african balance bermuda botanical botany buttercup cape english flora flower garden green nature oxalis peaceful purple sorrel sourgrass spring springtime summer weed wood-sorrel abundance African wood-sorrel Bermuda-buttercup Bermuda-sorrel buttercup-oxalis Cape-cowslip Cape-sorrel cotyledon English-weed goat's-foot groud-cover invasive noxious-weed oxalis-pes-caprae reflections soursob soursop trifoliate-leaves tristylous-flowering-plant weeds yellow-sorrel flowering flowers yellow abstract African-wood-sorrel background grass greenery ground-cover water