An introduced pernicious and common weed mostly in S, also SE Ire; 2+ flowers in a head
Oxalis exilis . . . . Least Yellow-sorrel
Less common than Oxalis corniculatus, this has only 1 flower in a head, only 5 stamens with anthers and always green lvs
Oxalis pes-caprae . . . . Bermuda-buttercup
An uncommon weed of arable land in CI, Scilly and S
There are a number of Pink Sorrels, including the following: Annual Pink-sorrel (O. rosea), Large-fl Pink-sorrel (O. debilis) and Four-lved Pink-sorrel (O. tetraphylla) as well as the following:
Oxalis articulata . . . . Pink-sorrel
Leaves arise from thick horizontal scaly rhizomes (no obvious bulbs except for small ones at end of rhizomes); leaflets hairy with orange warts at margins; frequent in South England and CI
