purple and often becoming glabrous or glabrate, generally with pale brown markings and striations prominent below surface for around 2 years. Buds reddish, glabrate or hairy. Petiole to about 1cm long on adult shoots, but often very short and hairy. Lamina 2~7 x 1.5~3.5cm, often smaller at base of lateral shoots, generally obovate, sometimes elliptic, not bitter to taste; grey or glaucous below, generally densely clothed in soft grey hairs, sometimes rather sparsely clothed in harsher reddish-brown hairs, soon glabrous and shining above except for midrib, glandular-serrulate to subentire; angle between midrib and veins > 45¦; apex rounded to cuspidate. Stipules semi-annular, small, persisting on strong vegetative shoots. Catkins appearing before leaves, 1.5~3.5cm long, broad-cylindric to clindric-ovate, generally erect; rachis villous. Bracts 1.5~3mm long, elliptic to oblong-obovate, black in upper half, sericeous; apex obtuse to rounded. Gland .5~.8mm long, rectangular to almost square. Stamens 2; filaments pilose towards base. Female flowers with pedicels > bracts; ovary white-tomentose, stalked.

Manaaki Whenua Online Interactive Key

Key to willow species and hybrids present in New Zealand

Similar taxa

Leaves are broader then most other common willows, the combination of obovate leaf shape and grey-hairy undersides should distinguish this from all other willows.

Flowering

September to October

Flower colours

Green, Yellow

Fruiting

October to November

Life cycle

Perennial. shrub. Seed dispersed by wind, water and contaminated machinery.

Year naturalised

1925

Origin

Europe, West Asia and North Africa

Reason for introduction

Ornamental shrub

Control techniques

Can be controlled manually, mechanically or herbicidally depending on situation.

Etymology

cinerea: Ash-grey

National Pest Plant Accord species

This plant is listed in the 2020 National Pest Plant Accord. The National Pest Plant Accord (NPPA) is an agreement to prevent the sale and/or distribution of specified pest plants where either formal or casual horticultural trade is the most significant way of spreading the plant in New Zealand. For up to date information and an electronic copy of the 2020 Pest Plant Accord manual (including plant information and images) visit the MPI website.

Attribution

Factsheet prepared by Paul Champion and Deborah Hofstra (NIWA). Features description from Webb et. al. (1988).

References and further reading

Webb, C.J.; Sykes, W.R.; Garnock-Jones, P.J. (1988). Flora of New Zealand Volume 4: Naturalised pteridophytes, gymnosperms, dicotyledons. Botany Division, DSIR, Christchurch.

Popay et al (2010). An illustrated guide to common weeds of New Zealand, third edition. NZ Plant Protection Society Inc, 416pp.

Johnson PN, Brooke PA (1989). Wetland plants in New Zealand. DSIR Field Guide, DSIR Publishing, Wellington. 319pp.

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