Currently blooming in my garden are
Oxalis melano stricta (yellow)
Oxalis virginea (BX249, #27)
Oxalis sprialis aurea
Oxalis compressa (BX247, #1)
Oxalis hirta, from PBS in 2009
Shirley Meneice, not "elitist"
Coastal Central California
USDA Zone 9, but most years (4 out of 5) Zone 10