Hello Stephen,
You have picked a suite of plants that most people don't bother about; The first five are from my own observations
Sonchus kirkii (Native puwha) Otago Peninsula not common; also near Riverton
Lepidium oleraceum (Cook’s Scurvy Grass/ nau) Aramoana, near Dunedin. (this is not common)
Taraxacum magellanicum (Native dandelion/tohetake), Fraser Basin, Old Man Range,
Cardamine debilis (NZ bittercress/panapana), Otago Peninsula common in forest remnants
Urtica incisa (Dwarf bush nettle / ongaonga), Otago Peninsula common in forest remnants( as is it big brother Urtica ferox)
Geranium solanderi (Matuakumara), You are in luck here: it has been recorded from Howells Point rocks, Riverton
Microseris scapigera (Native scorzonera) scattered locations South Island high country ( also in the North Island)
good luck