Pellitory of the wall, Asthma weed
Vascular – Exotic
Herbs - Dicotyledons other than Composites
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.
Grows in cracks in rocks and pathways and on walls (hence its name).
Perennial herb with spreading to erect stems up to 80 (occasionally up to 100) cm long. Stems are reddish to green. Leaves 1.5 – 9 cm long, lanceolate, ovate or rhombic, hairy on both surfaces, strongly veined; leaf stalk 1–1.5 cm long. Single seeded dry fruit (achene) maturing dark brown to black, hard, 1–1.2 mm long and 0.6–0.9 mm wide. It is distinguished by irregularly curled hairs on leaves and stems; axillary flower clusters along much of the stem; stigma on a long style.
It is commonly confused with Parietaria debilis (native to NZ) and Parietaria officinalis (naturalised in NZ) both of which are annuals having mostly ovate leaves and almost stalkless (sessile) stigmas.
S. and W. Europe, N. Africa to C. Asia
Spreads mainly by movement of seed, particularly when attached to animals, machinery and people. Some localised spread occurs by root pieces.