Oxalis corniculata L.  
Family: Oxalidaceae
creeping yellow wood-sorrel
[Oxalis corniculata var. atropurpurea L., Oxalis corniculata var. langloisii L., Oxalis corniculata var. lupulina L., Oxalis corniculata var. macrophylla L., Oxalis corniculata var. minor L., Oxalis corniculata var. reptans L., Oxalis corniculata var. villosa L., Oxalis corniculata var. viscidula L., Oxalis langloisii (Small) Fedde, Oxalis lupulina Kunth, Oxalis pusilla Salisb., Oxalis repens Thunb., Oxalis villosa M.Bieb., Xanthoxalis corniculata (L.) Small, Xanthoxalis corniculata var. atropurpurea (L.) Small, Xanthoxalis langloisii Small, Xanthoxalis repens (Thunb.) Moldenke]
Oxalis corniculata image
from USDA Plants website  
Etymology: Oxalis: from the Greek oxus for "sour," referring to the pleasantly sour taste of the leaves and stem
Plants: erect to drooping, perennial, up to 16" tall forb, hairy, creeping, weedy Leaves: 3-parted, alternate
Flowers: yellow, 5-parted, 1/3"-3/4" wide; inflorescence an umbel-like, un-branched cluster of stalked flowers from the leaf axils
Fruits: grayish, 1/2"-1" capsule on a spreading or slightly bent stalk; seeds brownish with white ridges
Oxalis corniculata image
Michael L. Charters  
Oxalis corniculata image
Paul Drobot  
Oxalis corniculata image
Paul Drobot  
Oxalis corniculata image
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