Vascular – Exotic
Trees & Shrubs - Dicotyledons
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.
Terrestrial. High country slopes and screes.
Multi-stemmed shrub to about 2 m tending to layer. Broadly ovate leaves to about 7 x 6 cm with irregular serrate margins held on petioles of 1-2 cm. Male and female catkins borne separately, but on the same plant. Male catkins 3-6 cm long in clusters of up to 3 at shoot apicies. Female catkins in loose racemes of up to 6. Seed about 2 mm long, broadly ellipsoid and winged.
Can easily be distinguished from the Alnus glutinosa by the shrub form. May be some hybridisation with other less common shrubby alders.
Mountains C. & S. Europe.
alnus: From an old Latin name for alder
viridis: From the Latin viridis ‘green’
Reason For Introduction
Most reproduction appears to be vegetative, although seed is produced in abundance
Prolific seed produced
People, gravity, wind and water.
Can tolerate very cold and dry conditions. Can fix nitrogen via root nodules so can tolerate very low nutrient conditions.